A Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine
|
|
- Amber Carr
- 5 years ago
- Views:
Transcription
1 A Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine By: Ross Neal
2 Abstract: The efficiencies of sinusoidal and straight leading edge airfoils (NACA 0015) in a three straight wing Darrieus vertical axis wind turbine (VAWT) were compared using a fluid numerical solver (CFX). The airfoils and surrounding air modeled were meshed with body sizing and inflation layer methods and a cylinder mesh containing the surfaces of the airfoils was meshed separately as the mesh would be rotated during numerical solve. To save computing time, only a portion of the height of the VAWT was modeled as the streamlines should be repeating along the vertical leading edge of the airfoils. The numerical solver computed the torque applied to the rotated cylinder containing the airfoil surfaces at speeds from 15 to 35 rad/s for both designs at 10 m/s inlet wind speed of air with kg/m 3 density for 4 complete rotations. The resulting torques from the time series data were averaged and converted to units of power (W) and coefficient of power and were graphed over rotation speed and tip speed ratio respectively to compare both airfoil designs. Introduction: Now that gasoline prices have greatly decreased, it is becoming harder for green energy, such as wind energy, to compete for investments over cheap, traditional, and polluting power sources such as coal. Therefore, it is more important now more than ever to make green energy more attractive by making them more efficient at producing power. One such solution came from a company called Whale Power based in Toronto. The company used biomimetics to design more efficient airplane wings, vacuum pumps, hydroelectric turbines and horizontal wind turbines. The company believed that the unique shape of the tubercles on the leading edge of the pectoral fins of
3 humpback whales allowed the whales to swim more efficiently than having smooth on fins allowing the animal to swim with much less effort. In fact, there have been several papers, experiments, prototypes (shown in Figure 1), and even products (shown in Figure 2) demonstrating that the tubercle leading edge airfoils consistently outperform their leading edge smooth counterparts The tubercles on the leading edge of the airfoils combine the best of swept forward and backward wing designs to redirect streamlines into bands (shown on Figure 3) which reduces the turbulent vortices/cavitations and laminar flow separation that would normally cause stalls on traditional wings by increasing the angle of attack (the relative angle between the airspeed vector and the chord of the airfoil blade) shown in Figure 4. The stalling robustness of the tubercle airfoil allows for 1 Saadat, Haj Hariri, and Fish, Explanation of the Effects of Leading Edge Tubercles on the Aerodynamics of Airfoils and Finite Wings, The American Physical Society Division of Fluid Dynamics 21 Nov. 2010, < 2 Murray, Gruber, and Fredriksson, Effect of Leading Edge Tubercles on Marine Tidal Turbine Blades, The American Physical Society Division of Fluid Dynamics 22 Nov. 2010, < 3 Custodio, Henoch, and Johari, Separation Control on a Hydrofoil Using Leading Edge Protuberances, The American Physical Society Division of Fluid Dynamics 19 Nov. 2006, <
4 higher angles of attack of the airfoil without stalls or as much drag and therefore more lift is created due to increased fluid pressure under the airfoil (more cross sectional area of the airfoil is directly exposed to the fluid). This technology could be applied to airplane wings that could save on fuel due to less drag caused by the wings and to blades of wind/hydroelectric turbines that would generate more torque at lower fluid speeds leading to more power and electricity generated. However, most research involving this technology has been put into fan blades and airplane wings, but not in vertical axis wind turbines (VAWT) like the Darrieus design shown in Figure 5. Theoretically, if the modified tubercle airfoil increases the efficiency of lift for wings on airplanes and on fan blades, the same idea could be applied to vertical axis wind turbines. The tubercle technology would be especially advantageous for Darrieus VAWTs over more popular horizontal axis wind turbines (HAWT) because it can accentuate the advantages VAWTs have
5 over HAWTs; VAWTs can operate at especially low wind speeds and therefore at lower elevations and this technology would theoretically increase the power generated at those speeds significantly. Also, since not as much power is needed to rotate the tubercle VAWT, less starting electricity would be needed/wasted to start rotation of the VAWT (VAWTs are not self starting from standstill unlike HAWTs). Plus, since the wind speed is the same along the entire length of the airfoil on VAWTs unlike HAWTs, the tubercles size/shapes can be more easily optimized for the average wind speed experienced at a particular location leading to a relatively simpler shape to manufacture compared to HAWTs where the cross sectional airfoil shape has to be constantly optimized at different radial speeds experienced along the blade in addition to the tubercles. To validate the claims of increased efficiencies of the tubercle leading edge airfoils over traditional straight edge designs and to test if the technology would equally apply Darrieus VAWTs, I decided to numerically model and compute the power generated by tubercle and straight leading edge Darrieus VAWTs. Modeling: I decided to use a well understood simple popular airfoil for the VAWT as a National Advisory Committee for Aeronautics (NACA) 0015 airfoil show in Figure 6. The four digit number represent constants in the symmetrical four digit airfoil NACA equation:
6 where c is the chord length, x and y t are the normalized horizontal and vertical coordinates of the edge of the airfoil respectively, and t is the maximum thickness normalized to the fraction size of the chord length (last two digits of the NACA is 100*t). The overall design was three NACA 0015 equidistant airfoils around a circle of 1 m diameter with 20 cm chords (shown in Figure 7 with force vectors). The pitch angle Θ was chosen to be 10 o (close to the NACA 0015 stall angle shown in Figure 8 for a given Reynolds number calculated later) for both the tubercle and non tubercle airfoils so that I could directly compare both airfoils and accentuate the theoretical advantages of the low drag at higher angle of attack for the tubercle airfoil. The Reynolds number can be calculated for an airfoil (fluid
7 dynamics) as: Re=V*c/v where Re is the Reynolds number, V is the flight/wind speed, c is the chord length, and v is the kinematic viscosity of the fluid (air in this case). For a chosen 10 m/s wind speed, the Reynolds number ranges from around 120,000 to 140,000 for elevations between 1700 m and sea level respectively which means the magenta line in Figure 8 most closely matches the simulation. To model the tubercles on the leading edge of the airfoil, the following sinusoidal equation was used in Figure 9. To get a 3D model of a tubercle airfoil, the base NACA 0015 shape was vertically extruded with the sine wave as a leading edge guideline. Then, a second NACA 0015 shape was extruded normally (straight up vertically) and both 3D objects were intersected and joined to get a straight tailing edge and a sinusoidal leading edge shown in Figure 10. Then, three copies of the airfoil were arranged as previously shown in Figure 7 with the center of rotation inside a 8x3x0.3 m rectangular prism located 2 m from one end and centered
8 along the 3 m side. To reduce element count and facilitate meshing and to allow rotation of airfoils, two more cylinders were centered on axis of rotation of diameter 0.75 m and 1.5 m with height of 0.3 m as shown in Figure 11. The outer box and the innermost cylinder were meshed (using ANSYS software) with a body sizing method of 5 mm and a multi zone method with hexa/prism shapes with free mesh tetrahedrons while the outer cylinder minus the inner cylinder and the airfoils (airfoils aren t meshed) were meshed with a body sizing method of 2 mm shown in Figure 12. All the
9 interfaces between shapes/regions touching have 20 inflation layers at a 1.2 growth rate including the surface of the airfoils shown zoomed in on Figure 13. After meshing the model, a fluid dynamics numerical solver was used (CFX) to calculate the drag and lift forces on the airfoils. The boundary conditions were set up as shown in Figure 14. The inlet wind (air at 25 o C with kg/m 3 density which is about 350 m of elevation above
10 sea level) conditions is set to 10 m/s at 5% intensity to simulate a median wind speed. The red symmetry boundaries allow for the VAWT to be taller if need be since the airflow should be roughly the same at any height along the airfoil. In order to get a power curve data to properly calculate torque generated by airfoils, the wind speed in the inlet remained the same 10 m/s, while the rotational speed of the airfoils varied between 15 and 35 rad/s in 5 rad/s increments (the entire cylinder mesh region was rotated about the big blue arrow in Figure 14 to rotate the airfoil surfaces). To balance accurate results and be computationally shorter, 400 timesteps and 100 maximum loops per timestep at.0001 variance (100 per revolution or approximately 3 o rotation increments) for each simulation was chosen. Therefore, the entire simulation length was calculated by 4*2π*(rad/s) for 4 revolutions and the time step (dt) is 1/400 the entire simulation length which values are shown on Figure 15. Since the Darrieus VAWT blades were strictly vertical and not a twisted helical blades (twisted helical blades would have required more height of the airfoil to be calculated whereas the simulations took a full month of computer time already), the torque applied to the airfoil varies over time as each of the three airfoil go from the optimum angle (leading edge of the
11 airfoil is close to facing directly the wind speed vector) to generate the most useful lift at different time throughout the rotation cycle. Therefore, in order to compare the efficiencies of both smooth and tubercle airfoils in Darrieus VAWTs, the torque applied to the blades (the rotating cylinder) had to be averaged over the entire simulation time (shown as an example in Figure 16). The first revolution of torque data on the airfoils had to be discarded due to the time it takes for the streamlines of the wind of the inlet to fully penetrate the entire VAWT simulation. Results: The results were very encouraging as the tubercle leading edge airfoil VAWT consistently and significantly outperformed the smooth leading edge airfoil VAWT in average torque and power generated; the minimum improvement of power generated by the tubercle was just under twice (up to a maximum of 6 times more) than that over the traditional design. The average power generated was calculated by multiplying the rotational speed to the average torque generated. The coefficient of power was also calculated by the following equation: where Cp is the coefficient of power, P is the power generated (W) calculated from the torque, p is the density of the fluid (air at kg/m 3 ), A is the area swept by the airfoils (0.3 m height with 1 m diameter makes 0.3 m 2 area swept), and V is the velocity of the fluid (air at 10
12 m/s). The tip speed ratio (TSR) was calculated from multiplying the rotation speed (rad/s) and the radius of the rotation (0.5 m) divided by wind speed (10 m/s). All the calculated averages of generated torques, powers, coefficients of power as well as the percent improvement of the tubercle over normal airfoil designs are shown in Figure 17 and was entered in two separate graphs with different units yet show the same percentage improvements shown in Figure 18.
13 The Tubercle airfoil generates some incredible efficiencies approaching a coefficient of power greater than 0.6 or maybe 0.7 for higher TSRs whereas the normal airfoil has a localized stall at 25 rad/s (TSR of 1.25) and the coefficient of power may be plateauing between 0.3 and 0.4 for TSRs higher than Conclusion: Given more computational power and resources, a more complete coefficient of power versus TSR graph could be made to show optimum TSR for coefficient of power. In addition, a more complex helical airfoils could be introduced to mitigate varying torques generate over each cycle of rotation which could also reduce mechanical stresses and failures due to reduced vibrations. Plus, a scaled down experiment could be made in a wind tunnel to see how well the numerical simulation matches experimentation. Also, a separate study could be completed on just the on the equation for the leading edge tubercle airfoil (NACA shape airfoil and pitch could be also be optimized for tubercle technology) to see if varying the amplitude and frequency could be optimized for certain wind speeds since there hasn t been much research on that particular subject matter. The added efficiencies of adding a simple sinusoidal leading edge airfoil were found to be between 2 6 times for efficient compared to the traditional straight edged airfoils in a Darrieus VAWT. The relative stalling robustness of the tubercle airfoil over the traditional straight edged airfoil allowed for greater percentage of the rotation cycle to have useable lift and increase overall efficiency. The sheer efficiency improvement should be more than enough to justify any additional manufacturing costs of the propellers especially with the relatively smaller blades Darrieus VAWTs typically have compare to modern giant HAWTs.
C-1: Aerodynamics of Airfoils 1 C-2: Aerodynamics of Airfoils 2 C-3: Panel Methods C-4: Thin Airfoil Theory
ROAD MAP... AE301 Aerodynamics I UNIT C: 2-D Airfoils C-1: Aerodynamics of Airfoils 1 C-2: Aerodynamics of Airfoils 2 C-3: Panel Methods C-4: Thin Airfoil Theory AE301 Aerodynamics I : List of Subjects
More informationCIRCULATION CONTROLLED AIRFOIL ANALYSIS THROUGH 360 DEGREES ANGLE OF ATTACK
Proceedings of the ASME 2009 3rd International Conference of Proceedings Energy Sustainability of ES2009 Energy Sustainability ES2009 July July 19-23, 2009, 2009, San San Francisco, California, USA ES2009-90341
More informationModulation of Vertical Axis Wind Turbine
Modulation of Vertical Axis Wind Turbine Apurwa Gokhale 1, Nehali Gosavi 2, Gurpreet Chhabda 3, Vikrant Ghadge 4, Dr. A.P.Kulkarni 5 1,2,3,4 Vishwakarma Institute of Information Technology, Pune. 5 Professor,
More informationANALYSIS OF AERODYNAMIC CHARACTERISTICS OF A SUPERCRITICAL AIRFOIL FOR LOW SPEED AIRCRAFT
ANALYSIS OF AERODYNAMIC CHARACTERISTICS OF A SUPERCRITICAL AIRFOIL FOR LOW SPEED AIRCRAFT P.Sethunathan 1, M.Niventhran 2, V.Siva 2, R.Sadhan Kumar 2 1 Asst.Professor, Department of Aeronautical Engineering,
More informationInvestigation on 3-D Wing of commercial Aeroplane with Aerofoil NACA 2415 Using CFD Fluent
Investigation on 3-D of commercial Aeroplane with Aerofoil NACA 2415 Using CFD Fluent Rohit Jain 1, Mr. Sandeep Jain 2, Mr. Lokesh Bajpai 3 1PG Student, 2 Associate Professor, 3 Professor & Head 1 2 3
More informationAerodynamic Analyses of Horizontal Axis Wind Turbine By Different Blade Airfoil Using Computer Program
ISSN : 2250-3021 Aerodynamic Analyses of Horizontal Axis Wind Turbine By Different Blade Airfoil Using Computer Program ARVIND SINGH RATHORE 1, SIRAJ AHMED 2 1 (Department of Mechanical Engineering Maulana
More informationNumerical Investigation of Multi Airfoil Effect on Performance Increase of Wind Turbine
International Journal of Engineering & Applied Sciences (IJEAS) International Journal of Engineering Applied Sciences (IJEAS) Vol.9, Issue 3 (2017) 75-86 Vol.x, Issue x(201x)x-xx http://dx.doi.org/10.24107/ijeas.332075
More informationCFD Analysis ofwind Turbine Airfoil at Various Angles of Attack
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 13, Issue 4 Ver. II (Jul. - Aug. 2016), PP 18-24 www.iosrjournals.org CFD Analysis ofwind Turbine
More informationInternational Journal of Innovative Research in Science, Engineering and Technology Vol. 2, Issue 5, May 2013
PERFORMANCE PREDICTION OF HORIZONTAL AXIS WIND TURBINE BLADE HardikPatel 1, SanatDamania 2 Master of Engineering Student, Department of Mechanical Engineering, Government Engineering College, Valsad, Gujarat,
More informationResearch on Small Wind Power System Based on H-type Vertical Wind Turbine Rong-Qiang GUAN a, Jing YU b
06 International Conference on Mechanics Design, Manufacturing and Automation (MDM 06) ISBN: 978--60595-354-0 Research on Small Wind Power System Based on H-type Vertical Wind Turbine Rong-Qiang GUAN a,
More informationAERODYNAMIC CHARACTERISTICS OF NACA 0012 AIRFOIL SECTION AT DIFFERENT ANGLES OF ATTACK
AERODYNAMIC CHARACTERISTICS OF NACA 0012 AIRFOIL SECTION AT DIFFERENT ANGLES OF ATTACK SUPREETH NARASIMHAMURTHY GRADUATE STUDENT 1327291 Table of Contents 1) Introduction...1 2) Methodology.3 3) Results...5
More informationEXPERIMENTAL ANALYSIS OF FLOW OVER SYMMETRICAL AEROFOIL Mayank Pawar 1, Zankhan Sonara 2 1,2
EXPERIMENTAL ANALYSIS OF FLOW OVER SYMMETRICAL AEROFOIL Mayank Pawar 1, Zankhan Sonara 2 1,2 Assistant Professor,Chandubhai S. Patel Institute of Technology, CHARUSAT, Changa, Gujarat, India Abstract The
More informationCFD Analysis of Giromill Type Vertical Axis Wind Turbine
242 CFD Analysis Giromill Type Vertical Axis Wind Turbine K. Sainath 1, T. Ravi 2, Suresh Akella 3, P. Madhu Sudhan 4 1 Associate Pressor, Department Mechanical Engineering, Sreyas Inst. Engg. & Tech.,
More informationVertical Wind Energy Engineering Design and Evaluation of a Twisted Savonius Wind Turbine
Design and Evaluation of a Twisted Savonius Wind Turbine Ian Duffett Jeff Perry Blaine Stockwood Jeremy Wiseman Outline Problem Definition Introduction Concept Selection Design Fabrication Testing Results
More informationTHEORY OF WINGS AND WIND TUNNEL TESTING OF A NACA 2415 AIRFOIL. By Mehrdad Ghods
THEORY OF WINGS AND WIND TUNNEL TESTING OF A NACA 2415 AIRFOIL By Mehrdad Ghods Technical Communication for Engineers The University of British Columbia July 23, 2001 ABSTRACT Theory of Wings and Wind
More informationCOMPUTATIONAL FLUID DYNAMIC ANALYSIS OF AIRFOIL NACA0015
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 2, February 2017, pp. 210 219 Article ID: IJMET_08_02_026 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=2
More informationEvaluation of aerodynamic criteria in the design of a small wind turbine with the lifting line model
Evaluation of aerodynamic criteria in the design of a small wind turbine with the lifting line model Nicolas BRUMIOUL Abstract This thesis deals with the optimization of the aerodynamic design of a small
More informationAerodynamic Performance Optimization Of Wind Turbine Blade By Using High Lifting Device
Aerodynamic Performance Optimization Of Wind Turbine Blade By Using High Lifting Device Razeen Ridhwan, Mohamed Alshaleeh, Arunvinthan S Abstract: In the Aerodynamic performance of wind turbine blade by
More informationLow Speed Wind Tunnel Wing Performance
Low Speed Wind Tunnel Wing Performance ARO 101L Introduction to Aeronautics Section 01 Group 13 20 November 2015 Aerospace Engineering Department California Polytechnic University, Pomona Team Leader:
More informationComputational Analysis of Cavity Effect over Aircraft Wing
World Engineering & Applied Sciences Journal 8 (): 104-110, 017 ISSN 079-04 IDOSI Publications, 017 DOI: 10.589/idosi.weasj.017.104.110 Computational Analysis of Cavity Effect over Aircraft Wing 1 P. Booma
More informationWind Energy Technology. What works & what doesn t
Wind Energy Technology What works & what doesn t Orientation Turbines can be categorized into two overarching classes based on the orientation of the rotor Vertical Axis Horizontal Axis Vertical Axis Turbines
More informationNumerical Study of Giromill-Type Wind Turbines with Symmetrical and Non-symmetrical Airfoils
European International Journal of Science and Technology Vol. 2 No. 8 October 2013 Numerical Study of Giromill-Type Wind Turbines with Symmetrical and Non-symmetrical Airfoils Prathamesh Deshpande and
More informationNo Description Direction Source 1. Thrust
AERODYNAMICS FORCES 1. WORKING TOGETHER Actually Lift Force is not the only force working on the aircraft, during aircraft moving through the air. There are several aerodynamics forces working together
More information2-D Computational Analysis of a Vertical Axis Wind Turbine Airfoil
2-D Computational Analysis of a Vertical Axis Wind Turbine Airfoil Akshay Basavaraj1 Student, Department of Aerospace Engineering, Amrita School of Engineering, Coimbatore 641 112, India1 Abstract: This
More informationFlight Corridor. The speed-altitude band where flight sustained by aerodynamic forces is technically possible is called the flight corridor.
Flight Corridor The speed-altitude band where flight sustained by aerodynamic forces is technically possible is called the flight corridor. The subsonic Boeing 747 and supersonic Concorde have flight corridors
More informationCFD Study of Solid Wind Tunnel Wall Effects on Wing Characteristics
Indian Journal of Science and Technology, Vol 9(45), DOI :10.17485/ijst/2016/v9i45/104585, December 2016 ISSN (Print) : 0974-6846 ISSN (Online) : 0974-5645 CFD Study of Solid Wind Tunnel Wall Effects on
More informationSenior mechanical energy conversion trends
Senior mechanical energy conversion trends Introduction and Analysis to fan blade profile and CFD Simulation Of An Appropriate Blade Profile for improving energy efficiency HAMED ROSTAMALIZADEH 95742906
More informationReduction of Skin Friction Drag in Wings by Employing Riblets
Reduction of Skin Friction Drag in Wings by Employing Riblets Kousik Kumaar. R 1 Assistant Professor Department of Aeronautical Engineering Nehru Institute of Engineering and Technology Coimbatore, India
More informationAE Dept., KFUPM. Dr. Abdullah M. Al-Garni. Fuel Economy. Emissions Maximum Speed Acceleration Directional Stability Stability.
Aerodynamics: Introduction Aerodynamics deals with the motion of objects in air. These objects can be airplanes, missiles or road vehicles. The Table below summarizes the aspects of vehicle performance
More informationNumerical Simulation And Aerodynamic Performance Comparison Between Seagull Aerofoil and NACA 4412 Aerofoil under Low-Reynolds 1
Advances in Natural Science Vol. 3, No. 2, 2010, pp. 244-20 www.cscanada.net ISSN 171-7862 [PRINT] ISSN 171-7870 [ONLINE] www.cscanada.org *The 3rd International Conference of Bionic Engineering* Numerical
More informationThe Influence of Blade Camber on the Performance of a Vertical Axis Wind Turbine in Fluctuating Wind
, June 29 - July 1, 2016, London, U.K. The Influence of Blade Camber on the Performance of a Vertical Axis Wind Turbine in Fluctuating Wind Michael D. Bausas, and Louis Angelo M. Danao, Member, IAENG Abstract
More informationDynamic Stall For A Vertical Axis Wind Turbine In A Two-Dimensional Study
Abstracts of Conference Papers: TSBE EngD Conference, TSBE Centre, University of Reading, Whiteknights, RG6 Dynamic Stall For A Vertical Axis Wind Turbine In A Two-Dimensional Study R. Nobile 1,*, Dr M.
More informationCFD ANALYSIS OF FLOW AROUND AEROFOIL FOR DIFFERENT ANGLE OF ATTACKS
www.mechieprojects.com CFD ANALYSIS OF FLOW AROUND AEROFOIL FOR DIFFERENT ANGLE OF ATTACKS PRESENTATION OUTLINE AIM INTRODUCTION LITERATURE SURVEY CFD ANALYSIS OF AEROFOIL RESULTS CONCLUSIONS www.mechieprojects.com
More informationCFD ANALYSIS OF AIRFOIL SECTIONS
CFD ANALYSIS OF AIRFOIL SECTIONS Vinayak Chumbre 1, T. Rushikesh 2, Sagar Umatar 3, Shirish M. Kerur 4 1,2,3 Student, Jain College of Engineering, Belagavi, Karnataka, INDIA 4Professor, Dept. of Mechanical
More informationAerodynamic Analysis of a Symmetric Aerofoil
214 IJEDR Volume 2, Issue 4 ISSN: 2321-9939 Aerodynamic Analysis of a Symmetric Aerofoil Narayan U Rathod Department of Mechanical Engineering, BMS college of Engineering, Bangalore, India Abstract - The
More informationModel tests of wind turbine with a vertical axis of rotation type Lenz 2
Model tests of wind turbine with a vertical axis of rotation type Lenz 2 Jaroslaw Zwierzchowski 1,*, Pawel Andrzej Laski 1, Slawomir Blasiak 1, Jakub Emanuel Takosoglu 1, Dawid Sebastian Pietrala 1, Gabriel
More informationCFD SIMULATION STUDY OF AIR FLOW AROUND THE AIRFOIL USING THE MAGNUS EFFECT
Magnus effect, simulation, air flow Patryk SOKOŁOWSKI *, Jacek CZARNIGOWSKI **, Paweł MAGRYTA *** CFD SIMULATION STUDY OF AIR FLOW AROUND THE AIRFOIL USING THE MAGNUS EFFECT Abstract The article presents
More informationIncreasing the power output of the Darrieus Vertical Axis Wind Turbine
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36. Increasing the power output of the Darrieus Vertical Axis Wind Turbine R. Ramkissoon 1 and K. Manohar
More informationDevelopment process of a vertical axis wind turbine
7th World Summit for Small Wind (WSSW2016) / Technology Development Development process of a vertical axis wind turbine Daniel Lehser-Pfeffermann Wind energy lab, htw saar Germany Day 2 18.03.2016 7th
More informationAerodynamically Efficient Wind Turbine Blade S Arunvinthan 1, Niladri Shekhar Das 2, E Giriprasad 3 (Avionics, AISST- Amity University, India)
International Journal of Engineering Science Invention ISSN (Online): 2319 6734, ISSN (Print): 2319 6726 Volume 3 Issue 4ǁ April 2014ǁ PP.49-54 Aerodynamically Efficient Wind Turbine Blade S Arunvinthan
More informationThe Usage of Propeller Tunnels For Higher Efficiency and Lower Vibration. M. Burak Şamşul
The Usage of Propeller Tunnels For Higher Efficiency and Lower Vibration M. Burak Şamşul ITU AYOC 2014 - Milper Pervane Teknolojileri Company Profile MILPER is established in 2011 as a Research and Development
More informationSTUDY OF VARIOUS NACA SERIES AEROFOIL SECTIONS AND WING CONTOUR GENERATION USING CATIA V5
STUDY OF VARIOUS NACA SERIES AEROFOIL SECTIONS AND WING CONTOUR GENERATION USING CATIA V5 Pawan Kumar Department of Aeronautical Engineering, Desh Bhagat University, Punjab, India ABSTRACT Aerofoil is
More informationEfficiency Improvement of a New Vertical Axis Wind Turbine by Individual Active Control of Blade Motion
Efficiency Improvement of a New Vertical Axis Wind Turbine by Individual Active Control of Blade Motion In Seong Hwang, Seung Yong Min, In Oh Jeong, Yun Han Lee and Seung Jo Kim* School of Mechanical &
More informationAerodynamics of a wind turbine
Aerodynamics of a wind turbine Author: Kosmacheva Anna Supervisor: Jari Hämäläinen Lappeenranta University of Technology Technomatematics Introduction Wind turbine is a device that converts kinetic energy
More informationKeywords: dynamic stall, free stream turbulence, pitching airfoil
Applied Mechanics and Materials Vol. 225 (2012) pp 103-108 Online available since 2012/Nov/29 at www.scientific.net (2012) Trans Tech Publications, Switzerland doi:10.4028/www.scientific.net/amm.225.103
More informationThe effect of back spin on a table tennis ball moving in a viscous fluid.
How can planes fly? The phenomenon of lift can be produced in an ideal (non-viscous) fluid by the addition of a free vortex (circulation) around a cylinder in a rectilinear flow stream. This is known as
More informationCOMPUTER-AIDED DESIGN AND PERFORMANCE ANALYSIS OF HAWT BLADES
5 th International Advanced Technologies Symposium (IATS 09), May 13-15, 2009, Karabuk, Turkey COMPUTER-AIDED DESIGN AND PERFORMANCE ANALYSIS OF HAWT BLADES Emrah KULUNK a, * and Nadir YILMAZ b a, * New
More informationExperimental Investigation of End Plate Effects on the Vertical Axis Wind Turbine Airfoil Blade
Experimental Investigation of End Plate Effects on the Vertical Axis Wind Turbine Airfoil Blade Rikhi Ramkissoon 1, Krishpersad Manohar 2 Ph.D. Candidate, Department of Mechanical and Manufacturing Engineering,
More informationThe water supply for a hydroelectric plant is a reservoir with a large surface area. An outlet pipe takes the water to a turbine.
Fluids 1a. [1 mark] The water supply for a hydroelectric plant is a reservoir with a large surface area. An outlet pipe takes the water to a turbine. State the difference in terms of the velocity of the
More informationBasic Fluid Mechanics
Basic Fluid Mechanics Chapter 7B: Forces on Submerged Bodies 7/26/2018 C7B: Forces on Submerged Bodies 1 Forces on Submerged Bodies Lift and Drag are forces exerted on an immersed body by the surrounding
More informationExperimental and Theoretical Investigation for the Improvement of the Aerodynamic Characteristic of NACA 0012 airfoil
International Journal of Mining, Metallurgy & Mechanical Engineering (IJMMME) Volume 2, Issue 1 (214) ISSN 232 46 (Online) Experimental and Theoretical Investigation for the Improvement of the Aerodynamic
More informationFABRICATION OF VERTICAL AXIS WIND TURBINE WITH WIND REDUCER AND EXPERIMENTAL INVESTIGATIONS
87 CHAPTER-4 FABRICATION OF VERTICAL AXIS WIND TURBINE WITH WIND REDUCER AND EXPERIMENTAL INVESTIGATIONS 88 CHAPTER-4 FABRICATION OF VERTICAL AXIS WIND TURBINE WITH WIND REDUCER AND EXPERIMENTAL INVESTIGATIONS
More informationSimulation of flow over double-element airfoil and wind tunnel test for use in vertical axis wind
Home Search Collections Journals About Contact us My IOPscience Simulation of flow over double-element airfoil and wind tunnel test for use in vertical axis wind turbine This content has been downloaded
More informationCFD ANALYSIS AND COMPARISON USING ANSYS AND STAR-CCM+ OF MODEL AEROFOIL SELIG 1223
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 11, November 2017, pp. 312 318, Article ID: IJMET_08_11_034 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=11
More informationJ. Szantyr Lecture No. 21 Aerodynamics of the lifting foils Lifting foils are important parts of many products of contemporary technology.
J. Szantyr Lecture No. 21 Aerodynamics of the lifting foils Lifting foils are important parts of many products of contemporary technology. < Helicopters Aircraft Gliders Sails > < Keels and rudders Hydrofoils
More informationSmall Scale Wind Technologies Part 2. Centre for Renewable Energy at Dundalk IT CREDIT
Small Scale Wind Technologies Part 2 Centre for Renewable Energy at Dundalk IT CREDIT 1 Part 2 Small and large scale wind turbine technologies 2 Overview of small scale grid connected system Wind Turbine
More informationCentre for Offshore Renewable Energy Engineering, School of Energy, Environment and Agrifood, Cranfield University, Cranfield, MK43 0AL, UK 2
Fluid Structure Interaction Modelling of A Novel 10MW Vertical-Axis Wind Turbine Rotor Based on Computational Fluid Dynamics and Finite Element Analysis Lin Wang 1*, Athanasios Kolios 1, Pierre-Luc Delafin
More informationComputational Analysis of the S Airfoil Aerodynamic Performance
Computational Analysis of the 245-3S Airfoil Aerodynamic Performance Luis Velazquez-Araque and Jiří Nožička 2 Department of Mechanical Engineering National University of Táchira, San Cristóbal 5, Venezuela
More informationEffect of Blade Design on Angular Velocity of Vertical Axis Wind Turbine CFD Analysis
Journal of Informatics and Mathematical Sciences Vol. 10, Nos. 1 & 2, pp. 279 285, 2018 ISSN 0975-5748 (online); 0974-875X (print) Published by RGN Publications http://www.rgnpublications.com http://dx.doi.org/10.26713/jims.v10i1-2.1053
More informationBLADE DESIGN FOR WINDMILL GENERATOR MUHAMMMAD FITRI BIN MOHAMED HASSAN
BLADE DESIGN FOR WINDMILL GENERATOR MUHAMMMAD FITRI BIN MOHAMED HASSAN Report submitted in partial fulfillment of the requirements for the award of Bachelor of Mechatronics Engineering Faculty of Manufacturing
More informationComputational studies on small wind turbine performance characteristics
Journal of Physics: Conference Series PAPER OPEN ACCESS Computational studies on small wind turbine performance characteristics To cite this article: N Karthikeyan and T Suthakar 2016 J. Phys.: Conf. Ser.
More informationThis is the author s final accepted version.
Ibrahim, I.H., Joy, J. and New, T.N. (2016) Numerical Investigation on Flow Separation Control of Low Reynolds Number Sinusoidal Aerofoils. In: 46th AIAA Fluid Dynamics Conference, AIAA AVIATION Forum,
More informationROTORS for WIND POWER
ROTORS for WIND POWER P.T. Smulders Wind Energy Group Faculty of Physics University of Technology, Eindhoven ARRAKIS 1 st edition October 1991 revised edition January 2004 CONTENTS ROTORS for WIND POWER...
More informationExternal Tank- Drag Reduction Methods and Flow Analysis
External Tank- Drag Reduction Methods and Flow Analysis Shaik Mohammed Anis M.Tech Student, MLR Institute of Technology, Hyderabad, India. G. Parthasarathy Associate Professor, MLR Institute of Technology,
More informationCFD Analysis of Effect of Variation in Angle of Attack over NACA 2412 Airfoil through the Shear Stress Transport Turbulence Model
IJSRD - International Journal for Scientific Research & Development Vol. 5, Issue 02, 2017 ISSN (online): 2321-0613 CFD Analysis of Effect of Variation in Angle of Attack over NACA 2412 Airfoil through
More informationUrban wind turbines do they have a future? Or will they be white elephants?
Urban wind turbines do they have a future? Or will they be white elephants? Presented by Brian Kirke As part of the What On Earth series, UniSA, 1 November 2012 WWEA* is optimistic about small wind (defined
More informationJob Sheet 1 Blade Aerodynamics
Job Sheet 1 Blade Aerodynamics The rotor is the most important part of a wind turbine. It is through the rotor that the energy of the wind is converted into mechanical energy, which turns the main shaft
More informationDEFINITIONS. Aerofoil
Aerofoil DEFINITIONS An aerofoil is a device designed to produce more lift (or thrust) than drag when air flows over it. Angle of Attack This is the angle between the chord line of the aerofoil and the
More informationDESIGN AND ANALYSIS OF NACA4420 WIND TURBINE AEROFOIL USING CFD
International Journal of Mechanical Engineering and Technology (IJMET) Volume 8, Issue 6, June 2017, pp. 403 410, Article ID: IJMET_08_06_042 Available online at http://www.iaeme.com/ijmet/issues.asp?jtype=ijmet&vtype=8&itype=6
More informationUniversity of Bristol - Explore Bristol Research. Publisher's PDF, also known as Version of record
Liu, X., Azarpeyvand, M., & Joseph, P. (2015). On the acoustic and aerodynamic performance of serrated airfoils. Paper presented at The 22nd International Congress on Sound and Vibration, Florence, France.
More informationCFD AND EXPERIMENTAL STUDY OF AERODYNAMIC DEGRADATION OF ICED AIRFOILS
Colloquium FLUID DYNAMICS 2008 Institute of Thermomechanics AS CR, v.v.i., Prague, October 22-24, 2008 p.1 CFD AND EXPERIMENTAL STUDY OF AERODYNAMIC DEGRADATION OF ICED AIRFOILS Vladimír Horák 1, Dalibor
More informationEXPERIMENTAL INVESTIGATION OF LIFT & DRAG PERFORMANCE OF NACA0012 WIND TURBINE AEROFOIL
EXPERIMENTAL INVESTIGATION OF LIFT & DRAG PERFORMANCE OF NACA0012 WIND TURBINE AEROFOIL Mr. Sandesh K. Rasal 1, Mr. Rohan R. Katwate 2 1 PG Student, 2 Assistant Professor, DYPSOEA Ambi Talegaon, Heat Power
More informationCFD Analysis of Vertical Axis Wind Turbines in close proximity
CFD Analysis of Vertical Axis Wind Turbines in close proximity Via email from M. Paraschivoiu October 2010 Marius Paraschivoiu a, Chad X. Zhang a, Selvanayagam Jeyatharsan a, Norbert V. Dy b, Farooq Saeed
More informationAerodynamics of Winglet: A Computational Fluid Dynamics Study Using Fluent
Aerodynamics of : A Computational Fluid Dynamics Study Using Fluent Rohit Jain 1, Mr. Sandeep Jain, Mr. Lokesh Bajpai 1PG Student, Associate Professor, Professor & Head 1 Mechanical Engineering Department
More informationAerodynamic Analysis of Blended Winglet for Low Speed Aircraft
, July 1-3, 2015, London, U.K. Aerodynamic Analysis of Blended Winglet for Low Speed Aircraft Pooja Pragati, Sudarsan Baskar Abstract This paper provides a practical design of a new concept of massive
More informationComputational Fluid Flow Analysis of Formula One Racing Car Triya Nanalal Vadgama 1 Mr. Arpit Patel 2 Dr. Dipali Thakkar 3 Mr.
IJSRD - International Journal for Scientific Research & Development Vol. 3, Issue 02, 2015 ISSN (online): 2321-0613 Computational Fluid Flow Analysis of Formula One Racing Car Triya Nanalal Vadgama 1 Mr.
More informationIt should be noted that the symmetrical airfoil at zero lift has no pitching moment about the aerodynamic center because the upper and
NAVWEPS -81-8 and high power, the dynamic pressure in the shaded area can be much greater than the free stream and this causes considerably greater lift than at zero thrust. At high power conditions the
More informationANALYSIS OF HEAT TRANSFER THROUGH EXTERNAL FINS USING CFD TOOL
ANALYSIS OF HEAT TRANSFER THROUGH EXTERNAL FINS USING CFD TOOL B. Usha Rani 1 and M.E Thermal 2 1,2 Asst.Professor, Dadi Institute of Engineering and Technology, India Abstract-The rate of heat transfer
More informationWind Flow Model of Area Surrounding the Case Western Reserve University Wind Turbine
Wind Flow Model of Area Surrounding the Case Western Reserve University Wind Turbine Matheus C. Fernandes 1, David H. Matthiesen PhD *2 1 Case Western Reserve University Dept. of Mechanical Engineering,
More informationIncreasing Efficiency of a Twisted Blade Vertical Axis Wind Turbine (VAWT) by Changing Various Parameter
Proceedings of the International Conference on Mechanical Engineering and Renewable Energy 215 (ICMERE215) 26 29 ovember, 215, Chittagong, Bangladesh ICMERE215-PI-226 Increasing Efficiency of a Twisted
More informationAerodynamic characteristics around the stalling angle of the discus using a PIV
10TH INTERNATIONAL SYMPOSIUM ON PARTICLE IMAGE VELOCIMETRY PIV13 Delft, The Netherlands, July 1-3, 2013 Aerodynamic characteristics around the stalling angle of the discus using a PIV Kazuya Seo 1 1 Department
More informationAnalysis of the Impact of Rotor Rigidity on the Aerodynamic Performance of Vertical Axis Wind Turbines
Analysis of the Impact of Rotor Rigidity on the Aerodynamic Performance of Vertical Axis Wind Turbines Ziqin ZHAO, Shangke YUAN School of Civil Engineering, Lanzhou Institute of Technology, Lanzhou, Gansu
More informationAerofoil Profile Analysis and Design Optimisation
Journal of Aerospace Engineering and Technology Volume 3, Issue 2, ISSN: 2231-038X Aerofoil Profile Analysis and Design Optimisation Kondapalli Siva Prasad*, Vommi Krishna, B.B. Ashok Kumar Department
More informationAerodynamic Design, Fabrication and Testing of Wind Turbine Rotor Blades
Aerodynamic Design, Fabrication and Testing of Wind Turbine Rotor Blades T.Mahendrapandian Department of Mechanical Engineering P.G. Student, Regional Centre of Anna University, Tirunelveli, Tamilnadu,
More informationAnalysis of Wind Turbine Blade
International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347-5161 2014 INPRESSCO, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article Analysis
More informationAerodynamic Terms. Angle of attack is the angle between the relative wind and the wing chord line. [Figure 2-2] Leading edge. Upper camber.
Chapters 2 and 3 of the Pilot s Handbook of Aeronautical Knowledge (FAA-H-8083-25) apply to powered parachutes and are a prerequisite to reading this book. This chapter will focus on the aerodynamic fundamentals
More informationAN EXPERIMENTAL STUDY OF THE EFFECTS OF SWEPT ANGLE ON THE BOUNDARY LAYER OF THE 2D WING
AN EXPERIMENTAL STUDY OF THE EFFECTS OF SWEPT ANGLE ON THE BOUNDARY LAYER OF THE 2D WING A. Davari *, M.R. Soltani, A.Tabrizian, M.Masdari * Assistant Professor, Department of mechanics and Aerospace Engineering,
More informationA CFD Analysis of a Wind Turbine Blade Design at Various Angle of Attack and Low Reynolds Number
A CFD Analysis of a Wind Turbine Blade Design at Various Angle of Attack and Low Reynolds Number Raju Kumar, Priyanka Jhawar, Sanjay Kalraiya Sri Satya Sai University of Technology & Medical Sciences,
More informationDesign & Analysis of Natural Laminar Flow Supercritical Aerofoil for Increasing L/D Ratio Using Gurney Flap
Design & Analysis of Natural Laminar Flow Supercritical Aerofoil for Increasing L/D Ratio Using Gurney Flap U.Praveenkumar 1, E.T.Chullai 2 M.Tech Student, School of Aeronautical Science, Hindustan University,
More informationInduced Drag Reduction for Modern Aircraft without Increasing the Span of the Wing by Using Winglet
International Journal of Mechanical & Mechatronics Engineering IJMME-IJENS Vol:10 No:03 49 Induced Drag Reduction for Modern Aircraft without Increasing the Span of the Wing by Using Winglet Mohammad Ilias
More informationDesign and Analysis of Archimedes Aero-Foil Wind Turbine Blade for Light and Moderate Wind Speeds
Design and Analysis of Archimedes Aero-Foil Wind Turbine Blade for Light and Moderate Wind Speeds Dr S. Srinivasa Rao #1 Kota Shanmukesh #2, M K Naidu 3, Praveen Kalla 4 1,3,4 Associate Professor, 2 Postgraduate
More informationCFD ANALYSIS OF EFFECT OF FLOW OVER NACA 2412 AIRFOIL THROUGH THE SHEAR STRESS TRANSPORT TURBULENCE MODEL
CFD ANALYSIS OF EFFECT OF FLOW OVER NACA 2412 AIRFOIL THROUGH THE SHEAR STRESS TRANSPORT TURBULENCE MODEL 1 SHIVANANDA SARKAR, 2SHAHEEN BEG MUGHAL 1,2 Department of Mechanical Engineering, ITM University,
More informationModelling the Output of a Flat-Roof Mounted Wind Turbine with an Edge Mounted Lip
Modelling the Output of a Flat-Roof Mounted Wind Turbine with an Edge Mounted Lip S. J. Wylie 1, S. J. Watson 1, D. G. Infield 2 1 Centre for Renewable Energy Systems Technology, Department of Electronic
More informationStability and Flight Controls
Stability and Flight Controls Three Axes of Flight Longitudinal (green) Nose to tail Lateral (blue) Wing tip to Wing tip Vertical (red) Top to bottom Arm Moment Force Controls The Flight Controls Pitch
More informationDEVELOPMENT OF SAFE VERTICAL AXIS WIND TURBINE
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 29, Taipei, Taiwan DEVELOPMENT OF SAFE VERTICAL AXIS WIND TURBINE FOR OVER SPEED ROTATION Minoru Noda 1, Fumiaki Nagao 2 and Akira
More informationJJT WIND AMPLIFIER
JJT-001-2014 WIND AMPLIFIER Sevvel P 1, Santhosh P 2 1 Assoicate Professor, Department of Mechanical Engineering, Magna College of Engineering Email.Id : sevvel_ready@yahoo.co.in 2 Final year Mechanical
More informationTOPICS TO BE COVERED
UNIT-3 WIND POWER TOPICS TO BE COVERED 3.1 Growth of wind power in India 3.2 Types of wind turbines Vertical axis wind turbines (VAWT) and horizontal axis wind turbines (HAWT) 3.3 Types of HAWTs drag and
More informationDESIGN OF THE MODERN FAMILY OF HELICOPTER AIRFOILS
DESIGN OF THE MODERN FAMILY OF HELICOPTER AIRFOILS Wojciech KANIA, Wienczys!aw STALEWSKI, BogumHa ZWIERCHANOWSKA Institute of Aviation Summary The paper presents results of numerical design and experimental
More informationAn Analysis of Lift and Drag Forces of NACA Airfoils Using Python
An Analysis of Lift and Drag Forces of NACA Airfoils Using Python 1. Tarun B Patel, Sandip T Patel 2, Divyesh T Patel 3, Maulik Bhensdadiya 4 1 M E scholar Government Engineering College, Valsad, Gujarat,
More informationA STUDY ON AIRFOIL CHRACTERISTICS OF A ROTOR BLADE FOR WIND MILL
A STUDY ON AIRFOIL CHRACTERISTICS OF A ROTOR BLADE FOR WIND MILL Dhatchanamurthy.P 1, Karthikeyan.L.M 2, Karthikeyan.R 3 1 Department of Aeronautical Engineering, Kathir College of Engineering (India)
More information