Wind loads investigations of HAWT with wind tunnel tests and site measurements
|
|
- Anthony Blair
- 6 years ago
- Views:
Transcription
1 loads investigations of HAWT with wind tunnel tests and site measurements Shigeto HIRAI, Senior Researcher, Nagasaki R&D Center, Technical Headquarters, MITSUBISHI HEAVY INDSUTRIES, LTD, Fukahori, Nagasaki, JAPAN Phone: /Fax: / Akihiro HONDA, Research Manager, Nagasaki R&D Center, Technical Headquarters, MITSUBISHI HEAVY INDSUTRIES, LTD, Fukahori, Nagasaki, JAPAN Kai KARIKOMI, Researcher, Nagasaki R&D Center, Technical Headquarters, MITSUBISHI HEAVY INDSUTRIES, LTD, Fukahori, Nagasaki, JAPAN Abstract loads acting on HAWT (Horizontal Axis Turbine) are quite different from those of other structures. At first, wind loads largely depend on the natural wind on the site, which is accompanied with random fluctuations and probabilistic phenomena. Secondly, even in the same wind condition, the wind loads also depend on the configuration of HAWT against wind and on its operational status. Especially in Japan, the former factor may play bigger role because of the increase of fluctuation by more complicated surrounding terrain and higher extreme wind speed caused by typhoons, which may be somewhat common in East Asia. Therefore, it is important to understand how wind loads are action on HAWT with various conditions for more sophisticated load design. In this study, wind tunnel experiments have been conducted using large scale model of HAWT with 2 meter diameter of model rotor. The wind loads were measured with strain gauges attached on the model. The basic tendency of wind loads are shown according with basic parameters, like azimuth angle, wind direction, blade configuration and so on. The results are also compared with site measurements which have been obtained in prototype. In the data obtained at the site, large scattering may be observed which is affected by the fluctuations of natural wind. However, common characteristics can be found between wind tunnel tests and site measurements. The obtained data are being used to publish new guideline for introducing HAWT in Japan and it would reduce the risk of mismatch between the site condition and the introduced turbines. Key Words energy, tunnel experiment, load, HAWT 1. Introduction loads are the most important factor for the design of HAWT (Horizontal Axis Turbine) as well as other big structures, like high buildings, long bridges and so on. However, those of HAWT have quite different characteristics when compared with those of other structures. At first, wind loads largely depend on the natural wind on the site, which is accompanied with random fluctuations and probabilistic phenomena. Since most of the wind loads are acting on the rotor and it is a part which keeps constantly rotating, fatigue loads play more important roles in the design loads of HAWT and they are sensitive to turbulence of natural wind. For other structures, it is common to focus mainly on extreme loads. Furthermore, HAWT is often located where mean wind speed is expected to be higher, like on top of hill or ridge. This makes the extreme wind speed for design also higher. Secondly, even in the same wind condition, the wind loads also depend on the configuration of HAWT against wind and on its operational status. When the wind speed goes up, HAWT stops power production and changes the configuration of its rotor to some resting position in order to reduce the increase of wind loads. Even in lower speed during HAWT is producing energy, the sudden change of wind may cause the increase of wind loads and HAWT starts to change the pitch angle of blades or the yaw angle of rotor to avoid the increase of wind loads. These are quite different from other structures with fixed shape, which means constant wind force coefficient. Especially in Japan, the former factor may play bigger role because of the increase of fluctuation by more complicated surrounding terrain and higher extreme wind speed caused by typhoons, which may
2 be somewhat common in East Asia. Therefore, it is important to understand how wind loads are acting on HAWT with various conditions for more sophisticated load design. In this study, wind tunnel experiments have been conducted using large scale model of HAWT and wind loads were measured. Many researches have been reported with various ideas for modeling wind turbines in wind tunnel, sometimes in a very big scale 1). Simulating the wind load in prototype is more focused in this study. The basic tendency of wind loads are shown according with basic parameters. The results are also compared with site measurements which have been obtained in prototype. 2. Tunnel Experiments tunnel experiments have been conducted to understand the basic aerodynamic characteristics of HAWT. In this study, two factors which may govern wind loads have been focused. One is unsteadiness of the flow and the other is the various configuration of HAWT. The size of the model was intended to be set as comparatively large with 2 meter diameter of model rotor, though Reynolds Number between the model and the prototype is still different for more than one order. The prototype was set to 1 MW class HAWT and the model scale was around 1/30. The model rotor was designed to have similar shape as the prototype. The nacelle and the tower was also modeled with some deformation to house sensors and electric motor to control the rotor. The model properties are shown in Table 1 and Figure 1. The rotational speed was adjusted with electric motor. The pitch angle of blades and the yaw angle of the rotor was changed manually. The rotor torque and horizontal force was measured. The bending moment at blade root was also measured. Table 1 Model Properties Item Prototype Model Scale 1 1 / 30.7 Rotor Daimeter 61.4 m 2.0 m Hub Height 68 m 2.2 m Rotational (Normal Operation) 19.8 rpm Adjustable Rotor Hub Blade Blade root bending moment sensor Rotor torque sensor Horizontal force sensor Tower Fig. 1 Model Setup The above model was placed in wind tunnel with cross section area of 30 square meters. This resulted in blockage ratio of around 10% when rotor swept area is used as index. To simulate the unsteadiness of natural wind, two techniques were used. One is boundary layer flow similar to the natural wind, which includes the vertical profile of mean wind speed and the turbulence. The other is artificial change of mean wind speed or wind direction generated by the movable cascades. These
3 changing flow conditions were intended to qualitatively simulate the gust described in IEC standard 2). To simulate the different operating conditions and configuration, the experimental conditions were changed as in Table 2. Table 2 Typical Experimental Conditions Simulated Operating Rotational Condition *1 Tip *1 Tip Reynolds *1 Ratio Number *2 Power Production Rated 600rpm 62.8m/s 9m/s *10 5 Power Production 220rpm 23.0m/s 9m/s *10 5 Idling (Fine Pitch) Extreme Slow (0m/s) 9m/s - 0.3*10 5 Idling (Feather Pitch) Extreme Slow (0m/s) 9m/s - 0.3*10 5 *1:Standard value for experiment *2:Based on average chord length of blade as typical length and relative wind speed at blade tip 3. Experiment Results 3.1. Model Rotor Properties To check the aerodynamic properties of model rotor, the power coefficient and thrust force coefficient was measured in smooth flow. The maximum power coefficient was around 0.3 which is little lower than the prototype. The main difference is expected to be from the low value of Reynolds Number and the lift and drag properties are worsened. The effect of yaw angle of rotor and tip speed ratio is shown in Figure 2. The tip speed ratio has remarkable effect especially for power coefficient and gives maximum value near that of the prototype. The effect of yaw angle is also clearer for power coefficient. C P [-] Tip 周速比 [-] Ratio (a) Power Coefficient Cp 0deg -15deg +15deg Yaw Angle C Fx [-] deg deg +15deg Yaw Angle Tip 周速比 [-] Ratio (b) Thrust Force Coefficient CFx Fig. 2 Model Rotor Properties (Smooth Flow) 3.2. in Turbulent Flow Figure 3 shows the time series of wind loads measured in boundary layer turbulent flow. The turbine is supposed to be in power production mode at rated wind speed. Each component of wind load shows random fluctuation, which is mainly due to the turbulence of wind. In natural wind in the atmosphere, the variation of wind load acting on HAWT is expected to be quite dependent on the turbulence. Therefore it becomes important to estimate the wind properties where the HAWT is located Effect of Rotor Configuration When the wind speed increases, HAWT stops power production and changes the configuration of its rotor to reduce the high wind loads. There are mainly two types in the view of pitch angle of blades.
4 Pitch-regulated turbine moves the blades into feather pitch, where the blade plane is almost perpendicular to the rotor plane. The rotor plane is kept perpendicular to the wind direction, though in some cases the rotor is changed to face downwind. In stall-regulated turbines, the blade pitch angle is fixed to fine pitch, where the blade plane is almost parallel to the rotor plane. The rotor plane is changed to be parallel to the wind direction. Figure 4 shows the wind loads in various rotor configurations when the turbine is idling at high wind speed. The wind loads show big change depending on both pitch angle and wind direction offset. In the view of favorable configuration to reduce the wind loads, it is clear that each type of turbine is to operate in order to minimize the wind load by above-mentioned configuration change. C P(-) (a) Power Coefficient C Mx(-) (b) Blade Root Moment (Edge Direction) C My(-) (c) Blade Root Moment (Flap Direction) C Fx(-) (d) Thrust Force Fig. 3 Time Series of Load (Power Production Mode at Rated, Boundary Layer Turbulent Flow) 0.08 Thrust Force C Fx 0.06 ファイン Fine 0.04 フェザー Feather Direction 風向偏差 Offset (deg) (deg.) Direction Offset θ Side Force Fy Thrust Force Fx Side Force C Fy ファイン Fine フェザー Feather Top View Direction 風向偏差 Offset (deg) (deg.) Fig. 4 Load Depending on Rotor Configuration (Idling at High, Boundary Layer Turbulent Flow)
5 From these data, the wind loads can be summarized as in Table 3. Table 3 Depending on Turbine Configuration and Type Type During Power Production Idling in High Fine pitch Feather Pitch Rotor plane to face upwind Rotor plane to face upwind (otherwise Force coefficient to vary and to decrease downwind) above rated wind speed loads to increase by the power of loads to have maximu around two rated wins speed Possibility of loss of yaw control Pitch- Regulated Turbine Rated Stall- Regulated Turbine Fine Pitch Rotor plane to face upwind Larger force coefficient above rated wind speed loads to show some increease abovbe rated wind speed and to become maximum at cut-out wind speed Rated Fine Pitch Rotor plane to be parallel to wind axis loads to increase by the power of two Possibility of loss of yaw control Note: The above description shows general properties and may differ for each make. 4. Comparison with Site Measurements In several HAWT site in Japan, site measurements were carried out to investigate the wind load 3). The obtained data includes tower base moment. To make comparison this data with the data from wind tunnel test, the tower base moment was calculated from the thrust force. Figure 5 shows the comparison between them. The target turbine in site measurements is pitchregulated type. The data from site measurements shows typical dependency on wind speed shown in Table 3. Large scattering may be observed which is affected by the fluctuations of natural wind for fluctuating components. However, common characteristics can be found between wind tunnel tests and site measurements, especially for time-averaged values. The data from wind tunnel test agrees well with them. As for wind loads along the wind axis governed by rotor thrust force, the characteristics can be simulated by wind tunnel test, though careful attention may be necessary for the similarity of the model and experimental conditions.
6 Normalized Tower Base Moment タワー基部の合成モーメント (Along wind) / 定格風速の平均モーメント 実測平均 Site 実験平均 Tunnel Mean ナセル平均風速 (m/s) (m/s) Fig.5 Comparison of wind loads between site measurements and wind tunnel test (Pitch-regulated, Both power production and idling) 5. Conclusion loads acting on HAWT were investigated by wind tunnel test. The data can explain the various changes of wind loads depending on wind speed, turbine type, operational mode and so on. These are more complicated than other big structures. Comparison between wind tunnel test and site measurements shows good agreement at least for thrust component. tunnel test can be useful to understand the phenomenon concerning with such wind loads, though special attention should be necessary for the model and experimental conditions. The obtained data are being used to publish new guideline 4) for introducing HAWT in Japan and it would reduce the risk of mismatch between the site condition and the introduced turbines. This study was conducted in part of Japanese project funded by The New Energy and Industrial Technology Development Organization (NEDO) and the authors would like to thank the committee members, NEDO, Toyo Sekkei and The Central Research Institute of Electric Power Industry (CRIEPI). 6. References 1) 2) IEC , turbines Part 1: Design requirements, Edition 3.0, ) A Honda et al., Site Measurement, Tunnel Test and Numerical Simulation of the aerodynamic load acting on wind turbine generator (in Japanese), Journal of Japan Association for Engineering, Vol.33, No.2, ) The New Energy and Industrial Technology Development Organization (NEDO), Guideline for Turbines in Japan (Part for Typhoons and Turbulence) (in Japanese), 2008 (to be published).
2MW baseline wind turbine: model development and verification (WP1) The University of Tokyo & Hitachi, Ltd.
2MW baseline wind turbine: model development and verification (WP1) The University of Tokyo & Hitachi, Ltd. Downwind turbine technology, IEA Wind Task 40 First Progress Meeting, Tokyo, Japan 11 Dec, 2017
More informationPRESSURE DISTRIBUTION OF SMALL WIND TURBINE BLADE WITH WINGLETS ON ROTATING CONDITION USING WIND TUNNEL
International Journal of Mechanical and Production Engineering Research and Development (IJMPERD ) ISSN 2249-6890 Vol.2, Issue 2 June 2012 1-10 TJPRC Pvt. Ltd., PRESSURE DISTRIBUTION OF SMALL WIND TURBINE
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 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 informationComparison of upwind and downwind operation of the NREL Phase VI Experiment
Journal of Physics: Conference Series PAPER OPEN ACCESS Comparison of upwind and downwind operation of the NREL Phase VI Experiment To cite this article: S M Larwood and R Chow 2016 J. Phys.: Conf. Ser.
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 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 informationEvaluation of wind loads by a passive yaw control at the extreme wind speed condition and its verification by measurements
Evaluation of wind loads by a passive yaw control at the extreme wind speed condition and its verification by measurements Dec/11/2017 Soichiro Kiyoki Takeshi Ishihara Mitsuru Saeki Ikuo Tobinaga (Hitachi,
More informationA NOVEL FLOATING OFFSHORE WIND TURBINE CONCEPT: NEW DEVELOPMENTS
A NOVEL FLOATING OFFSHORE WIND TURBINE CONCEPT: NEW DEVELOPMENTS L. Vita, U.S.Paulsen, T.F.Pedersen Risø-DTU Technical University of Denmark, Roskilde, Denmark luca.vita@risoe.dk Abstract: A novel concept
More informationDual pitch revisited: Overspeed avoidance by independent control of two blade sections
Dual pitch revisited: Overspeed avoidance by independent control of two blade sections P. Brosche, B. Fischer, P. Loepelmann, M. Shan {philipp.brosche, boris.fischer, peter.loepelmann, martin.shan}@iwes.fraunhofer.de
More informationPressure distribution of rotating small wind turbine blades with winglet using wind tunnel
Journal of Scientific SARAVANAN & Industrial et al: Research PRESSURE DISTRIBUTION OF SMALL WIND TURBINE BLADES WITH WINGLET Vol. 71, June 01, pp. 45-49 45 Pressure distribution of rotating small wind
More informationAerodynamic Control of Flexible Structures in the Natural Wind
Ian Castro 65 th Birthday Workshop, Southampton University, 28-29. 3. 12. Aerodynamic Control of Flexible Structures in the Natural Wind Mike Graham Department of Aeronautics, Imperial College London.
More informationLECTURE 18 WIND POWER SYSTEMS. ECE 371 Sustainable Energy Systems
LECTURE 18 WIND POWER SYSTEMS ECE 371 Sustainable Energy Systems 1 HISTORICAL DEVELOPMENT The first wind turbine used to generate electricity was built by La Cour of Denmark in 1891 2 HISTORICAL DEVELOPMENT
More information7 JAXA Special Publication JAXA-SP--8E the internal wall surface of the tower at the three different levels shown in Figure. Strain (in the vertical d
First International Symposium on Flutter and its Application, 739 Wind Loads on a Bottom-mounted Offshore Wind Turbine Tower Kazumasa OKUBO +, Manabu YAMAMOTO +, Yukinari FUKUMOTO +3 and Takeshi ISHIHARA
More informationAERODYNAMIC CHARACTERISTICS OF SPIN PHENOMENON FOR DELTA WING
ICAS 2002 CONGRESS AERODYNAMIC CHARACTERISTICS OF SPIN PHENOMENON FOR DELTA WING Yoshiaki NAKAMURA (nakamura@nuae.nagoya-u.ac.jp) Takafumi YAMADA (yamada@nuae.nagoya-u.ac.jp) Department of Aerospace Engineering,
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 informationControl Strategies for operation of pitch regulated turbines above cut-out wind speeds
Control Strategies for operation of pitch regulated turbines above cut-out wind speeds Helen Markou 1 Denmark and Torben J. Larsen, Risø-DTU, P.O.box 49, DK-4000 Roskilde, Abstract The importance of continuing
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 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 informationWIND-INDUCED LOADS OVER DOUBLE CANTILEVER BRIDGES UNDER CONSTRUCTION
WIND-INDUCED LOADS OVER DOUBLE CANTILEVER BRIDGES UNDER CONSTRUCTION S. Pindado, J. Meseguer, J. M. Perales, A. Sanz-Andres and A. Martinez Key words: Wind loads, bridge construction, yawing moment. Abstract.
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 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 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 informationEnergy from wind and water extracted by Horizontal Axis Turbine
Energy from wind and water extracted by Horizontal Axis Turbine Wind turbines in complex terrain (NREL) Instream MHK turbines in complex bathymetry (VP East channel NewYork) Common features? 1) horizontal
More informationCitation Journal of Thermal Science, 18(4),
NAOSITE: Nagasaki University's Ac Title Author(s) Noise characteristics of centrifuga diffuser (Noise reduction by means leading tip) Murakami, Tengen; Ishida, Masahiro; Citation Journal of Thermal Science,
More informationInvestigation of Horizontal Axis Wind Turbine Performance in Simulated Natural Wind by an Active Control Multi-Fan Wind Tunnel
Proceedings of 13th nternational Symposium on Experimental and Computational Aerothermodynamics of nternal Flows May 8-11, 2017, Okinawa, Japan SAF13-S-0024 nvestigation of Horizontal Axis Wind Turbine
More informationPower curves - use of spinner anemometry. Troels Friis Pedersen DTU Wind Energy Professor
Power curves - use of spinner anemometry Troels Friis Pedersen DTU Wind Energy Professor Spinner anemometry using the airflow over the spinner to measure wind speed, yaw misalignment and flow inclination
More informationSteady State Comparisons HAWC2 v12.5 vs HAWCStab2 v2.14: Integrated and distributed aerodynamic performance
Downloaded from orbit.dtu.dk on: Jan 29, 219 Steady State Comparisons v12.5 vs v2.14: Integrated and distributed aerodynamic performance Verelst, David Robert; Hansen, Morten Hartvig; Pirrung, Georg Publication
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 informationPOWERED FLIGHT HOVERING FLIGHT
Once a helicopter leaves the ground, it is acted upon by the four aerodynamic forces. In this chapter, we will examine these forces as they relate to flight maneuvers. POWERED FLIGHT In powered flight
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 informationComputationally Efficient Determination of Long Term Extreme Out-of-Plane Loads for Offshore Turbines
Computationally Efficient Determination of Long Term Extreme Out-of-Plane Loads for Offshore Turbines Anand Natarajan Senior Scientist Wind Energy Department, Risø DTU Denmark Introduction IEC 61400-1
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 informationLarge-eddy simulation study of effects of clearing in forest on wind turbines
Large-eddy simulation study of effects of clearing in forest on wind turbines J. Matsfelt 1 and L. Davidson 1 1 Chalmers University of Technology, Dep. of Mechanics and Maritime Sciences, Div. of Fluid
More informationA Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine
A Numerical Simulation Comparing the Efficiencies of Tubercle Versus Straight Leading Edge Airfoils for a Darrieus Vertical Axis Wind Turbine By: Ross Neal Abstract: The efficiencies of sinusoidal and
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 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 informationThe EllipSys2D/3D code and its application within wind turbine aerodynamics
The EllipSys2D/3D code and its application within wind turbine aerodynamics Niels N. Sørensen Wind Energy Department, Risø DTU National Laboratory for Sustainable Energy and Dep. Civil Engineering, Aalborg
More informationEffect of Pitch Angle and Reynolds Number on Aerodynamic Characteristics of a Small Horizontal Axis Wind Rotor
Journal of Applied Fluid Mechanics, Vol. 11, No. 3, pp. 613-620, 2018. Available online at www.jafmonline.net, ISSN 1735-3572, EISSN 1735-3645. DOI: 10.18869/acadpub.jafm.73.246.28246 Effect of Pitch Angle
More informationEFFECT OF GURNEY FLAPS AND WINGLETS ON THE PERFORMANCE OF THE HAWT
Chapter-6 EFFECT OF GURNEY FLAPS AND WINGLETS ON THE PERFORMANCE OF THE HAWT 6.1 Introduction The gurney flap (wicker bill) was a small flat tab projecting from the trailing edge of a wing. Typically it
More informationOptimization of Blades of Horizontal Wind Turbines by Choosing an Appropriate Airfoil and Computer Simulation
International Journal of Current Engineering and Technology E-ISSN 2277 4106, P-ISSN 2347 5161 2017 INPRESSCO, All Rights Reserved Available at http://inpressco.com/category/ijcet Research Article Optimization
More informationTOWARD MORE ACCURATE PREDICTION OF DAMAGE DUE TO STRONG WINDS
TOWARD MORE ACCURATE PREDICTION OF DAMAGE DUE TO STRONG WINDS Kichiro KIMURA Kyushu Institute of Technology ABSTRACT: The insured losses of structures due to strong winds have been always dominant and
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 informationCFD development for wind energy aerodynamics
CFD development for wind energy aerodynamics Hamid Rahimi, Bastian Dose, Bernhard Stoevesandt Fraunhofer IWES, Germany IEA Task 40 Kick-off Meeting 12.11.2017 Tokyo Agenda BEM vs. CFD for wind turbine
More informationEFFECTS OF SIDEWALL OPENINGS ON THE WIND LOADS ON PIPE-FRAMED GREENHOUSES
The Seventh Asia-Pacific Conference on Wind Engineering, November 8-12, 29, Taipei, Taiwan EFFECTS OF SIDEWALL OPENINGS ON THE WIND LOADS ON PIPE-FRAMED GREENHOUSES Yasushi Uematsu 1, Koichi Nakahara 2,
More informationMeasurement and simulation of the flow field around a triangular lattice meteorological mast
Measurement and simulation of the flow field around a triangular lattice meteorological mast Matthew Stickland 1, Thomas Scanlon 1, Sylvie Fabre 1, Andrew Oldroyd 2 and Detlef Kindler 3 1. Department of
More informationLoad Consequences when Sweeping Blades - A Case Study of a 5 MW Pitch Controlled Wind Turbine
Downloaded from orbit.dtu.dk on: Nov 26, 2018 Load Consequences when Sweeping Blades - A Case Study of a 5 MW Pitch Controlled Wind Turbine Verelst, David Robert; Larsen, Torben J. Publication date: 2010
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 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 informationApplication of a Reduced Order Wind Farm Model on a Scaled Wind Farm
Technische Universität München Wind Energy Institute Application of a Reduced Order Wind Farm Model on a Scaled Wind Farm J Schreiber 1, C L Bottasso 1,2 johannes.schreiber@tum.de 1 Wind Energy Institute,
More informationWESEP 594 Research Seminar
WESEP 594 Research Seminar Aaron J Rosenberg Department of Aerospace Engineering Iowa State University Major: WESEP Co-major: Aerospace Engineering Motivation Increase Wind Energy Capture Betz limit: 59.3%
More informationCHAPTER 9 PROPELLERS
CHAPTER 9 CHAPTER 9 PROPELLERS CONTENTS PAGE How Lift is Generated 02 Helix Angle 04 Blade Angle of Attack and Helix Angle Changes 06 Variable Blade Angle Mechanism 08 Blade Angles 10 Blade Twist 12 PROPELLERS
More informationSimulation and Parameter Evaluation of Wind Turbine Blade
International OPEN ACCESS Journal Of Modern Engineering Research (IJMER) Simulation and Parameter Evaluation of Wind Turbine Blade Parth Rathod 1, Hiren Shah 2 * Mechanical Department, CGPIT, Uka Tarsadia
More informationPREDICTION THE EFFECT OF TIP SPEED RATIO ON WIND TURBINE GENERATOR OUTPUT PARAMETER
Int. J. Mech. Eng. & Rob. Res. 2012 Hari Pal Dhariwal et al., 2012 Research Paper ISSN 2278 0149 www.ijmerr.com Vol. 1, No. 3, October 2012 2012 IJMERR. All Rights Reserved PREDICTION THE EFFECT OF TIP
More informationInfluence of the Number of Blades on the Mechanical Power Curve of Wind Turbines
European Association for the Development of Renewable Energies, Environment and Power quality International Conference on Renewable Energies and Power Quality (ICREPQ 9) Valencia (Spain), 15th to 17th
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 informationDevelopment of Fish type Robot based on the Analysis of Swimming Motion of Bluefin Tuna Comparison between Tuna-type Fin and Rectangular Fin -
Development of Fish type Robot based on the Analysis of Swimming Motion of Bluefin Tuna Comparison between Tuna-type Fin and Rectangular Fin - Katsuya KUGAI* Abstract The swimming motion of Tuna type fishes
More informationKazuhiko TOSHIMITSU 1, Hironori KIKUGAWA 2, Kohei SATO 3 and Takuya SATO 4. Introduction. Experimental Apparatus
Proceedings of 4th Asian Joint Workshop on Thermophysics and Fluid Science Oct. 14~17, 2012, Busan, Korea Experimental Investigation of Performance of the Wind Turbine with the Flanged-diffuser Shroud
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 informationA Novel Vertical-Axis Wind Turbine for Distributed & Utility Deployment
A Novel Vertical-Axis Wind Turbine for Distributed & Utility Deployment J.-Y. Park*, S. Lee* +, T. Sabourin**, K. Park** * Dept. of Mechanical Engineering, Inha University, Korea + KR Wind Energy Research
More informationAn Analysis of Damaged Wind Turbines by Typhoon Maemi in 2003
An Analysis of Damaged Wind Turbines by Typhoon Maemi in 23 Takeshi Ishihara 1), Atsushi Yamaguchi 1), Keiji Takahara 2), Takehiro Mekaru 2) and Shinich Matsuura 3) 1) Institute of Engineering Innovation,
More informationWindmills using aerodynamic drag as propelling force; a hopeless concept. ing. A. Kragten. April 2009 KD 416
Windmills using aerodynamic drag as propelling force; a hopeless concept It is allowed to copy this report for private use. ing. A. Kragten April 2009 KD 416 Engineering office Kragten Design Populierenlaan
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 informationSTUDIES ON THE OPTIMUM PERFORMANCE OF TAPERED VORTEX FLAPS
ICAS 2000 CONGRESS STUDIES ON THE OPTIMUM PERFORMANCE OF TAPERED VORTEX FLAPS Kenichi RINOIE Department of Aeronautics and Astronautics, University of Tokyo, Tokyo, 113-8656, JAPAN Keywords: vortex flap,
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 informationWind Power generation
Lecture 28 Wind Power generation Basic technology Wind electric generator converts kinetic energy available in wind to electrical energy by using rotor, gear box and generator. Wind Power The terms "wind
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 informationASME International Mechanical Engineering Congress & Exhibition IMECE 2013 November 15-21, 2013, San Diego, California, USA
ASME International Mechanical Engineering Congress & Exhibition IMECE 2013 November 15-21, 2013, San Diego, California, USA IMECE2013-62734 AERODYNAMIC CHARACTERISTICS OF HORIZONTAL AXIS WIND TURBINE WITH
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 informationStudy on wind turbine arrangement for offshore wind farms
Downloaded from orbit.dtu.dk on: Jul 01, 2018 Study on wind turbine arrangement for offshore wind farms Shen, Wen Zhong; Mikkelsen, Robert Flemming Published in: ICOWEOE-2011 Publication date: 2011 Document
More informationEXPERIMENTAL INVESTIGATION OF WAKE SURVEY OVER A CYLINDER WITH DIFFERENT SURFACE PROFILES
EXPERIMENTAL INVESTIGATION OF WAKE SURVEY OVER A CYLINDER WITH DIFFERENT SURFACE PROFILES Abdul Ahad Khan 1, Abhishek M. B 2, Tresa Harsha P George 3 1 Under Graduate student, Department of Aeronautical
More informationIncreased Aerodynamic Performance of Wind Turbines Through Improved Wind Gust Detection and Extreme Event Control
Increased Aerodynamic Performance of Wind Turbines Through Improved Wind Gust Detection and Extreme Event Control Eelco Nederkoorn DotX Control Solutions Alkmaar, The Netherlands e.nederkoorn@dotxcontrol.com
More informationEfficiency of Upwind and Downwind Thai Sail Windmill
Journal of Engineering and Science Research 1 (2): 01-06, 2017 e-issn 2289-7127 RMP Publications, 2017 DOI: 10.26666/rmp.jesr.2017.2.1 Efficiency of Upwind and Downwind Thai Sail Windmill Teerawat Klabklay
More informationComparison of Experimental results with CFD for NREL Phase VI Rotor with Tip Plate
Comparison of Experimental results with CFD for NREL Phase VI Rotor with Tip Plate EswaraRao Anjuri VSJ* *Turbine CFD, Vestas Technology R&D, Chennai, India esran@vestas.com Corresponding Author; EswaraRao
More informationEffects of seam and surface texture on tennis balls aerodynamics
Available online at www.sciencedirect.com Procedia Engineering 34 (2012 ) 140 145 9 th Conference of the International Sports Engineering Association (ISEA) Effects of seam and surface texture on tennis
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 informationComparison of Wind Turbines Regarding their Energy Generation.
Comparison of Wind Turbines Regarding their Energy Generation. P. Mutschler, Member, EEE, R. Hoffmann Department of Power Electronics and Control of Drives Darmstadt University of Technology Landgraf-Georg-Str.
More informationPart I: Blade Design Methods and Issues. James L. Tangler
Part I: Blade Design Methods and Issues James L. Tangler Senior Scientist National Renewable Energy Laboratory National Wind Technology Center Steady-State Aerodynamics Codes for HAWTs Selig, Tangler,
More informationExperimental study on aerodynamic characteristics of vertical-axis wind turbine
International Journal of Smart Grid and Clean Energy Experimental study on aerodynamic characteristics of vertical-axis wind turbine Yihuai Hu a*, Taiyou Wang a, Hao Jin a, Xianfeng Cao b, Chen Zhang b
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 informationDesign of Naca63215 Airfoil for a Wind Turbine
IOSR Journal of Mechanical and Civil Engineering (IOSR-JMCE) e-issn: 2278-1684,p-ISSN: 2320-334X, Volume 10, Issue 2 (Nov. - Dec. 2013), PP 18-26 Design of Naca63215 Airfoil for a Wind Turbine 1 N.Manikandan,
More informationLely Aircon LA30 Wind turbine
Lely Aircon LA30 Wind turbine Summary Details for Performance, Duration and Acoustic Measurements Lely Aircon 30 Wind Turbine UK MCS Certification Summary List of contents 1. List of included Amendments...
More informationComparison of Phatas versions and the Wind Turbine module C. Lindenburg
ECN-E--11-66 Comparison of Phatas versions and the Wind Turbine module C. Lindenburg December 211 Preface The program Phatas is developed at ECN wind energy for the design and analysis of horizontal axis
More informationStudy on Marine Propeller Running in Bubbly Flow
Third International Symposium on Marine Propulsors smp 13, Launceston, Tasmania, Australia, May 2013 Study on Marine Propeller Running in Bubbly Flow Chiharu Kawakita Mitsubishi Heavy Industries, Ltd.,
More informationIncreased Project Bankability : Thailand's First Ground-Based LiDAR Wind Measurement Campaign
Increased Project Bankability : Thailand's First Ground-Based LiDAR Wind Measurement Campaign Authors: Velmurugan. k, Durga Bhavani, Ram kumar. B, Karim Fahssis As wind turbines size continue to grow with
More informationUniversities of Leeds, Sheffield and York
promoting access to White Rose research papers Universities of Leeds, Sheffield and York http://eprints.whiterose.ac.uk/ This is an author produced version of a paper published in Renewable Energy. White
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 informationEnergy Utilisation of Wind
Ing. Pavel Dostál, Ph.D., Ostrava University 1 Energy Utilisation of Wind Choice of locality Energy and wind output Wind-power installations Wind-power installations: types and classification Basic parts
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 informationThe effect of the number of blades on wind turbine wake - a comparison between 2-and 3-bladed rotors
Journal of Physics: Conference Series PAPER OPEN ACCESS The effect of the number of blades on wind turbine wake - a comparison between 2-and 3-bladed rotors To cite this article: Franz Mühle et al 2016
More informationEffect of wind flow direction on the loads at wind farm. Romans Kazacoks Lindsey Amos Prof William Leithead
Effect of wind flow direction on the loads at wind farm Romans Kazacoks Lindsey Amos Prof William Leithead Objectives: Investigate the effect of wind flow direction on the wind turbine loads (fatigue)
More informationA RECIPE TO ESTIMATE AERODYNAMICS AND LOADS ON ICED ROTOR BLADES
A RECIPE TO ESTIMATE AERODYNAMICS AND LOADS ON ICED ROTOR BLADES Henry Seifert*, Frank Richert** * Deutsches Windenergie-Institut, Ebertstraße 96, D-638 Wilhelmshaven, Germany ** Institut für Flugmechanik,
More informationFigure 1 Figure 1 shows the involved forces that must be taken into consideration for rudder design. Among the most widely known profiles, the most su
THE RUDDER starting from the requirements supplied by the customer, the designer must obtain the rudder's characteristics that satisfy such requirements. Subsequently, from such characteristics he must
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 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 informationHigh Swept-back Delta Wing Flow
Advanced Materials Research Submitted: 2014-06-25 ISSN: 1662-8985, Vol. 1016, pp 377-382 Accepted: 2014-06-25 doi:10.4028/www.scientific.net/amr.1016.377 Online: 2014-08-28 2014 Trans Tech Publications,
More information3D Nacelle Mounted Lidar in Complex Terrain
ENERGY 3D Nacelle Mounted Lidar in Complex Terrain PCWG Hamburg, Germany Paul Lawson 25.03.2015 1 DNV GL 125.03.2015 SAFER, SMARTER, GREENER Agenda Introduction and Project Background Lidar Specifications
More informationWind Tunnel Study on the Structural Stability of a Container Crane According to the Boom Shape
Proceedings of the 4th WSEAS International Conference on Fluid Mechanics, Gold Coast, Queensland, Australia, January 17-19, 2007 64 Wind Tunnel Study on the Structural Stability of a Container Crane According
More informationSEMI-SPAN TESTING IN WIND TUNNELS
25 TH INTERNATIONAL CONGRESS OF THE AERONAUTICAL SCIENCES SEMI-SPAN TESTING IN WIND TUNNELS S. Eder, K. Hufnagel, C. Tropea Chair of Fluid Mechanics and Aerodynamics, Darmstadt University of Technology
More informationEFFECT OF AEROFOIL THICKNESS OVER PRESSURE DISTRIBUTION IN WIND TURBINE BLADES
Int. J. Mech. Eng. & Rob. Res. 2014 S Prathiban et al., 2014 Research Paper ISSN 2278 0149 www.ijmerr.com Vol. 3, No. 4, October 2014 2014 IJMERR. All Rights Reserved EFFECT OF AEROFOIL THICKNESS OVER
More information