# Aerodynamically Efficient Wind Turbine Blade S Arunvinthan 1, Niladri Shekhar Das 2, E Giriprasad 3 (Avionics, AISST- Amity University, India)

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2 wing, raising the maximum lift coefficient or the lift a wing can generate. This allows the aircraft to generate more lift at a lower speed, reducing the stalling speed of the aircraft, or the minimum speed at which the aircraft will maintain flight. Extending the flap also increases the drag which can be beneficial during approach and landing. But in our innovation, the flap is used as a high lift device that is devised to design a highly efficient blade. The flap is placed at the trailing edge of the blade as the air over the blade speeds up at the tip of the blade as the circulation occurs over the tip [1]. The rotational moment created on the tip is more, even when the force is very much less as the perpendicular distance is more at the tip giving us more lift (i.e. rotation in the case of wind turbine). Hence our design flaps have been used at the tip of the wind turbine blade (Ref fig 1). Fig-1 Usage of Flap The analytical results (The analysis has been done using ANSYS CFD flow solvers) show that with the use of flaps on tip there is: Increased positive pressure difference between the upper and lower side of aerofoil increasing the lift coefficient [2] Increased camber length which in turn increases the surface area and generates more lift than prior designs [ II. RESULTS AND ANALYSIS OF AEROFOIL WITH AND WITHOUT FLAPS: PRESSURE CONTOUR ANALYSIS: The CFD analysis of the aerofoil with and without flaps has been carried out and the results are depicted below: Fig-2 pressure distribution of aerofoil without flaps 50 Page

3 Fig-3 pressure distribution of aerofoil with flaps 20 0 deflected The pressure contour clearly shows that, the use of flap creates positive pressure difference on the aerofoil shape thereby increasing the lift coefficient. We know that when the air is flowing over the aerofoil the velocity is maximum over the upper surface and the pressure is more on the lower surface of the aerofoil (BERNOULI S THEOREM) [4] which is defined here as positive pressure difference and which in turn influences the above mentioned lift coefficient. From the below graphs, we can clearly see that aerofoil without flap has the maximum C L = 1.4 at 12 0 angle of attack whereas we get C L = 1.7 at zero angle of attack in case of aerofoil with flap. Fig-5 C l Vs Α For Without Flap Fig-5 C l Vs Α For With Flap at 30 Degree 51 Page

5 Fig-8 Velocity Distribution of Redefined Blade Model with Flap Fig-9 Pressure Distribution of Aerofoil without Flap Deflections at 35m of the Blade The graphs showing the coefficient of pressure c p is shown below for both the model of wind turbine blade with and without flap. We know that the pressure is more at the bottom surface and less at the upper surface [5] The pressure difference between the upper and the lower surfaces are less in the case of available wind turbine models (i.e. basic model without flap) and the deviation is quite more in the redefined model (i.e. wind turbine blade model with flap) Fig-10 Pressure Distribution of Wind Turbine Blade with Flap Deflection of 20 Degree at 35m Of The Blade Fig-11 C p for Aerofoil without Flap 53 Page

6 Fig-12 C p for Aerofoil with Flap at 30 Degree INFERENCE: [1] Flap increases the lift coefficient c L [2] Flap inserted at tip of the blade maximizes the rotational moment [3] Flap creates pressure difference which makes the turbine to start rotating at lower speeds [4] Rotating at low speeds enables building wind farms at low wind regions [5] Early start of wind turbine enhances the operating time and power generation [6] Installation of suitable flap increases the surface area(a) (power equation of wind turbine (p)= /2 ρav 3 ) [7] Tower heights can be reduced which minimizes cost and makes accessibility much easier [8] Deflected in opposite direction as a brake during high wind conditions to protect from structural damage. IV. CONCLUSION: We know that the world is facing energy crisis everywhere and we can solve that by adopting this new technology in wind turbine field. From the power equation if the area swept by the rotor increases then the power increases. As the same if the pressure increases on the bottom surface of the blade then the blade starts to rotate at much earlier time and at very low wind speeds. It is expected to rotate at about 3.5 m/s instead of 5.5 m/s. As it starts earlier there is more energy production. In wind turbine field each and every minute is very important and they pay for that. This innovative technology is going to change the shape of the wind turbine blades soon.as per the American estimation we can produce power for less than 5 cents/kwh. By this technology we can save more than that and the amount of production also increases for sure. We can solve the energy crisis everywhere by this technology as it works effectively even in low wind speed regions too. RFERENCES: [1] Peter J Schubel,Richard J Crossley., Wind Turbine Blade Design, Energies 2012, ISSN [2] Cory S. Jang, James C Ross., Numerical Investigation of an Aerofoil with a Gurney Flap NASA Ames Research Centre, USA. [3] Chapter-4, Introduction to Aeronautics A Design Perspective., University of Southampton [4] Mizrap Bulunuz, Olga S Jarrett., Properties of Air and Bernoulli s principle, Asia Pacific Forum on Science Learning and Teaching. [5] David M. Smiadak., Lift Coefficient for an Aerofoil., Grand valley State University July [6] A C Hansen, C P Butterfield., Aerodynamics of Horizontal Axis Wind Turbine Blades, Annual Review of Fluid Mechanics, volume-25, January Page

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