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ENHANCING AERODYNAMIC PERFORMANCE

The extraction of energy from the wind is about 30% from its source and the rest of energy is wasted given by betz. This work mainly describes the effective extraction of wind energy from the available source with implementing some of the aerodynamic lift augmentation devices like winglet and gurney flaps which are normally used in aircrafts. The airfoil mainly used in this work is s817 for the blades of 750kw power generation. In general the blades efficiency in the wind turbine is affected by its tip effects. Due to this, the lift generated near blades tip surface is decreased and finally the output of the wind turbine performance is lagging. To overcome this tip effects, the winglets are employed in the system such that the turbulence formed along the blade tip surface is transferred to the some extent. The winglets are designed with various cant angles starting from 30°, 35°, 40°, 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°,90° with 2% height of the rotor diameter. Since the winglet can be either in upward or in downward direction. Based upon this winglets are designed in both directions for the given cant angles. The winglets are employed mainly to reduce the turbulence formed at blade tips in a mean while the gurney flaps are included for providing a increase in lift. The gurney flap designed along with the blade and winglet surface such that the tab height is about 2% of chord length and with some operating angles of 45°, 60°, and 90°. The models developed for wind turbine is analyzed by using CFD. The results obtained are discussed and it is validated with the existing wind turbine blades for the best performance.



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Tue, 19/04/2011 - 21:36

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