Study on the Effect of Trailing Edge Flap on Aerodynamic Performance of Vertical Axis Wind Turbine
In order to improve the aerodynamic efficiency of a vertical axis wind turbine(VAWT),in-spired by the fact that the cylindrical rear splitter flap can reduce the fluctuation of the lift drag coeffi-cient,a new flow control method for the rear splitter flap at trailing edge was proposed.Taking the NACA0015 airfoil as the object,the influence of the length of the flap and the gap between the flap and the airfoil on the aerodynamic performance of the airfoil was studied.At the same time,the influence of the flap on the aerodynamic efficiency of the VAWT under different tip speed ratio conditions was ex-plored.The results show that the VAWT with a rear splitter flap at trailing edge can effectively improve the wind energy utilization rate and reduce the resistance of the airfoil.The wind energy utilization rate is higher than that of the original wind turbine under the low tip speed ratio condition,and the maximum in-crease in wind energy utilization is about 25.78%under the high tip speed ratio condition.The presence of the trailing edge flap is beneficial to the wake recovery of the VAWT,and the wake length of the VAWT with the trailing edge flap is shorter than that of the original wind turbine under the same tip speed ratio condition.
vertical axis wind turbine(VAWT)flow controlrear splitter flap at trailing edgeaerody-namic performanceutilization of wind energy
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