Numerical Investigation the Effect of the Different Tip Vanes on the Loading of an H-VAWT

In this paper, the effect of the three typical tip vanes on the loading of an H-VAWT is investigated by employing the three-dimensional unsteady numerical simulation method. The results show that the both transient tangential force coefficient (C T ) and normal force coefficient (C n ) have obvious change when the winglet and the V type vane is used at the blade's tip, respectively. However, in three tip vanes, the C T average value is the lowest and the C T fluctuation characteristic is the highest when the winglet is used. Although the winglet and V type vane contribute to change the transient C T and C n , the normal force is increased too, it results in increasing fatigue loading and decreasing lifetime for H-VAWT. By comparison, the effect of the plate vane on the loading is weaker. Additionally, the winglet is advantage to improve power coefficient in the low tip speed ratio.

Abstract licence: CC BY

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