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The aim of this investigation is to develop the high performance vertical axis wind turbine (VAWT) with turbulence promoters. An angle of attack of turbine blades in VAWT changes from a plus to a minus broadly. Symmetric vortex generators are therefore required to develop the turbulence promoters for VAWT. A thin tripping wire introduces at upstream stagnation point as symmetric turbulence promoters. In order to evaluate an effect of the turbulence promoters, wind tunnel experiments and numerical simulations were carried out. As a result, turbulence promoter restrains the flow separation at high angle of attack. Lifting force is 38 % larger than that of conventional airfoil by using the turbulence promoter. It reveals that the turbulence promoter is effective device to improve performance of the VAWT.

Separation Control of an Airfoil at High Angle of Attack with Turbulence Promoters