To relieve the negative impact of flow seperation at trailing edge of flap on the aerodynamic performance of vertical axis wind turbine(VAWT),a backward flap was installed on the blade trailing edge.According to different flow control strategies,the aerodynamic performance of trailing edge was im-proved.A two-dimensional numerical simulation of VAWT blades was conducted using CFD software STAR CCM+,and the effects of backward flap on wind energy utilization rate,blade average torque and flow characteristics of VAWT under different working conditions were studied.The research results show that the wind energy utilization rate has been significantly improved at the optimal tip speed ratio.When the tip speed ratio is 2.5,the wind energy utilization rate is 38.7％higher than that of original wind tur-bine.In addition,the blades with backward flaps have a larger stall angle of attack,and stall phenomena are delayed and only occur at higher angles of attack.
维普
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