Abstract: Aiming at the problem that the blade tip vortex generated during the wind turbine affects the aerodynamic performance of the wind turbine itself and the downstream wind turbine, a strategy for controlling the blade tip vortex is proposed to reduce its impact. The 1/8 model of the Phase Ⅵ blade was used as the original model. new model was made on the basis of that, which holes were opened at the blade tip and the hub at the same time and connected with pipes. The numerical simulation method was used to compare and analyze the wind turbine in original model and the new one under 15 conditions of incoming wind speed from 6 m/s to 20 m/s. The results show that the aerodynamic performance of the original model and the new one are almost the same at low wind speeds, that is, the new model has little effect on the aerodynamic performance of the blades, and the wake diffusion speed is similar. But as the incoming wind speed increases, the impact of the new model on the aerodynamic performance of the wind turbine also increases. The power of the new model wind turbine is significantly higher than that of the original model,and the wake spreads faster in the rotation plane of the wind turbine. The propagation distance in the incoming direction becomes shorter. The new model wake can reduce the impact on downstream wind turbines and improve wind energy utilization efficiency of wind farm.

Key words: wind turbine, new structure blade, numerical simulation, tip vortex, power, wake