关键词: 动力机械工程, 立轴风力机, 统一变桨距控制, 启动性能

Abstract: In order to improve the self-starting capacity of vertical axis wind turbine (VAWT), the variation of blade pitch angle, which is suitable for low tip speed ratio (TSR) cases, was proposed, and along with an actuator for collective pitch control which can change the blade pitch angle of multiple blades. A prototype was presented from the aspects of actuator of collective pitch control, airfoil selection, structure of wind wheel and control system, and then performance tests of prototype were implemented. The results show that the best thickness of symmetrical airfoil is 15%, while the maximum thickness of asymmetric airfoil is less than 10.4%; the theoretical data show good agreement with experimental data but is much higher than experimental data by 20%~30%; the results also show that it is effective to improve self-starting torque by increasing the frontal area of blade at downwind region of upstream.

Key words: Power machinery and engineering, Vertical axis wind turbine, Collective pitch control, Self-starting capacity