叶片数对VAWT-SWS低风速自起动性能的影响

Effects of Blade Number on Self-starting Performance of Vertical Axis Wind Turbine with Self-adapting Wind Speed under Low Wind Speed

为探明叶片数对自适应风速垂直轴风力机(VAWT-SWS)自起动性能的影响,设计了可更换叶片个数(2,3,4)的风力机模型,通过风洞实验获得了3 m/s风速下风力机的静态转矩系数随方位角变化曲线,并与相同参数的Darrieus直叶片风力机(D-风力机)进行了对比。之后使自适应风速垂直轴风力机空载,得到了3 m/s风速下其转速随时间变化曲线。实验结果表明:自适应风速垂直轴风力机的自起动性能优于Darrieus直叶片风力机,增加叶片数可使自适应风速垂直轴风力机的静态自起动性能提高,但使动态自起动性能降低。

With the aim to investigate the influences of blade number on the self-starting performance of vertical axis wind turbine with self-adapting wind speed （VAWT-SWS）, a prototype which could change the number of blades （2,3,4） was designed. Through the wind tunnel experiment the static torque coefficient curve with azimuth angle at a wind speed of 3m/s was obtained, and compared experiments were done on Darrieus straight-bladed wind turbine with the same parameters. Then the load of VAWT-SWS was released, and rotation speed curve of VAWT-SWS changing with time at 3m/s was gotten. The experimental results showed that the self-starting performance of VAWT-SWS was superior to that of Darrieus straight-bladed wind turbine; the increase of blade number could improve the static self-starting performance of VAWT-SWS, but degraded the dynamic self-starting performance.