一种新型结构叶片对风力机气动性能的影响

针对风力机在旋转过程中产生的叶尖涡影响风力机本身以及下游风力机气动性能的问题,提出了一种控制叶尖涡的策略,以减小叶尖涡对风力机本身及下游风力机气动性能的影响.以PhaseⅥ叶片的1/8模型为原始模型,在叶尖处和轮毂处同时开洞,用管道将洞连接的模型称作新模型.采用数值模拟的方法对来流风速从6 m/s到20 m/s的15个工况下原始模型和新模型风力机进行了对比分析,结果表明:在低风速下原始模型和新模型气动性能几乎一样,即新模型对叶片气动性能影响很小,尾流扩散速度也相近;但随着来流风速的增大新模型对风力机气动性能的影响也随之增大,新模型风轮功率比原始模型风轮功率有明显提高,尾流在风轮旋转平面内扩散速度变快,在来流方向传播距离变短.新模型尾流可以减小对下游风力机的影响,提升了风电场风能的利用效率.

Effect of blade with new structure on aerodynamic performance of wind turbine

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.