H型垂直轴风力机远场尾流特性研究

基于非定常CFD数值模拟方法,采用FLUENT软件对H型垂直轴风力机的流场进行模拟,并分析尖速比和叶片数对远场尾流特性的影响规律。结果表明:风轮在运转过程中的空气流动近似于圆柱绕流,绕流和旋转对尾流两侧风速具有增大作用,增大的风速不断汇入到尾流中,有助于尾流风速恢复;随着尖速比的增大或叶片数的增多,远场尾流形成卡门涡街,尾流风速呈周期性上下波动分布;在风电场中风力机组的排布应根据不同的尾流特性,采取不同的布置方案。

Study on Far-field Wake Characteristics of H-type Vertical Axis Wind Turbine

Based on unsteady CFD numerical simulation method, the flow field of H-type vertical axis wind turbine is researched, the impact of tip speed ratio and blade number on far-field wake characteristics are analyzed. The results show that the airflow during the operation of the wind wheel is similar to cross-flow around a circular cylinder, and cross-flow and rotation have increased the wind speed on both sides of the wake. The increased wind speed continuously merges into the wake, which is conducive to the recovery of wake wind speed. With the increase of tip speed ratio or blade number, the Karman Vortex Street is appeared in the far-field wake, and the wake wind speed fluctuates periodically. The layouts of wind turbines in wind farm should adopt corresponding schemes based on different wake characteristics.