偏航工况下风力机尾流特性分析

Analysis of Wake Characteristics for Wind Turbine under Yaw Condition

采用基于涡流理论的自由尾迹模型对风力机处于偏航工况下的尾涡结构进行计算,分析其对尾流特性的影响规律。结果表明:风力机偏航运行时,尾涡呈现出非对称的偏斜结构,且尾涡偏斜角大于偏航入流角;尾涡系中,叶片附着涡对尾流的诱导影响主要在轴向和径向方向,近尾迹涡及远尾迹涡对尾流的诱导影响主要在切向和径向方向;尾流区内流动以轴向流动和径向流动为主,尾流区外流动以轴向流动和切向流动为主。

The wake vortex structure of wind turbine under yaw condition is calculated by using free wake model based on vortex theory, and its influence on wake flow characteristics is analyzed. The results show that,（ a） when wind turbine is operated under yaw condition, the wake structure is skew asymmetric, and the skew angle is larger than the inflow angle;（ b）the bound vortices of wake mainly effect axial and radial velocity components, and near and far wake vortices mainly effect radial and tangential velocity components; and（ c） the flow inside the wake zone is mainly axial and radial flow, and the flow outside the wake zone is mainly axial flow and tangential flow.