上游风力机偏航对于下游风力机气动特性的影响

Aerodynamic characteristics analysis of downstream wind turbine considering yaw of upstream wind turbine

针对倾斜尾迹导致下游风力机受到不平衡的气动载荷,疲劳载荷显著增加的问题,文章基于FAST.Farm开源软件,研究了在NREL 5 MW风力机错列布局下,上游风力机偏航对于下游风力机气动特性的影响。研究结果表明:随着上游风力机偏航角度的增加,下游风力机逐渐处于尾流风速亏损的核心区域,其风轮输出功率的减少量显著增大,风轮所承受的推力逐渐降低;相较于上游风力机未偏航的情况,当上游风力机偏航角度为40°时,下游风力机叶根处倾覆力矩的标准差增加了50.5%,波动性显著增大。该研究结果可为整场控制协同优化和偏航入流下的风力机气动特性分析提供参考。

The downstream wind turbines suffered by the deflected wake are subjected to unbalanced aerodynamic loads and resulting in a significant increase in fatigue loads.Two NREL5 MW wind turbines have been adopted to study the influence of the yaw control of upstream wind turbine on the aerodynamic characteristics of downstream wind turbine under staggered arrangement,based on open source software FAST.Farm.The results show that the downstream wind turbine is gradually in the core area of wind velocity deficit with the increase of yaw angle of the upstream wind turbine,the reduction of rotor power of the downstream wind turbine is significantly increased,and the rotor thrust suffered by the downstream wind turbine is gradually reduced.The yaw control of the upstream wind turbine will significantly affect the fluctuation characteristics of the aerodynamic load of the downstream wind turbine.When the yaw angle of the upstream wind turbine is 40 °,the standard deviation of the flapwise moment at the blade root of the downstream wind turbine increases by 50.5% compared with the case that the upstream wind turbine is not yawed.This study can provide a reference for the whole wind farm control collaborative optimization and aerodynamic characteristics analysis under yaw inflow.