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对风剪切和动态来流情况下NREL Phase VI风力机尾迹结构和气动性能进行计算。计算方法采用基于Weissinger-L升力面模型和时间推进自由尾迹模型的涡尾迹方法。应用所建立的方法对轴流工况时风力机的气动性能进行计算,并与实验数据进行比较,验证了模型的有效性。之后对不同来流风,包括稳态风剪切、极端垂直风切变和极端运行阵风时风力机的尾迹结构和气动性能进行计算。结果表明,风剪切使得叶片在旋转周期内经历变化的风速,导致尾迹结构不对称,叶片载荷随时间周期性波动;非稳态来流时,尾迹结构非对称性更明显,载荷波动更大,风力机疲劳载荷增加。计算结果能够为风力机优化设计提供支持。
NREL Phase VI wind turbine wake structure and aerodynamic performance are calculated for wind shear and dynamic inflow. The calculation method uses the vortex trail method based on the Weissinger-L lift surface model and the time-driven free-wake model. The aerodynamic performance of the wind turbine under axial flow conditions was calculated by using the established method and compared with the experimental data to verify the effectiveness of the model. Afterwards, the wake structure and aerodynamic performance of wind turbine in different winds, including steady-state wind shear, extreme vertical wind shear and extreme wind gusting were calculated. The results show that wind shear causes the blade to experience changing wind speed during the rotation period, resulting in asymmetry of the wake structure and periodic fluctuation of the blade load with time. When unsteady flow comes, the wake structure asymmetry is more obvious and the load fluctuation is larger , Wind turbine fatigue load increases. The results of the calculation can provide support for wind turbine optimization design.