【摘要】 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。更多还原

【Abstract】 An investigation of the effect of steady wind shear and transient dynamic inflow wind on the wake structure and performance characteristics of a horizontal axis wind turbine rotor was presented.A computational method based on Weissinger-L lifting surface model with a time-marching free vortex methodology was used for this purpose.The code was validated using the experimental data obtained from the NREL UAE experiments.Three different inflow cases,i.e.steady wind shear,transient extreme wind shear(EWS) and extreme operating gust(EOG),were investigated.The results show that the existence of the wind shear in the freestream can create substantial asymmetries and non-periodicities in the structure of the wake,also airloads on each blade element vary in time.In addition,the blades get subjected to high amplitude fluctuations in low speed shaft torque when wind turbine suffers unsteady dynamic inflow.The results can provide support for optimal design of wind turbines.更多还原