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建立适合于水平轴风力机气动特性分析的自由尾迹计算方法。该方法中,桨叶模型采用Weissinger-L升力面模型,转子自由尾迹的求解采用时间推进方法,数值求解方法采用4阶Adams-Moulton预估–校正算法以提高计算精度。应用所建立的方法对模型风力机处于轴向来流工况时的尾迹形状和气动特性进行计算,并与文献实验数据进行比较,验证了该方法的有效性。最后计算了来流风偏转和桨叶桨距角增加时尾迹形状的非定常畸变及气动载荷特性,得出一些有意义的结论。
To establish a free wake calculation method suitable for aerodynamic characteristics analysis of horizontal axis wind turbine. In this method, the model of Weissinger-L lift surface is adopted as the blade model, the time advance method is used to solve the rotor free wake, and the fourth-order Adams-Moulton estimation and correction algorithm is used to improve the calculation accuracy. The proposed method is used to calculate the wake shape and aerodynamic characteristics when the model wind turbine is in the axial flow condition and compared with the experimental data to verify the effectiveness of the method. Finally, unsteady distortion and aerodynamic load characteristics of the wake shape when the flow wind deflections and blade pitch angles increase are calculated. Some meaningful conclusions are obtained.