基于自由涡尾迹法和面元法全耦合风力机气动特性计算

Wind Turbine Aerodynamic Performance Prediction Based on Free-Wake/Panel Model Coupled Method

风力机气动特性主要由叶片贡献,但是处在流场下游的机身(包括机舱和塔架)对其也会产生影响。基于自由涡尾迹方法与面元法,得到了一个较为完备的风力机叶片与机身气动干扰的迭代计算方法。在该方法中,叶片用位于1/4弦线的一根升力涡线代替,结合叶片尾缘拖出的涡线建立自由涡尾迹模型,机身绕流模拟采用了一阶面元方法,将自由涡尾迹方法和面元法耦合模拟风力机主要气动特性。最后用该分析方法计算了NREL phaseVI风力机的气动特性,与实验结果进行比较和分析,验证了全耦合模型的有效性。

The aerodynamic performance of a wind turbine mainly depends on its blades.It is also influenced by its fuselage including nacelle and tower.A free-wake/panel model coupled method is presented to investigate the aerodynamic interactions of wind turbine rotor and fuselage.In this method,a free-wake model is established in which the blade is replaced by a lift line set at a quarter chord position and vortex filaments extend from the trailing edge of blade.One-order panel method is used to calculate the potential flow around nacelle and tower.Finally,the aerodynamic performance of the NREL phase VI wind turbine is calculated using the coupled algorithm and the results are compared with the experimental data for validation.