考虑转捩影响的风力机翼型气动特性计算研究

Calculation of aerodynamic performance of wind turbine airfoil incorporating transition prediction

基于二维雷诺平均Navier-Stokes（RANS）方程，耦合e^N数据库方法进行流动转捩判断，采用SA湍流模型计算了风力机专用翼型DU91-W2—250的气动特性，得到了雷诺数Re=1．0×10^6时，攻角在-11°～12°范围内该翼型的升力和阻力特性曲线及压力分布。通过对全湍流计算结果、耦合转捩判断的计算结果及实验数据的对比，表明考虑转捩因素后的计算结果与实验结果吻合更好，说明要准确模拟风力机翼型的绕流，必须考虑转捩影响。

Based on two dimensional Reynold Averaged Navier-Stokes（RANS） equations coupled with the e^N database method to predict transition, the SA turbulence model was applied to calculate the aerodynamic performance of wind turbine dedicated airfoil DU91-W2-250 of Reynold number 1.0×10^6. The coefficients of lift and drag as well as the pressure distribution were computed with the airfoil＇s angle of attack changing from -11° to 12°. The comparison between fully turbulent calculation, computed results incorporating transition prediction and experimental data showed that transitional predicted results were closer to the experimental values. It＇s necessary to take transition into account in order to simulate the flow around wind turbine airfoil more accurately.