风力机翼型气动性能混合计算方法的研究

A Hybrid Solver for Aerodynamic Performance of Wind Turbine Airfoils

基于流场有黏-有势混合求解的概念,将雷诺平均N-S方程(RANS)与面元法相结合,独立开发了流场分区混合数值计算程序(HNSP),用于风力机翼型气动性能计算.以风力机专用翼型S814为例,采用开发的HNSP法、势方程耦合边界层方程的Xfoil程序及单独求解有黏流动的RANS方法,计算了其在0°～20.2°攻角范围内的气动性能和流场分布,并与试验结果进行了对比,探讨了黏性计算域范围对计算结果准确性和计算时间的影响.结果表明:该文开发的流场有黏-有势混合计算程序HNSP可在较大的攻角范围内较准确地模拟风力机翼型流场和气动特性,具有较好的适用性,且相对于全黏计算,可有效节省计算资源和时间.

Based on the viscous-potential flow models, a hybrid solver for calculation of aerodynamic performance of wind turbine airfoils has been developed combining the Reynolds-averaged Navier-Stokes （RANS） equations for the viscous flow and the potential-based panel method for the inviscid flow. Taking S814 airfoil specially designed for wind turbines as an example, its aerodynamic performance and flow field were calculated within an attack angle of 0°-20.2° respectively using the newly developed hybrid solver, the Xfoil program and the RANS method. The calculated results were compared with that of experiments, while influence of calculation domain on the calculation accuracy and time studied. Results show that the newly developed HNSP method can accurately simulate the flow field and aerodynamic characteristics of wind turbine airfoils in a relatively large range of attack angles, with which significant computing resources and time can be saved comparing with those required by Navier-Stokes solver alone.