平底后缘风力机翼型的优化设计

DESIGN AND NUMERICAL OPTIMIZATION OF FLATBACK AIRFOILS

应用基于代理模型的优化方法对35%相对厚度、后缘安装隔板的平底后缘风力机翼型进行优化设计。基于雷诺平均Navier-Stokes方程,采用耦合γ-_(eθ)转捩模型的SST k-ω湍流模型,对平底后缘翼型绕流进行数值模拟得到翼型的气动性能。以翼型在大迎角下的升力系数和截面惯性矩为目标,阻力系数和力矩系数等为约束,对平底后缘翼型进行优化设计;结果表明,优化后翼型在满足约束条件的同时,迎角17°时,升力系数提高8.53%,最大升力系数较基准翼型提高3.13%,截面惯性矩较基准翼型提高7.84%。

An aerodynamic optimization design method based on the surrogate model was used for design and numerical optimization of the flat back airfoil of wind turbine with a splitter plate at the trailing edge. The aerodynamic property of the airfoil was obtained by numerically simulating flow around flat back edge airfoils and by solving the Reynolds-averaged Navier-Stokes equation in which the SST k-to turbulence model coupling T-Reθ transition model was employed. In this optimization process, the sectional moment of inertia of the airfoils and the lift coefficient at high angle of attack were taken as two objectives, while the drag and moment coefficients and some other properties were taken as constraints. The results show that the lift coefficient at the angle of attack of 17° is increased by 8.53%, the maximum lift coefficient is increased by 3.13%, and the sectional moment of inertia is increased by 7.84%, while the optimized flat back airfoil meets all the constraints.