风力机翼型尾缘加厚修型优化

OPTIMIZATION OF ENLARGING THE THICKNESS OF AIRFOIL'S TRAILING EDGE FOR WIND TURBINES

为实现风力机专用翼型尾缘加厚修型优化,并实现优化过程的自动运行,采用ISIGHT多学科设计优化软件平台,针对钝尾缘翼型的运行特点,用切向和法向载荷系数描述翼型气动性能,基于指数混合函数法,提出翼型尾缘对称和非对称加厚优化问题,以尾缘加厚厚度为优化变量对风力机专用DU91-W2-250翼型的尾缘进行对称和非对称加厚修型优化。在ISIGHT软件平台上集成翼型生成、ICEM网格划分、Fluent流场计算、载荷计算以及遗传算法优化计算模块。优化结果表明,翼型尾缘对称和非对称加厚优化后其代表风力机叶片出力能力的切向载荷获得明显提高。翼型尾缘对称加厚优化的效果优于尾缘非对称加厚的情况。

The MDO （Multidisciplinary Design Optimization） tools of ISIGHT were applied to perform the optimization design of enlarging the thickness of airfoil＇ s trailing edge for wind turbines automatically. A method called mixed function of index was used to enlarge DU91-W2-250 airfoil＇ s trailing edge symmetrically and asymmetrically, the enlarged thickness of trailing edge was chosen as the optimization variable. So the optimization problem was put forward For the operating conditions of blunt trailing edge airfoils at the root part of wind turbine blade, this optimization was carried out. There are five modules integrated on the platform of ISIGHT, which are airfoil generation, grid generation, flow field computation, load calculation and optimization based on genetic algorithm. Optimization results showed that the tangential load of airfoil increases obviously after enlarging the thickness of airfoil＇ s trailing edge. The optimization results of enlarging the airfoil＇ s trailing edge symmetrically are better than that of enlarging the airfoil＇ s trailing edge asymmetrically.