风力机钝尾缘大厚度翼型优化设计方法

Optimization design method for the large thick wind turbine airfoils with a blunt trailing edge

为了同时提高风力机大厚度翼型的气动性能和叶片的截面刚度,基于风力机翼型泛函集成理论和复合材料力学理论,提出了一种大厚度钝尾缘翼型优化设计方法,并建立了优化设计模型。该模型以翼型的气动性能最佳为设计目标,以叶片的最小截面刚度为约束条件,为某850 k W叶片(该叶片40%相对厚度处为DU00-W2-401翼型)优化设计了一种同厚度的新翼型—CQU-B-400。与DU00-W2-401相比,新翼型在光滑和粗糙条件下,气动性能均有较大提高;使用CQU-B-400翼型后,叶片的尾缘强度得到加强,叶片截面的挥舞刚度和摆振刚度也有一定的提高,表明新翼型能同时提高叶片的气动和结构性能。结果验证了所提出的大厚度翼型设计方法的可行性。

In order to simultaneously improve the thick airfoil＇s aerodynamic performance and the blade section stiffness,a method for the large thick wind turbine airfoils optimization design is proposed based on the wind turbine airfoil functional integrated theory and the mechanics of composite materials. The mathematical model of the airfoil optimization is established for the optimal aerodynamic performance,with a constraint condition of the least section stiffness. Using this method,a new airfoil named CQU-B-400 with the 40 % maximum relative thickness is designed for an 850 k W blade. Compared with the wind turbine airfoil DU00-W2-401,the new airfoil＇s aerodynamic performance is improved largely under both smooth and coarse conditions. With the new airfoil,the blade is improved in the strength of trailing edge,and the flap stiffness and shimmy stiffness are increased to a certain extent,showing obvious improvement in pneumatic and structural performances simultaneously. The study verifies the feasibility of this method in the wind turbine thick airfoil design.