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将风力机翼型气动性能与气动噪声同时作为翼型优化目标,建立了低速翼型的多目标优化设计方法,包括利用Bezier曲线对翼型几何结构进行参数化建模,使用位势流动与边界层迭代(IBL)的流动分析方法计算翼型流场,采用Brooks-Pope-Marcolini翼型自噪声半经验模型预测气动噪声,利用Powell优化方法求得优化翼型.以naca0012翼型为例,对多种目标权重分配方案的优化目标进行设计和计算.结果表明:与原始翼型相比,在设计工况下,优化翼型的升阻比提高,噪声降低,可以获得更好的气动性能和声学性能.
The airfoil aerodynamic performance and aerodynamic noise are simultaneously used as airfoil optimization objectives. A multi-objective optimization design method for low-speed aerofoils is established. The method includes parametric modeling of airfoil geometry using Bezier curves, Layer flow iteration (IBL) is used to calculate the airfoil flow field, the aerodynamic noise is predicted by the Brooks-Pope-Marcolini airfoil self-noise semi-empirical model, and the optimized airfoil is obtained by the Powell optimization method. Taking the naca0012 airfoil as an example, The results show that compared with the original airfoil, under the design conditions, the lift-drag ratio of the optimized airfoil can be improved and the noise can be reduced, so that better aerodynamic performance can be obtained. Acoustics.