风扇转子的气动优化设计研究

Aerodynamic Optimization for Fan Rotor Design Using Genetic Algorithm

风扇转子气动优化设计是结合CFD、遗传算法和风扇特性的跨学科自动设计方法,这种设计较少依赖经验,能实现多目标和多设计参数组合的优化设计。先研究了四个关键技术:具有耗时少、计算较准确的叶片通道流场数值计算方法;具有良好寻优能力的数值最优化方法;三维叶片造型的参数化方法;以气动性能为目标的多目标函数构建方法。再将上述四个关键技术模块整合,构建简易的气动优化设计软件。三维叶片优化算例证明了该软件的设计能力,其设计结果较满意、设计效率较高、设计周期短。

Numerical aerodynamic optimization is an automatic design method via computational fluid dynamics, optimization theory and fan characteristic. It can implement multi-objective optimization and multi-parameter combinatorial optimization with less dependency on designer’s experience. Fan design using numerical aerodynamic optimization focus on four key technologies： Fan blade passage flow field numerical method; Numerical optimization method with a good search capability; Parameterization description method of three-dimensional blade shape using Computer Aided Geometric Design Technology; The construction methodology of multi-objective function for aerodynamic performance. Software with friendly user interface is built by above four modules. 3D blade optimization examples verify that the design of the blade using this software are reliable and high-efficiency, it can shorten design period.