基于Kriging模型的旋翼翼型优化设计研究

Research of rotor airfoil design optimization based on the Kriging model

  • 摘要: 以基于进化算法的多目标优化方法为基础,结合多目标优化设计Pareto解的思想和约束处理机制,采用Kriging代理模型和基于B样条的翼型表示方法,建立了旋翼翼型的优化设计系统。代理模型采用均匀设计进行模型采样,在优化过程中根据EI(expected improvement)准则动态增加采样点来调整代理模型的精度。采用B样条方法进行翼型参数化,保证了翼型的光顺性。在翼型的气动性能分析中引入转捩模型提高阻力计算的精度。利用该系统对旋翼翼型进行了优化设计,经风洞试验验证,满足设计要求。

     

    Abstract: The rotor airfoil design has the characteristics of multipoint, multiobjective and strong constraints. Based on the evolutionary multiobjective optimization method, Kriging method and Bsplines airfoil shape parameterization method, combined with the concept of Pareto optimality and constrainthandling mechanism, a rotor airfoil design and optimization system is built. In Kriging model the sample points are selected by using the uniform design, and the accuracy of the model is adjusted by the Expected Improvement criterion during the optimization procedure. The airfoil is parameterized by using the Bspline definition which has good flexibility. The airfoil performance is evaluated using NavierStokes code, and the transition model was added into the code to improve the computation accuracy of drag. The rotor airfoil design is studied using the design system, and the optimized airfoil was tested in a tunnel. The results show that the aerodynamic performance of optimized airfoil has been improved significantly, and the feasibility if the optimization method is valideted.

     

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