中文摘要：

本文针对离心压气机叶片的倾和掠的特征，建立三维气动优化设计系统。采用NURBS曲线和曲面分别对离心压气机叶片前缘基迭线和中弧面进行参数化建模，相应控制点作为优化设计变量，以提高不同工况下离心压气机的整级效率为优化目标，同时采用变复杂度模型的优化策略缩短优化设计周期。算例结果表明这种离心压气机叶片三维气动优化设计方法对提高整级效率具有良好效果。

英文摘要：

In the present paper, three-dimensional aerodynamics optimization design system is established for lean and sweep features of blades in centrifugal compressor. NURBS curve and surface are employed for parametric modeling the leading stacking-line and camber-surface of blade in centrifugal compressor. Control points as optimized design variables, isentropic efficiencies of different operating points as optimized objectives, variable complexity model is used to shorten the optimizing design cycle. The practical result of this method on a centrifugal compressor stage design indicates obvious improvement.