基于数值优化方法的离心压气机工作轮气动设计

将三维N-S方程流场计算、网格自动生成、Hicks-Henne函数叶型和子午面流道参数化与单纯形法寻优相结合,研究构成离心压气机工作轮自动优化设计软件。采用本文方法进行气动优化设计,流场计算要求有较高精度。对Krain工作轮的计算并与实验结果比较表明,流场计算程序具有令人满意的计算精度。在目标函数设定时,兼顾非设计点性能达到在设计转速下整个流量范围内的气动性能优化。采用所研制软件,对两个离心压气机工作轮进行优化设计,优化工作轮达到在压比近似不变的前提下效率有效提高。

Aerodynamic Design of Impeller Using Numerical Optimization Method

An automatic aerodynamic optimization system for centrifugal compressor impeller is constructed,which is composed of flow field simulations in 3D Navier-Stokes equation methods,grid automatic generations,parameterizations of blade profiles and meridional channels and optimization algorithms of SIMPLE method.It is mainly important that the flow fields are simulated with a certain precision,as to aerodynamic optimization design in this method.The flow field in the Krain impeller is simulated as an examination of flow field simulation accuracy.In construction of the objective functions,the non-design point performance is considered,to achieve the performance optimization in the whole work ranges of the impeller.Two impellers are redesigned using the optimization system.In the whole mass flow ranges at design rotating speed,the efficiency is improved obviously and the pressure ratio keeps nearly unchanged.