多级轴流压气机S_2正问题气动性能优化

Aerodynamic performance optimization on S_2 analysis code of multi-stage axial compressor

将求解多级轴流压气机特性的S2正问题计算程序集成在ISIGHT优化软件上,构建压气机S2正问题气动性能优化平台.针对某4级轴流压气机,通过调整沿径向截面的叶栅弯角、叶栅稠度、叶型最大相对厚度等参数,考核设计几何参数对S2正问题计算效率目标函数的影响程度,择优选取设计参数作为优化变量,建立响应面模型,结合遗传算法,对目标函数进行优化.结果显示压气机特性整体提高,设计点压比增加19.6%,效率提高4.66%,折合转速1.0下的稳定裕度增大到22.32%,验证了构建优化平台在压气机气动设计中的实用价值,可供内流叶轮机气动性能优化设计参考.

An aerodynamic performance optimization platform was established for S2 analysis code of compressor by integrating the ISIGHT optimization software and S2 analysis code which calculated performance of multi-stage axial compressor.When a four-stages axial-flow compressor was optimized,the parameters were selected by adjusting blade camber angle,solidity,relative maximum thickness and so on,along radial which have more influence on the objective function just like efficiency to establish the response surface model and integrated evolutionary algorithm to optimize the objective function.The result shows that the whole characteristic of compressor improves,pressure ratio increases 19.6% and efficiency increases 4.66% at design point,stall margin increases to 22.32% at 1.0 equivalent rotor-speed,which proves that building optimization platform has practical value for aerodynamic design of compressor,and can be reference for aerodynamic performance optimization of inner flow tubromachinery.