跨音速压气机叶栅中稠度对弯掠叶栅流场影响的数值分析

将一跨音速静叶栅数值计算结果与实验结果进行了比较,结果表明计算与实验结果吻合较好。为了讨论跨音速压气机中弯掠叶片的适用条件,在0°攻角下,稠度为1.75、1.50和1.25,对0~30°弯掠叶流场进行了数值分析,结果表明大稠度弯掠叶片的效果较为明显。弯掠叶片使前缘激波转化为斜激波,并减弱了通道激波的强度,因而降低了叶栅激波损失。可以验证在跨音速条件下稠度的大小是否在静叶栅中使用弯叶片的一个重要的参考因素。

A Numerical Analysis of the Impact of Solidity on Bowed and Swept Cascade Flow Fields in a Transonic Compressor Cascade

A comparison of the numerical calculation results of a transonic stationary cascade with test ones shows that the above calculation results are in relatively good agreement with the test ones. To discuss the applicable conditions of bowed and swept blades in a transonic compressor, a numerical analysis was conducted of the flow fields in bowed and swept blades having bending angles ranging from 0 degree to 30 degrees under a 0 degree incidence angle with the solidity being 1.75, 1.50 and 1.25 respectively. The numerical analysis results indicate that the effectiveness of bowed and swept blades with a high solidity is quite evident. The bowed and swept blades can transform the shock waves at the leading edge into oblique ones and meanwhile weaken the intensity of blade passage shock waves, thus diminishing cascade losses caused by shock waves. It can be verified that under transonic conditions, the magnitude of solidity is an important causative factor in determining whether to use bowed blades or not in stationary cascades.