本文研究的冲压叶栅基于激波增压这一思想,在冲压叶栅内组织了多道斜激波及一道结尾正激波,来实现叶栅的增压效应。采用雷诺平均N-S方程和Menter-SST湍流模型,对冲压叶栅的流场进行数值模拟。数值模拟结果表明,来流气流角在37°与49°之间变化时,冲压叶栅波系可以稳定存在,并且随着来流气流角增大,叶片通道内分离趋于严重,且有竹节波产生,使得叶栅流动分离损失及激波损失加剧,等熵效率降低。 In this paper, based on the idea of ​​shock compression cascade ramjet ramification cascade in the organization of a number of oblique shock wave and a positive shock at the end, to achieve cascade supercharging effect. The Reynolds-averaged N-S equation and the Menter-SST turbulence model were used to simulate the flow field of the ramjet cascade. The numerical simulation results show that the ram cascade can stably exist when the air flow angle changes between 37 ° and 49 °, and the separation becomes more serious with the increasing of the air flow angle. Festival waves generated, making the cascade flow separation loss and shock loss increased, the isentropic efficiency decreased.