在二维超音速混合层入口处引入T S波及其亚谐波 ,对扰动的空间演化进行了数值模拟 .研究了由扰动引发的小激波 (shocklet)的强度与入口处扰动幅值的关系 .分析了激波前后扰动速度剖面的变化 ,发现小激波的存在对扰动速度剖面有显著影响 ,而高速层和低速层中激波对扰动速度作用不同 The TS wave and its subharmonics are introduced at the entrance of the two-dimensional supersonic mixing layer, and the spatial evolution of the disturbance is numerically simulated. The relation between the intensity of the shocklet caused by the perturbation and the disturbance amplitude at the entrance is studied. The changes of the perturbation velocity profile before and after the shock wave were analyzed. It was found that the existence of the small shock wave had a significant effect on the perturbation velocity profile, while the shock wave in the high-velocity and low-velocity layers had different effects on the disturbance velocity