根据激波理论，爆炸产生压力脉冲并以压力波的形式传播，既有压缩波也有膨胀波。
According to the shock theory, the ejecta produced by explosion form the pressure pulse, and it spreads in forms of either compression waves or expansion waves.
通过数值计算，得到了喷嘴出口自由射流与冲击射流情况下的流体速度、压力等参数分布情况，及这两种流场中的激波位置。
Through the numerical simulation, the distribution of those parameters such as speed, pressure of the free jet and impinging jet flow is obtained, also the position of shocks.
结果表明，被动控制使得沿模型表面的马赫数峰值及过压力梯度明显减小，激波减弱。
The results indicate that passive control technique can reduce peak Mach number on the surface of the airfoil and reduce the adverse pressure gradient, shock is also weakened.
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