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.
发现了在接近喷嘴出口的区域里，出现了与射流内的激波、膨胀波有关的振荡流。
At the region near the nozzle exit, a vibrating flow phenomenon is found, which is associated with the expansion waves and shock waves reflections inside the gas jet.
根据改进的二阶激波-膨胀法提出了新的判据。
According to the improved second-order shock-expansion method, a new criterion is presented.
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