The initial and final parameters of subsonic compaction wave alter continuously. The initial parameters of ultrasonic compaction wave are discontinuous, but its final parameters alter smoothly.
超音速压缩波的初态参数出现间断，但其终态参数却是连续变化的。
The starting process of wind tunnel, involving turbulence, shock wave, low subsonic and high supersonic mixing flows, is a very complex transient process.
超声速风洞的起动过程涉及到湍流、激波及低亚声速和高超声速混合流动，是一个非常复杂的瞬态过程。
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