中文摘要：

对水下超声速气体射流的动力学行为进行了实验研究．通过流动可视化揭示了回击现象的演化过程，利用探针排获得了射流近场区的脉动压力分布，实验结果表明：在超声速喷管出口两倍直径处，射流形貌的变化导致气体中出现了大幅值压力脉冲．通过流场可视化与压力测量的同步校验，证实了喷口端面处回击事件与流场气相区中压力脉动之间相关性．

英文摘要：

The paper presents an experimental study on the back-attack phenomenon in unuerwater supersonic gas jets. The development process of back-attack phenomena is visualized using a digital camera. The fluctuating pressure distributions in the near field of the jet are obtained by a row of probes. The experimental results indicate that, in the region two diameters of the nozzle exit downstream, the distortion of the gas jet results in the strong pressure pulse. Synchronization checkout tests have confirmed the correlation between the back-attack event and gas pressure pulsation.