Abstract: An experimental study was presented to find out the formation mechanism of initial shock wave The generation and development of this phenomena was studied, and the results could be used as a reference for decrement of the harmf shock wave Laser Moire Deflectometry instrument was used in this experiment to display the formation of the initial shock wave field In the meantime, piezoresistance pressure transducers were used to measure the shock wave overpressure Through analysis of the experiment results gotten by these two methods, the physical essence of initial shock wave and its general development rules were deduced In near field, the overpressure is harmful to loading equipment

Key words: Nozzle flow;Jet flow;Blast

摘要： 利用实验研究的方法对燃气射流起始冲击波的形成机理进行研究。目的在于研究其发生、发展的规律 ,为寻求降低其危害性的研究提供参考。实验中使用了激光 Moire偏折仪对起始冲击波场的形成初期进行了光学显示 ,同时还使用了压阻式压力传感器对起始冲击波超压进行了测量。通过对测量结果的分析 ,认识了燃气射流起始冲击波的物理本质且总结出其形成和发展的一般规律 ,它在近场的高峰值超压对火箭武器的承载设备具有破坏作用

关键词: 喷管气流;射流;冲击波