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.
为了揭示低压大流量下自激振荡脉冲射流清洗的脉冲发生机理，研究了这种工况下喷嘴结构和运行参数的优化设计范围。
To explain the generative mechanism of low pressure and mass flow self-excited oscillation pulsed jet, the nozzle optimized design range of structure and operation parameters was investigated.
虽然串联喷嘴阻力损失的增加，使射流平均能量有所降低，但射流的瞬时能量得到了调制，激励出更大的流体振荡。
Although the resistance force increase of series nozzles makes the average energy of jet flow decreased but it lets the instantaneous energy modulated to impel more fluid resonances.
实验还表明，自激振荡脉冲喷嘴射流存在最优喷距，最优喷距的大小为喷嘴出口直径的7～14倍。
The optimum jet distance for jet pressure pulsation was about 7-14 times of nozzle exit diameter.
在理论和实验研究的基础上，设计了几种用于牙轮钻头的自激振荡脉冲喷嘴，在常压下进行了射流脉冲压力测试和冲蚀天然红砂岩的实验。
A number of self-excited resonant pulse jet nozzles for deep hole bits were designed on the basis of theoretical analysis and experimental results.
在理论和实验研究的基础上，设计了几种用于牙轮钻头的自激振荡脉冲喷嘴，在常压下进行了射流脉冲压力测试和冲蚀天然红砂岩的实验。
A number of self-excited resonant pulse jet nozzles for deep hole bits were designed on the basis of theoretical analysis and experimental results.
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