Abstract

The regime of cavitation self-oscillations in a hydraulic system that contains a ventilated cavity with a negative cavitation number is used to create a generator of periodic impulse jets. The influence of the parameters of cavitator and output nozzle of the generator on the intensity of the impact of liquid outflowing on an obstacle (shield) located perpendicular to the direction of jet outflow is studied. It is found that increase in the nozzle length can significantly increase the efficiency of the generator, and a smooth constriction of the channel ahead of the cavitator can help to increase the operating range of the generator in the direction of larger gas blows. It is shown that there is a scale effect, namely, the relative intensity of self-oscillations decreases with increase in the liquid head pressure; however, it tends to reach a horizontal asymptote.

中文翻译：

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空化器和喷嘴参数对脉冲射流发生器运行效率的影响

摘要

包含具有负空化数的通风腔的液压系统中的空化自振荡状态用于创建周期性脉冲射流发生器。研究了发生器的空化器和输出喷嘴的参数对流出液体对垂直于射流流出方向的障碍物（护罩）的冲击强度的影响。研究发现，喷嘴长度的增加可以显着提高发生器的效率，而空化器前面通道的平滑收缩有助于增加发生器在较大吹气方向上的工作范围。结果表明，存在尺度效应，即自激振荡的相对强度随着液头压力的增大而减小；然而，它往往会达到水平渐近线。