Influence of the Cavitator and Nozzle Parameters on the Efficiency of Operation of a Generator of Pulsed Jets

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.