Possibility of Forming Periodic Pulsed Jets Using Cavitation Self-Oscillation Modes

The work studies cavitation self-oscillations which occur in a liquid flow in a pipeline with two resistances: the first is the cavitator, followed by an artificial ventilated cavity with an average pressure greater than atmospheric pressure, and through the second resistance (nozzle), liquid and gas flow out into the atmosphere. Experiments are carried out on a planar jet facility with transparent side walls for video recording. We research the possibility of using the mode of self-oscillations to create periodic pulsed jets at the outlet. The studies show that various frequency modes of self-oscillation can be implemented, with the mode of the first or second frequency modes being the most suitable for generating pulsed jets. It is demonstrated that the mode of intermittent liquid outflow from the nozzle occurs at a rather high average pressure in the cavity. The maximum pressure in the area of collision with the obstacle significantly exceeds both the average pressure of the head and the maximum pressure in the cavity.