A Study of Cavitation Control in Submerged Water Jet

This paper deals with a possibility of the control of cavitation in submerged water jet. A cylindrical type of cavitator is set in nozzle in order to generate vortex ring cavitation in the near wake region of the cavitator. Cavitation intensity is controlled by changing the length of the cavitator, with which the thickness of boundary layer at the trailing edge of the cavitator and the size of vortex ring are concerned. It is clarified that the present method can control effectively cavitation intensity and that there are great differences in impulse force depending on the standoff distance and the cavitator length. Impulse force in cavitation-controlled conditions is of the magnitude of three times lager than that in uncontrolled ones.