Abstract
High-speed video observations of cavitating jets issuing from sheathed nozzles at the injection pressure of 5 MPa and the cavitation number of 0.03 are carried out to clarify the behavior of cavitating jet. Two types of nozzle A4 and A4-R are used in the experiments. Water jet into air issued from the nozzle A4 appears to be compact one, but that issued from nozzle A4-R disintegrates at relatively short standoff distance and disperses downstream. Image analyses of the videos are conducted and the relation between cavitation clouds discharged from the sheath outlet and the flow structure inside the sheath is investigated.
