LAUSR

We conduct an experimental study of the ventilated supercavitation generated from gas jet cavitator [gas jet ventilated supercavitation (GJVS)] over a broad range of ventilation and flow conditions for two gas jet nozzle sizes. The experiments show that supercavity evolves across different cavity regimes with distinct patterns, i.e., bubbly flow, Stable Cavity (SC), Unstable Cavity (UC), and Jet Cavity (JC) with increasing ventilation rate. The supercavity transition is shown to be a result of the stagnation location of gas jet shifting from the potential core zone to the established turbulent flow zone of the jet as ventilation increases. The variation of supercavity regimes under a broad range of Froude numbers is compiled, and the map of supercavity regime transition shows similar trends for different Froude numbers and nozzle sizes. Compared to a disc cavitator, in the SC regime, the GJVS exhibits similar ventilation hysteresis with a significantly higher ventilation demand for the formation of a supe...