Formula for upstream pressure, nozzle geometry and frequency correlation in shedding/discharging cavitation clouds determined by visualization of submerged cavitating Jet

摘要

Visualization of high-submerged cavitating water jet was done by a high-speed camera photography in order to study and understand the jet structure and the behaviour of cloud cavitation within the time and space. The in uencing parameters, such as: injection pressure, nozzle diameter and geometry, nozzle direction (convergent and divergent) were experimentally proven to be very significant. Periodical shedding and discharging of cavitation clouds has been also analysed and corresponding frequency was determined by clouds shape analysis. Additionally, dependence of this frequency on injection pressure and nozzle geometry has been analysed and a simple formula of correspondence has been proposed. The formula has been tested on self-measured and literature data.