Surge instability on a cavitating propeller

摘要: The present study details results from experiments investigating a surge instability on cavitating propeller. Initially, the stable behavior of propeller is explored, and nature extent cavitation documented at various experimental conditions, including yaw. first explored through visual observation blades in tip vortices. Particular note made similarities between re-entrant jets that noted by other investigators. It also observed closely related to partial cavity single, two-dimensional hydrofoils. flow conditions lead are determined it shown onset corresponds specific configuration attached lengths an individual blade. Pressure measurements obtained transducers within facility, acoustic signature identified. magnitude fluctuating pressures very large, presumably capable producing severe hull vibration. A simple model developed based volume estimates high speed video footage, predictions compared with experimentally pressures. To assess significance surrounding facility initiating sustaining instability, for dynamics. this then response volumetric excitation imposed oscillating piston. quantify fluctuations test section quasistatic compliance mass gain factor These parameters have previously been employed developing system transfer functions pumps. Finally, complete system, incorporating both predicts active dynamics therefore potentially unstable two distinct frequency ranges, one such range hypothesized correspond instability. ability predict characteristics evaluated.