Study on hysteresis phenomenon in the acceleration phase of supercavitation vehicle

This paper aims to explore cavity shape variation regularity in the acceleration phase of supercavitating vehicle. According to the theory of Homogenous Equilibrium Flow, with Mixture Multiphase Model, by setting up the flow speed at the inlet boundary as a function of time, this study carried out the experiments for the supercavitation vehicle's numeral model and obtained the variation regularity of cavity shape, the viscous drag coefficient and the cavity hysteresis time when the supercavitating vehicle was in the phase of acceleration. Results show that when the vehicle is in the phase of acceleration, at the same cavitation number, the cavity size decrease with the increase of acceleration. With the decrease of cavity number, the effect of acceleration on cavity shape is smaller, but the viscous drag increases along with the increase of acceleration. On the condition when the velocity reaches equality uniform status, the cavity hysteresis decreases as the acceleration becomes smaller. On the condition of the same acceleration, the cavity hysteresis time decreases as the velocity increases.