Research on hydrodynamic characteristic of supercavitating vehicle in vibrational state

Based on the Rayleigh-Plesset homogeneous hypothesis and the compressible Mixture multiphase model, numerical simulation of cavitation flow in the simple harmonic vibrational state of supercavitating vehicle enveloped with cavity was performed in moving coordinate system. The law of changes of the vehicle´s hydrodynamic characteristic was analysed. Also, a comparative study of influence of vibration frequency and amplitude on the vehicle´s hydrodynamic force coefficients was carried out. Results have showed that in the simple harmonic vibrational state, the vehicle´s hydrodynamic force coefficients change periodically. The increment of vibration frequency and amplitude will cause drag force and lift force to increase, and intensify the amplitude fluctuation of drag coefficient and lift coefficient. The conclusion of this paper can afford theory basis for the further researching on trajectory performance and control method of supercavitating vehicle.