Numerical Analysis of Flow and Ballistic Characteristics of High-speed Supercavitating Projectile in Cross-flow Environment

Abstract

In order to study the supercavitation morphological evolution and ballistic characteristics of underwater high-speed projectile under cross-flow, a numerical model of projectile in cross-flow environment was established based on VOF multiphase flow model,RNG k-ε turbulence model,Schnerr-Sauer cavitation model,6-DOF rigid-body model and overset mesh method. The supercavitation evolution of projectile, surface pressure distribution, velocity distribution of the surrounding flow field and hydrodynamic characteristics of projectile under 3 m / s, 6 m / s and 9 m / s cross flow conditions were analyzed. The results show that the supercavitation is no longer symmetrical due to the effect of cross-flow. With the passage of time, the supercavitation shape of the projectile increases asymmetrically, and the cavitation radius of the back side increases, while that of the oncoming side decreases. Under certain conditions,the tail of the projectile body will be wet. When the initial velocity of the projectile is the same,the larger the cross-flow velocity is,the larger the maximum head pressure is,and the closer it is to the head end of the oncoming side. The velocity attenuation trend of the projectile body in the direction of movement is basically the same at different cross-flow velocities,and the offset velocity in the direction of cross-flow increases with the increase of cross-flow velocity.