Water entry simulation analysis of a truncated projectile

In order to explore the influence of the bevel angle of the projectile on the vertical velocity attenuation characteristics and cavitation of the projectile after it enters the water vertically, this paper uses numerical simulation to analyze the bevel angles of 45°, 30°, 25° and 20°. At the same time, the high-speed camera is used to study the vertical penetration of the projectile with a 45° bevel angle to verify the simulation model. The research results show that the vertical velocity decays exponentially, and the trajectory of the truncated projectile is bent after entering the water so that an asymmetric open cavitation occurs. The bevel angle will affect the degree of trajectory curvature, velocity attenuation and the shape of the cavity. The larger the bevel angle, the greater the degree of trajectory curvature; the smaller the bevel angle, the slenderer the cavity and the smaller the asymmetry.