射弹带攻角斜入水过程数值模拟研究OA

Supercavitating projectiles,leveraging their unique drag reduction mechanism,can maintain high speed and long range underwater.They have emerged as a pivotal development direction in fields such as underwater short-range defense,anti-torpedo operations,and underwater penetration.During high-speed oblique water entry,the initial angle of attack is one of the key factors influencing cavity evolution and ballistic stability.To investigate this effect,numerical simulations were conducted based on a three-dimensional unsteady flow field numerical model for projectile water entry.The simulations focused on oblique water entry conditions with a water entry angle of 60°,an entry velocity of 1 000 m/s,and an initial angle of attack ranging from-1.5° to+1.5°.The effects of initial water entry angles of attack on the flow field characteristics,hydrodynamic characteristics,and motion characteristics were analyzed.The results show that during oblique water entry of the supercavitating projectile,the cavitation exhibits slightly asymmetric characteristics.The coupling effect between the water entry angle of attack and cavitation asymmetry determines the extent of tail-fin cavity penetration.The angle of attack exerts a significant influence on the cavitation shape.When the angle of attack is controlled within±0.5°,a complete cavitation without being pierced can be formed.During the oblique water entry phase,the angle of attack mainly affects lift and pitch moment.Under a positive angle of attack,the impact of projectile tail on the cavitation wall generates additional drag.In the stable phase,the influence of the initial angle of attack gradually diminishes,the change in the projectile rotation angle can be neglected within a short period,and all hydrodynamic coefficients tend to stabilize.The research findings of this paper provide a theoretical reference for the water entry attitude control and structural optimization design of supercavitating projectiles.