Study On The Process Of Water Missile Crossing Medium

The high-speed entry of torpedoes or projectiles into the water is a very complicated problem,which involves the three-phase coupling of gas,liquid,and solid.When the speed of the projectile is high,the cavitation of water needs to be considered.During the high-speed entry of the projectile into the water.Firstly,the projectile will hit the water surface,and a huge impact load will be generated immediately after impacting the water surface.Subsequently,a water-filled air bubble will be formed,and the projectile will move forward stably with the air bubble,and the load of the bullet body will be reduced first and then stabilized.Research on the process of the projectile’s entering the water can effectively provide guidance for the design of anti-submarine weapons.In this paper,numerical simulation and theoretical analysis are used to calculate the water entry process of the supercavitating projectile.The main research contents are as follows:Based on STAR-CCM,a numerical calculation model of the projectile’s water-entry process was established,and the calculated results were compared with relevant experimental results to verify the accuracy of the numerical calculation model.The number of different grids,time steps and calculation domains were calculated.Finally,suitable parameters were determined,and the process of the projectile’s high-speed tilt into the water was analyzed.The high-speed water entry of the projectile was studied from four aspects: the water entry angle,the water attack angle,the initial speed,and the head shape.This paper mainly discusses the kinematics of the projectile,the surface pressure of the projectile,and the cavitation in the water.The cavitation chart of the projectile at the same time is given,and the related factors are discussed.The curves of load,peak surface pressure,pressure difference on both sides and velocity over time are given.The attitude flattening of the projectile after entering water was studied from the four aspects: projectile cavitation area,water entering angle,cavitation angle and water entering angle of attack.The attitude,velocity and displacement deflection angle of the projectile after entering the water,and the force of the projectile are discussed,and the method of changing the area of the cavitator is given.Based on the joint simulation of STAR-CCM and ABAQUS,twoway coupling calculation of vertical and oblique water entry was carried out for the projectile with structure.The dynamic characteristics of the projectile,the surface deformation of the projectile,and the stress and strain of the projectile were analyzed during the process of entering the water.