Research On The Characteristics Of Water Entry Ballistic Steering

High-speed trans-media water entry is a complex multi-media dynamics process that has always been the focus of major countries in the world.The high-speed cross-media water entry of projectiles can effectively combat the weak underwater targets of marine targets,and it is a hot topic of research.With the problems around China’s waters and the maritime disputes in various countries in the world in recent years,countries around the world have paid more and more attention to maritime operations.However,despite the increasing maritime interception methods in various countries around the world,underwater interception methods are extremely limited.Therefore,it is very meaningful to study the projectile’s high-speed trans-media water entering and changing direction,which further strengthens the protection effectiveness of China’s underwater defense weapons and the attack effectiveness of offensive weapons.This article studies various impact problems in the process of the projectile’s high-speed trans-media water entering and changing direction.First,based on the high-speed projectiles entering water theory,various mechanical phenomena such as flutter phenomena are researched and compared.Simulation software such as AUTODYN and FLUENT established the calculation method for the coupling of Euler and Lagrangian,and carried out reasonable simulation modeling and meshing.Developed high-speed inflow hydrodynamic analysis technology to achieve high speed of elastoplastic projectiles.The numerical simulation of the projectile’s high-speed trans-media water entering and changing direction provides a technical reference for engineering design analysis in related fields.Immediately afterwards,the study on the material model of the projectile’s high-speed trans-media water entering and changing direction was carried out.By comparing the experiments of Professor Guo Zitao of Harbin Institute of Technology,the correctness of the numerical simulation is verified,and the constitutive equations and parameters of the water-entry material are established,which lays the foundation for the true research on the projectile’s high-speed trans-media water entering and changing direction mechanism.On this basis,a series of "beveled angle" projectiles were launched to simulate of e projectile’s high-speed trans-media water entering and changing direction,and the stress of the projectile was analyzed during the water-turning process.By analyzing and summarizing the water-turning law of elastoplastic materials,the optimal high-speed water-turning conditions of the series of conditions proposed in this paper are obtained.The analysis of the projectile’s turning mechanism into water reveals parameters such as the bevel cutting angle of the projectile,the velocity of the projectile entering the water,and the angle of the projectile entering the water.It has an important theoretical significance and practical value for the influence of the elastoplastic projectile on the high-speed water-entry motion of the medium.This paper has deepened the understanding of the motion process and the flutter phenomenon of the projectile’s high-speed trans-media water entering and changing direction,and provided theoretical guidance for the design and optimization of the projectile’s trans-media water entering and changing direction.