超空泡射弹尾部冲击载荷的仿真研究

Simulation analysis of impact loads on tails of supercavitating projectiles

摘要:

为了研究超空泡射弹尾拍冲击载荷的特性,利用Logvinovich G.V.的独立膨胀原理对流体域提出了一种简化处理模型,并采用流固耦合的方法,对初始扰动角速度、射弹质量、质心位置和刚度对尾拍力的影响进行了仿真计算.结果表明:初始角速度和弹体质量的增加都会使尾拍力增大,而弹体弹性模量的增加会使尾拍力变小;碰撞次数随初始角速度的增加而增多,随弹体质量的增加和质心的后移而减少;一次撞击的作用时间随着弹体质量的增加和质心的后移而变大.减小初始角速度,采用密度较小、刚度较大的材料可以降低尾拍冲击的强度,从而减小其对射弹结构和运动稳定性可能产生的破坏作用.

Abstract:

To study the characteristics of impact loads on the tails of supercavitating projectiles undergoing tail-slaps,a simple model for fluid region based on the Logvinovich’s Principle was presented,and the FSI method was employed.The effects of initial disturbance angular velocity,mass of projectiles,position of centroid and rigidity of projectiles on the impact loads of tail-slaps were investigated by simulations.The results showed that the greater the projectile’s mass and initial angular velocity and the smaller the elastic modulus,the greater the impact loads.The impact times increase with the increasing of initial angular velocity,however the impact times decrease,while the impact durations increase,with the mass increase and the center of mass moving back.As result,tail-slap forces which could destroy the structure and the moving stability of the projectiles can be lessened by smaller initial angular velocity,lower density,and larger elastic modulus of the bodies.