基于流固耦合的入水特性仿真与试验研究

Simulation and Test Research of Water Entry Law based on Fluid Solid Coupling

针对跨介质飞行器入水冲击过程中流固耦合问题,研究不同速度对飞行器载荷和姿态的影响,基于LS-DYNA软件,采用任意拉格朗日-欧拉算法对速度在40~120 m/s的飞行器入水模型进行数值模拟,获取模型入水过程中的冲击过载和姿态变化,并通过试验验证。结果表明,冲击过载峰值随着速度增大而增大,且脉冲宽度越窄;角速度和俯仰角的变化斜率呈现先增大再减小的趋势。研究结果可为飞行器入水特性的理论和试验研究以及工程化应用提供参考。

Aiming at the fluid-structure coupling problem in the process of trans-media vehicle,the effects of different velocities on loads and status of trans-media vehicle are studied.Based on LS-DYNA software,the multi-medium Arabic Lagrange Euler(ALE)method is used to simulate the water entry model of a projectile with velocity of 40-120 m/s,and the impact load and status are obtained,the results are carried out by experiment.The results show that the peak value of impact load increases with the increase of water entry velocity,and the width pulse is more narrow.The slope of angular velocity and pitch angle increase first and then reduces.The research provides reference for the basic theory and engineering application of water entry law.