空爆冲击波对高速破片绕流效应的仿真  

Research on turbulent flow of blast wave on high-velocity fragments by numerical simulation

作　　者：郑红伟 陈长海[1] 李茂[1] 朱锡[1] 侯海量[1] ZHENG Hong-wei;CHEN Chang-hai;LI Mao;ZHU Xi;HOU Hai-liang(Department of Naval Architecture Engineering,Naval University of Engineering,Wuhan 430033,China)

机构地区：[1]海军工程大学舰船工程系,湖北武汉430033

出　　处：《舰船科学技术》2019年第1期33-38,共6页Ship Science and Technology

基　　金：国家安全重大基础研究资助项目(6133050203);国家自然科学基金资助项目(51409253;51679246)

摘　　要：为探讨空爆冲击波对高速破片的绕流效应及影响因素,采用Ansys/LS-DYNA软件建立了端部贴有预制破片的柱状TNT空爆仿真模型,结合实例分析冲击波对高速破片绕流作用特点,对比讨论破片间隙,破片尺寸和破片质量等因素对冲击波绕流的影响规律。结果表明:爆炸初期冲击波速度高于破片速度,在对破片加速的过程中,冲击波对高速破片存在绕流作用;破片间隙越大,单个破片尺寸越小,单个破片质量越大冲击波越容易对破片发生绕流;而在一定范围内破片之间间隙越小,破片尺寸越大,绕流过破片形成的冲击波强度越弱。所以爆炸初期在破片之前传播的冲击波为扰流过破片碰撞形成的冲击波,可为战斗部爆炸载荷传播特性和毁伤特性研究提供参考。Study is carried on turbulent flow of blast wave on high-velocity fragments and factors which may affect it.By Ansys/LS-DYNA software, simulation model of air blast that prefabricated fragments are affixed to the end of the columnar TNT is built. This research pays attention to describe the characteristic of the turbulent flow process and the influence factors such as fragment clearance, fragment size, fragment mass were discussed by analyzing realistic cases and comparing Numerical Simulation cases. The results show that turbulent flow of blast wave on high-velocity fragments take place at the beginning of the blast because the velocity of air-blast wave is higher than the velocity of fragments. What′s more, it will be easier for blast wave to make a detour, when the fragment is smaller, heavier and the clearance is bigger. Meanwhile, the smaller fragment clearance and bigger fragment size will make the detoured blast wave become weaker. In a word, the blast wave spread ahead of the fragments is turbulent flow of blast wave on high-velocity fragments. This research can provide reference for the study of blast loads propagation characteristic and damage characteristic.

关 键 词：爆炸力学 空爆冲击波 高速破片 绕流效应 数值仿真 

分 类 号：U661[交通运输工程—船舶及航道工程]