空爆冲击波对高速破片绕流效应的仿真
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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.
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.
引文
[1]李伟,朱锡,梅志远,等.战斗部舱内爆炸对舱室结构毁伤的实验研究[J].舰船科学技术,2009,31(3):34-37.
[2]孔祥韶,吴卫国,李晓彬,等.圆柱形战斗部破片速度及等效装药特性研究[J].振动与冲击,2013a,32(9):146-149.
[3]HUTCHINSON M D.The escape of blast from fragmenting munition casing[J].Int J Impact Eng,2009,36(2):185-192.
[4]杨亚东,李向东,伯雪飞.起爆方式对可变形定向战斗部威力的影响[J].南京理工大学学报,2012,36(5):762-766,772.
[5]孔祥韶,吴卫国,杜志鹏,等.起爆点位置对战斗部爆炸破片特性的影响[J].哈尔滨工程大学学报,2013b,34(7):855-861.
[6]梅志远,沈全华,朱锡,等.中小型水面舰船抗毁伤结构设计初探[J].中国舰船研究,2007,2(6):68-72.
[7]侯海量,朱锡,梅志远.舱内爆炸载荷及舱室板架结构的失效模式分析[J].爆炸与冲击,2007,27(2):151.
[8]GONG Chao-an,CHEN Zhi-gang,YIN Li-kui.Analysis of movement laws of fragment and shock wave from a blast fragmentation warhead[J].Journal of Measurement Science and Instrumentation,2015,6(3):218-222.
[9]KONG X S,WU W G,LI J,et al.Experimental and numerical investigation on a multi-layer protective structure under the synergistic effect of blast and fragment loadings[J].Int JImpact Eng,2014,65(3):146-162.
[10]吕晓聪,许金奈,白二雷,等.弹片与爆炸冲击波耦合作用分析[J].解放军理工大学学报,2007,8(6):640-644.
[11]李茂,侯海量,朱锡,等.冲击波和高速破片对固支方板的联合作用数值模拟研究[J].中国舰船研究,2015,10(6):60-67.
[12]穆朝民,王仲琦,赵衡阳,等.爆炸冲击波作用于墙体及对墙体绕射的实验研究[J].实验力学,2008,23(2):169-174.
[13]郝莉,马天宝,王成,等.爆炸冲击波绕流的三维数值模拟研究[J].力学学报,2010,42(6):1042-1049.
[14]赵蓓蕾,崔村燕,陈景鹏,等.网格密度对基于LS-DYNA的冲击波数值模拟影响[J].自动化与仪器仪表,2015(9):227-231.
[15]Livermore Software Technology Corporation.LS-DYNAKeyword User’s Manual[M].California:Livermore Software Technology Corporation,2003.
[16]胡昌明,贺红亮,胡时胜.45号钢的动态力学性能研究[J].爆炸与冲击,2003,23(2):188-192.
[17]陈长海,朱锡,侯海量,等.近距空爆载荷作用下固支方板的变形及破坏模式[J].爆炸与冲击,2012,32(4):368-375.
[18]张成亮,朱锡,侯海量,等.近距空爆下复合抗爆舱壁变形破坏模式试验研究[J].振动与冲击,2014,33(11):33-37.
[19]孙业斌.爆炸作用与装药设计[M].北京:国防工业出版社,1987.
[2]孔祥韶,吴卫国,李晓彬,等.圆柱形战斗部破片速度及等效装药特性研究[J].振动与冲击,2013a,32(9):146-149.
[3]HUTCHINSON M D.The escape of blast from fragmenting munition casing[J].Int J Impact Eng,2009,36(2):185-192.
[4]杨亚东,李向东,伯雪飞.起爆方式对可变形定向战斗部威力的影响[J].南京理工大学学报,2012,36(5):762-766,772.
[5]孔祥韶,吴卫国,杜志鹏,等.起爆点位置对战斗部爆炸破片特性的影响[J].哈尔滨工程大学学报,2013b,34(7):855-861.
[6]梅志远,沈全华,朱锡,等.中小型水面舰船抗毁伤结构设计初探[J].中国舰船研究,2007,2(6):68-72.
[7]侯海量,朱锡,梅志远.舱内爆炸载荷及舱室板架结构的失效模式分析[J].爆炸与冲击,2007,27(2):151.
[8]GONG Chao-an,CHEN Zhi-gang,YIN Li-kui.Analysis of movement laws of fragment and shock wave from a blast fragmentation warhead[J].Journal of Measurement Science and Instrumentation,2015,6(3):218-222.
[9]KONG X S,WU W G,LI J,et al.Experimental and numerical investigation on a multi-layer protective structure under the synergistic effect of blast and fragment loadings[J].Int JImpact Eng,2014,65(3):146-162.
[10]吕晓聪,许金奈,白二雷,等.弹片与爆炸冲击波耦合作用分析[J].解放军理工大学学报,2007,8(6):640-644.
[11]李茂,侯海量,朱锡,等.冲击波和高速破片对固支方板的联合作用数值模拟研究[J].中国舰船研究,2015,10(6):60-67.
[12]穆朝民,王仲琦,赵衡阳,等.爆炸冲击波作用于墙体及对墙体绕射的实验研究[J].实验力学,2008,23(2):169-174.
[13]郝莉,马天宝,王成,等.爆炸冲击波绕流的三维数值模拟研究[J].力学学报,2010,42(6):1042-1049.
[14]赵蓓蕾,崔村燕,陈景鹏,等.网格密度对基于LS-DYNA的冲击波数值模拟影响[J].自动化与仪器仪表,2015(9):227-231.
[15]Livermore Software Technology Corporation.LS-DYNAKeyword User’s Manual[M].California:Livermore Software Technology Corporation,2003.
[16]胡昌明,贺红亮,胡时胜.45号钢的动态力学性能研究[J].爆炸与冲击,2003,23(2):188-192.
[17]陈长海,朱锡,侯海量,等.近距空爆载荷作用下固支方板的变形及破坏模式[J].爆炸与冲击,2012,32(4):368-375.
[18]张成亮,朱锡,侯海量,等.近距空爆下复合抗爆舱壁变形破坏模式试验研究[J].振动与冲击,2014,33(11):33-37.
[19]孙业斌.爆炸作用与装药设计[M].北京:国防工业出版社,1987.