空爆冲击波对不同形状破片的绕流作用仿真分析
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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,结合模型分析了冲击波对不同形状的高速破片绕流作用特点,对比讨论了破片形状因素对绕流冲击波的波形、强度等载荷特性的影响规律。结果表明:破片形状会影响绕流冲击波前端的波形和作用在结构上的载荷形式,对绕流冲击波的比冲量影响不大。当质量和厚度相同时,冲击波对三角形破片的扰流能力强于圆形和正方形破片;对于方形破片,破片越瘦长,冲击波对其绕流能力越强;当破片尺寸较小时,破片形状对绕流冲击波影响不明显。
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 factor of fragment shape was discussed by analyzing realistic cases and comparing Numerical Simulation cases. The results show that the shape of fragment can change the front end waveform of the turbulent flow and the load form of the blast wave that impact on the structure. However, it has little influence on specific impluse of blast wave. Keep mass and thickness of the fragments still, it will be easier for blast wave to weave throngh a triangular fragment than a circular or foursquare one. For the quadrate fragment, turbulent flow of the blast wave will be stronger when the quadrate fragment is lathier. When the size of the fragments are small, changing the shape of the fragment will change the turbulent flow of the blast wave little.
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 factor of fragment shape was discussed by analyzing realistic cases and comparing Numerical Simulation cases. The results show that the shape of fragment can change the front end waveform of the turbulent flow and the load form of the blast wave that impact on the structure. However, it has little influence on specific impluse of blast wave. Keep mass and thickness of the fragments still, it will be easier for blast wave to weave throngh a triangular fragment than a circular or foursquare one. For the quadrate fragment, turbulent flow of the blast wave will be stronger when the quadrate fragment is lathier. When the size of the fragments are small, changing the shape of the fragment will change the turbulent flow of the blast wave little.
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,2013,32(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):151-158.
[8]GONG Chao-an,CHEN Zhi-gang,YIN Li-kui.Analysis of movement laws of fragment and shock wave from a blast fragmentation warhead[R].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 TECHNOLOG YCORPORATION.LS-DYNA keyword 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,2013,32(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):151-158.
[8]GONG Chao-an,CHEN Zhi-gang,YIN Li-kui.Analysis of movement laws of fragment and shock wave from a blast fragmentation warhead[R].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 TECHNOLOG YCORPORATION.LS-DYNA keyword 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.