高电压技术2017，Vol.43Issue(9)：3042-3049,8.DOI:10.13336/j.1003-6520.hve.20170831036
外磁场对金属射流的作用机理
Action Mechanism of Imposed Magnetic Field on Shaped Charge Jet
摘要
Abstract
To analyze the action mechanism of imposed magnetic field on shaped charge jet,we established theoretical models of magnetic flux intensity distribution,inducted current density distribution and electromagnetic force distribution of shaped charge jet under the action of pulse current of coil according to Maxwell equations.Moreover,a finite element model of excitation coil and shaped charge jet was built,and action rule of magnetic field produced by excitation coil along axis direction on shaped charge jet was researched.Finally,with simulation test of low melting point alloy instead of shaped charge jet,theoretical analysis and analogue simulation were verified.The results show that induced current of shaped charge jet is opposite to pulse current of excitation coil,the electromagnetic force action on shaped charge jet will point to the center from the surface along radial direction.As a result of skin effect action,magnetic flux intensity,induced current density and electromagnetic force all point to the center from the surface of shaped charge jet,of which the bulge region is bigger than that of depressed region.When electromagnetic force is large enough,the diameter distance of necking parts can be shrunk,fracture trend of shaped charge jet will be delayed,and penetration of shaped charge jet will be increased in the end.Research results can produce a significant effect on improving penetration of shaped charge jet to target.关键词
轴向脉冲磁场/金属射流/感应电流密度/磁感应强度/电磁力Key words
axial pulse magnetic field/shaped charge jet/inducted current density/magnetic flux intensity/electromagnetic force引用本文复制引用
孟学平,雷彬,向红军,齐文达,黄旭..外磁场对金属射流的作用机理[J].高电压技术,2017,43(9):3042-3049,8.基金项目
国家自然科学基金(51307182).Project supported by National Natural Science Foundation of China(51307182). （51307182）
