摘要
为提高装甲防护性能,对被动电磁装甲中金属射流所受箍缩电磁力作用进行了研究。在等效电路模型基础上,给出了与箍缩电磁体积力等效的表面电磁压强理论公式,分析了等效表面电磁压强随时间振荡衰减变化的规律;通过分析平均等效表面电磁压强的临界现象,认为金属射流半径与趋肤深度的比值r槇<1时,平均等效表面电磁压强会随相对半径的减小而急剧增大。数值模拟和理论分析结果都显示:在合适参数下,平均等效表面电磁压强会在金属射流较细部位急剧增加,从而导致腊肠不稳定性。5kV被动电磁装甲试验结果显示:金属射流受箍缩电磁力影响后,在后效靶板上的穿孔直径明显比不加电情况大。上述研究进一步完善了被动电磁装甲对破甲弹的防护机理,对被动电磁装甲的应用具有一定的指导意义。
To improve the defense ability of the armor,we studied pinch electromagnetic force which was suffered from shaped charge jet penetrated in passive electromagnetic armor.Based on the equivalent circuit model,the theoretical formula of surface electromagnetic pressure which was equivalent to the electromagnetic volume force was given,and the rule that the equivalent surface electromagnetic pressure concussively decays with time was analyzed.By analyzing the critical phenomenon of average equivalent surface electromagnetic pressure,the influence of the ratio of the shaped charge jet radius to skin depth r on the threshold of the critical phenomenon was studied,and it was found that when r1,the average equivalent surface electromagnetic pressure increases rapidly as the diameter r decreases.Numerical simulation and theoretical analysis results show that,after appropriately selecting the parameter conditions,the average equivalent surface electromagnetic pressure will rapidly increase in the smaller parts of the shaped charge jet,which leads to the sausage instability.Results of a 5 kV passive electromagnetic armor test indicate that,influenced by pinch electromagnetic force,the perforation diameter of the shaped charge jet in the aftereffect target plate is obvious larger than that without current.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2013年第1期251-256,共6页
High Voltage Engineering
关键词
被动电磁装甲
破甲弹
金属射流
电磁箍缩力
表面电磁压强
腊肠不稳定性
passive electromagnetic armor
high explosive anti-tank projectile
shaped charge jet
pinch electromagnetic force
surface electromagnetic pressure
sausage instability
