脉冲电流对金属射流箍缩电磁力的计算及验证

Calculation and Verification of Pinch Electromagnetic Action on the Shaped Charge Jet by Pulse Current

为深入研究被动电磁装甲的防护机理,进行了脉冲电流作用下金属射流受到的箍缩电磁力作用研究。通过频域分析方法得到了脉冲电流在金属射流中的电流密度分布,并结合反趋肤效应现象研究了射流受到的等效表面电磁压强随半径以及电流密度分布的变化规律。通过数值分析表明:脉冲放电的下降沿出现反趋肤效应时,金属射流受到的等效表面电磁压强大于相同电流时出现趋肤效应时的值。通过被动电磁装甲试验验证了脉冲电流产生的箍缩电磁力的作用效果。在注入脉冲电流的情况下,射流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 further research of the passive electromagnetic armor protection mechanism,pinch electromagnetic force suffers on shaped charge jet penetrated by pulse current was studied.Based on the frequency analysis method,the distribution of pulse current density in the shaped charge jet was calculated,and the characteristics of the equivalent surface electromagnetic pressure with jet radius and current density distribution were researched.Numerical simulation results show that,as the inverse skin effect occurs at the current trailing edge,the equivalent surface electromagnetic pressure is little than that at the rising edge for the same value of current.The influence of the pinch electromagnetic force on the shaped charge jet by pulse current is verified by apassive electromagnetic armor test.As injecting pulse current in the jet,the perforation diameter of the shaped charge jet in the aftereffect target plate is obvious large than that of no current.The above study perfects the protection mechanism of passive electromagnetic armor against shaped charge,and has a guiding significance of passive electromagnetic armor applications.