Basic Theory of Loading Liner With Electromagnetic Energy and Explosives

doi:10.12382/bgxb.2022.0120

Abstract

Abstract:

To improve the explosive’s energy utilization rate of the shaped charge jet, a principle structure in which electromagnetic energy and explosive are combined to load the liner is proposed considering the principles of the liner loaded by electromagnetic force and magnetic flux compression generator. Combined loading is divided into two stages: in the first stage, the capacitor discharge and the initial magnetic flux is formed in the magnetic flux compression generator; in the second stage, Explosive 1 detonates, which compresses the magnetic field and increases the current, and at the same time, the detonation wave propagates to the liner to detonate Explosive 2. The electromagnetic force and detonation pressure jointly crush the liner. Combined with the explosive detonation theory, traditional PER theory of jet formaton and electromagnetic loading characteristics, a theoretical model of jet formation of a liner under combined electromagnetic and explosive loading is established. Then, the jet formation of ϕ56mm shaped charge under the combined loading structure is calculated by the theoretical model, and the influence of the combined loading sequence on jet forming is analyzed by theoretical calculation. The computational results show that the combined electromagnetic and explosive loading can increase the velocity and kinetic energy of the shaped jet, improve the explosive utilization rate of the jet, and optimize the combined loading sequence, which will further improve the jet velocity and kinetic energy. The kinetic energy of the jet under combined loading is 34.5% higher than that of the traditional shaped charge, and the energy utilization rate of explosive is increased by 36%.

Key words: shaped jet, electromagnetic energy and explosives, energy utilization, magnetic flux compression generator, combined loading sequence

DOU Jianhao, JIA Xin, LIANG Zhengfeng, HUANG Zhengxiang, XUE Biao. Basic Theory of Loading Liner With Electromagnetic Energy and Explosives[J]. Acta Armamentarii, 2023, 44(6): 1754-1763.

Figures/Tables 21

Fig.1 Schematic diagram of traditional shaped charge

Fig.2 Schematic diagram of the combined loading principle of explosives and electromagnetic force

Fig.3 Schematic diagram of effective charge

Fig.4 Process of FCG

Fig.5 Flow chart of calculating the collapse velocity of the liner under combined loading

Fig.6 Velocity diagram in stationary point coordinate system

Fig.7 ϕ56mm shaped charge structure[21]

Fig.8 Charge structure under combined loading

Fig.9 Current and FCG inductance changes in the magnetic flux compression stage

Fig.10 Comparison of collapse velocities of different loading methods

Fig.11 Comparison of jet velocities of different loading methods

Fig.12 Time of elements collapsing to the axis

Table 1 Numerical examples

编号	r_c/mm	R₂₀/mΩ	L₂₀/μH	I₀/kA	t_u/μs	I_max/kA
s-1	50	2.2	4.1	66.5	14.3	1737
s-2	45	2.0	3.2	76.1	12.1	1585
s-3	40	1.8	2.2	91.5	9.8	1357

Fig.13 Current comparison of different examples

Fig.14 Comparison of collapse velocities of different examples

Fig.15 Comparison of collapse velocities of different elements

Fig.16 Comparison of jet velocities in different examples

Fig.17 Comparison of jet velocities of different elements

Fig.18 Comparison of collapse velocities

Fig.19 Comparison of jet velocities

Table 2 Kinetic energy and energy utilization rate of jet

算例	射流动能/kJ	炸药能量利用率/%
s-0	116	8.4
s-1	139	10.1
s-2	143	10.4
s-3	144	10.5
s-2-1	147	10.7
s-3-1	156	11.4

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