RESEARCH ON ELECTROMAGNETIC RADIATION DURING THE EXPLOSION PROGRESS OF COMPOSITION B EXPLOSIVES$^{\bf 1)}$

doi:10.6052/0459-1879-20-010

Abstract

Abstract:

The electromagnetic radiation interference, which can be obviously observed during the explosives process, has attracted attention in many fields. However, the corresponding generation mechanism and theoretical model are still immature, experiments are still the key approach to study this phenomenon. This paper designs experiments to collect the electromagnetic radiation signals, generated by different charges of composition B explosives (Comp B), and uses the wavelet transform method to obtain these signals time-frequency characteristics, namely the main spectrum distribution is in the range of 0$\sim$50 kHz. Furthermore, the self-developed EXPOSION-3D software is used to simulate the experimental conditions to obtain the characteristics of the flow field during the explosion. By comparing the experimental results with the numerical simulations, series of conclusions are given in the following. The first pulse signal is the electromagnetic pulse directly generated by the high-temperature and high-pressure plasma generated by the detonation of Comp B; the second pulse signal is an electromagnetic pulse generated by the plasma formed at the air shock wave front which is caught up by the reflected shock wave from the ground; the third pulse signal is an invalid signal caused by the shock wave hitting the measurement coils. The amplitude of the first electromagnetic pulse has a linear relationship with the 1/3 power of the charge, and its arrival time is not sensitive to the charge of explosive. The time of the second electromagnetic pulse is in an exponential relationship with the charge of explosive. Overall, this paper put forward the characteristics of the explosion wave flow field when the shock wave reflection forms the electromagnetic wave signal, which provides verification data for the subsequent theoretical research.

Key words: detonation, electromagnetic pulse, wavelet analysis, numerical simulation

CLC Number:

TJ410.1

Ren Huilan, Chu Zhuxin, Li Jianqiao, Ma Tianbao. RESEARCH ON ELECTROMAGNETIC RADIATION DURING THE EXPLOSION PROGRESS OF COMPOSITION B EXPLOSIVES$^{\bf 1)}$[J]. Chinese Journal of Theoretical and Applied Mechanics, 2020, 52(4): 1199-1210.

Figures/Tables 15

Fig. 1 Diagram showing the experimental set up

Fig. 2 Electromagnetic signals in experiments

Fig. 3 Comparison between the original and de-noised waveforms of CH1 in case 2

Fig. 4 Comparison between the original and de-noised waveforms of CH1 in case 2

Fig. 5 Frequency spectrum of CH1 in case 2

Fig. 6 Low frequency spectrum of CH1 in case 2

Fig. 7 The arriving time of each typical pulse in all three cases

Fig. 8 Relationship between the arriving time of the second pulse and the explosion equivalent

Table 1 The amplitude of each typical pulse

Fig. 9 Relationship between the amplitude of the first pulse and the explosion equivalent

Fig. 10 Numerical model of the experimental case

Fig. 11 Numerical simulation results of 6 kg composition B explosives at different time after detonation

Fig. 12 Two-dimensional slices of the pressure distribution in each case when the third pulse arrived

Fig. 13 Comparison between the arriving time of the third pulse in experiments and the calculated time when the shock wave reaches the measurement coils

Fig. 14 Two-dimensional slices of the pressure distribution in each case when the second pulse arrived

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