Study on Physical Characteristics and Shock Wave Behavior of Aluminum Powder Suspension Ignited by Electrical Wire Explosion

doi:10.12382/bgxb.2023.0244

Abstract

Abstract:

Underwater electrical wire explosion driven by a high-power electric pulse is accompanied by physical effects such as shock wave, plasma and strong light radiation. Therefore, it has achieved remarkable results in the underwater explosion simulation and the exploition of unconventional oil and gas. Due to the skin effect and the limited electrical insulation of the equipment, it is often impossible to obtain the required shock wave by increasing the stored energy and load quality without limitation. In this paper, the underwater electrical explosion of copper wire is used to ignite the aluminum powder suspensions with particle sizes of 10μm and 1μm to find the mechanism of detonation of aluminum powder suspension to enhance shock wave. The details of space-time evolution of aluminum powder suspension ignited by the electrical explosion are obtained through the diagnosis of electrical physical parameters and high-speed backlight images. The discharge characteristics and ignition mechanism of aluminum powder suspension under electric-hydraulic breakdown and electrical explosion are studied, and the relationship between the stored energy and shock wave is established. It is found that the ignition of aluminum powder suspension by electrical wire explosion is a result of the joint action of near-field shock wave, plasma and strong light radiation, and then the continuously combusting aluminum powder injects energy into the surrounding compressed water layer, which enhances the amplitude, positive action time and impulse of shock wave.

Key words: electrical explosion, plasma, shock wave, aluminum powder suspension, pulsed power technology

CLC Number:

TM89

HAN Ruoyu, YUAN Wei, LI Chen, CAO Yuchen, BAI Jie. Study on Physical Characteristics and Shock Wave Behavior of Aluminum Powder Suspension Ignited by Electrical Wire Explosion[J]. Acta Armamentarii, 2023, 44(12): 3743-3754.

Figures/Tables 11

Fig.1 Experimental device

Fig.2 Schematic diagram of experimental load

Fig.3 Representative electrical waveforms of electric breakdown Al powder suspension (particle size of 10μm)

Fig.4 Typical high-speed backlight images of electric breakdown Al powder suspension (particle size of 10μm)

Fig.5 Discharge characteristics of aluminum powder suspension driven by electrical wire explosion

Table 1 Statistics of discharge parameters

介质	电压峰值/kV	首次电流峰值/kA	二次电流峰值/kA	电阻峰值/Ω	功率峰值/MW	总沉积能量/J
纯水	25.9	11.5	11.2	2.7	255	259
10μm铝粉悬浮液	20.1	11.3	8.8	2.1	203	292
1μm铝粉悬浮液	25.4	11.2	11.3	2.8	239	271

Fig.6 Electrical parameters and high-speed backlight images of Al powder suspension (particle size of 10μm) driven by electrical wire explosion (diameter of 50μm)

Fig.7 Typical high-speed backlight images of Al powder suspension (particle size of 10μm) driven by electrical wire explosion (diameter of 200μm)

Fig.8 Typical high-speed backlight images of Al powder suspension (particle size of 1μm) driven by electrical wire explosion (diameter of 200μm)

Fig.9 Pressure and impulse waveforms at different stored energy levels

Table 2 Statistics of shock wave parameters

有无铝粉	储能/J	峰值/MPa	冲量/(Pa·s)	能量/J
无	500	2.54	11.58	15.84
有	150	2.29	8.27	9.92
有	250	3.65	13.30	31.51
有	500	4.84	24.56	59.12
有	750	5.35	31.49	92.28

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