Discharge characteristics and spatial-temporal evolution of Cu-Ni alloy wire explosion

Han Ruoyu; Deng Chengzhi; Feng Juan; Li Chen; Yao Weibo; Ouyang Jiting

doi:10.11884/HPLPB202133.210103

Volume 33 Issue 6

Jun. 2021

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Han Ruoyu, Deng Chengzhi, Feng Juan, et al. Discharge characteristics and spatial-temporal evolution of Cu-Ni alloy wire explosion[J]. High Power Laser and Particle Beams, 2021, 33: 065010. doi: 10.11884/HPLPB202133.210103

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Han Ruoyu, Deng Chengzhi, Feng Juan, et al. Discharge characteristics and spatial-temporal evolution of Cu-Ni alloy wire explosion[J]. High Power Laser and Particle Beams, 2021, 33: 065010. doi: 10.11884/HPLPB202133.210103

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Discharge characteristics and spatial-temporal evolution of Cu-Ni alloy wire explosion

doi: 10.11884/HPLPB202133.210103

1.
Research Center for Electrostatics and Applications, School of Physics, Beijing Institute of Technology, Beijing 100081, China
2.
State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024, China

Received Date: 2021-03-22
Rev Recd Date: 2021-05-25

Available Online: 2021-06-11

Publish Date: 2021-06-15

Abstract

Abstract

Electrical explosion of wires (EEW) driven by pulse current can produce plasmas with high energy density, and is accompanied by electromagnetic pulses, strong shock waves, etc., therefore it is widely adopted in Z-pinch, electrothermal chemical weapons, oil and gas exploitation and other fields. Compared to pure metal, alloy has characteristics of the high resistivity, adjustable composition, and complex phase transitions. It has great potential in regulating parameters of EEW. This paper presents an experimental study on exploding Cu, Ni, and Cu-Ni alloy (constantan) wires in atmospheric air under a microsecond time-scale pulsed current. Through the diagnoses of electrical parameters and self-emission images, the discharge characteristics and spatial-temporal evolution of explosion products were obtained. Features of the alloy wire explosion in phase transition and plasma were acquired as well. Experiments revealed that in the early stage of EEW, the high resistivity of the alloy could improve the energy deposition efficiency, namely 52% for Cu, 74% for Ni, and 78% for Cu-Ni, while after the explosion, performance of the alloy wire was closer to that of the Ni wire. The initial expansion rate of the plasma channel reached 5 mm/μs level but then decayed. The expansion process of alloy wire endured longer, and the average resistivity went up slowly after the breakdown. Also, a correlation was found between plasma radiation and metal aerosol in spatial scale. Especially, the alloy aerosol has crossed striation features (10⁻¹ mm), but it is more uniform than Cu aerosol generally.
- electrical wire explosion,
- warm dense matter,
- optical emission,
- plasma diagnostics,
- binary alloy,
- nano-powder preparation

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References(18)

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