Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 53, Issue 34, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6463/ab8b07
Keywords
electrical explosion of a wire; metal plasma; optical emission; shock wave; plasma ignition
Categories
Funding
- National Natural Science Foundation of China [51907007]
- China Postdoctoral Science Foundation [2019M650511]
- State Key Laboratory of Intense Pulsed Radiation Simulation and Effect [SKLIPR1906]
- Beijing Institute of Technology Research Fund Program for Young Scholars [3180012222007]
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This paper deals with an experimental study regarding the spatial-temporal evolution of single wire explosions in air and water at atmospheric pressure. Experiments were carried out with a microsecond timescale pulsed current source under 500 J stored energy. The morphology of the exploding wire with different discharge type, wire material, insulating coat, and ambient medium was intensively observed via self-emission images. The results revealed that the plasma radiation of wire explosion in air mainly contained two stages: initial intense radiation from optically thick plasma, and later decaying radiation from expanded arc-like plasma. A hollow structure was observed in a Cu exploding wire in air, and the plasma channel tended to develop inside it. As for W case, there would always be a core-corona structure, resulting in lower expansion rate and shock wave strength. Moreover, the plasma radiation of the underwater wire explosion was mainly determined by two factors: expansion rate and chemical reaction. The expansion rate of the radiant region in water was only 10(-1)mm mu s(-1)level (1 mm mu s(-1)level for air), leading to the lagging radiation. No noticeable difference in morphology was found between Cu and W wire explosions in water. Particularly, the Al wire explosion generated a bright light emission due to chemical reactions. Finally, radiative characteristics in an exploding wire were preliminarily concluded and existing problems proposed.
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