Generation of fast cumulative water jets by underwater electrical explosion of conical wire arrays

The results of experiments with underwater electrical explosion of conical arrays of copper wires are presented. A pulsed generator producing a 300 kA-amplitude current with a 1.2 μs rise time was used in the explosion of the arrays. As a result of the explosion, fast-moving water jets, with velocit...

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Bibliographic Details
Published in:Journal of applied physics 2015-01, Vol.117 (1)
Main Authors: Shafer, D., Gurovich, V. Tz, Yanuka, D., Zvulun, E., Gleizer, S., Toker, G., Krasik, Ya. E.
Format: Article
Language:English
Subjects:
Apex angle
Applied physics
Arrays
Ejection
Electric wire
Explosions
Hydraulic jets
Mathematical models
Position measurement
Thickness
Underwater
Velocity
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Summary:The results of experiments with underwater electrical explosion of conical arrays of copper wires are presented. A pulsed generator producing a 300 kA-amplitude current with a 1.2 μs rise time was used in the explosion of the arrays. As a result of the explosion, fast-moving water jets, with velocities of up to 1200 m/s, were observed being ejected from the surface of the water covering the wire array. The position of the water jets was measured by multiple-exposure fast framing imaging. The apex angle of the array or the thickness of the water layer above the arrays was altered from shot to shot, which changed the resulting velocities and shapes of the emitted jets. A numerical model, based on the models of cumulation and penetration of a jet through material of similar density, is suggested. The velocities of jets obtained by this model agree well with the experimentally observed jet velocities.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4905548