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Interaction between solid copper jets and powerful electrical current pulses
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
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2011 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 78, no 2Article in journal (Refereed) Published
Abstract [en]

The interaction between a solid copper jet and an electric current pulse is studied. Copper jets that were created by a shaped-charge device were passed through an electrode configuration consisting of two aluminum plates with a separation distance of 150 mm. The electrodes were connected to a pulsed-power supply delivering a current pulse with amplitudes up to 250 kA. The current and voltages were measured, providing data on energy deposition in the jet and electrode contact region, and flash X-ray diagnostics were used to depict the jet during and after electrification. The shape of, and the velocity distributions along, the jet has been used to estimate the correlation between the jet mass flow through the electrodes and the electrical energy deposition. On average, 2.8 kJ/g was deposited in the jet and electrode region, which is sufficient to bring the jet up to the boiling point. A model based on the assumption of a homogenous current flow through the jet between the electrodes underestimates the energy deposition and the jet resistance by a factor 5 compared with the experiments, indicating a more complex current flow through the jet. The experimental results indicate the following mechanism for the enhancement of jet breakup. When electrified, the natural-formed necks in the jet are subjected to a higher current density compared with other parts of the jet. The higher current density results in a stronger heating and a stronger magnetic pinch force. Eventually, the jet material in the neck is evaporated and explodes electrically, resulting in a radial ejection of vaporized jet material.

Place, publisher, year, edition, pages
2011. Vol. 78, no 2
Keyword [en]
Aluminum plates, Current flows, Current pulse, Electric current pulse, Electrical current pulse, Electrical energy, Electrode configurations, Electrode contacts, Energy depositions, Flash X-rays, Jet breakup, Mass flow, Model-based, Pulsed-power supplies, Separation distances, Copper, Electric utilities, Electrodes, Electric power systems
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-33194DOI: 10.1115/1.4002568ISI: 000298381300006ScopusID: 2-s2.0-78549264231OAI: diva2:413899
QC 20120130Available from: 2011-04-29 Created: 2011-04-29 Last updated: 2012-01-30Bibliographically approved
In thesis
1. Gigawatt pulsed power technologies and applications
Open this publication in new window or tab >>Gigawatt pulsed power technologies and applications
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. x, 85 p.
Trita-EE, ISSN 1653-5146 ; 2011:034
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:kth:diva-33034 (URN)978-91-7415-962-2 (ISBN)
Public defence
2011-05-20, sal F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
QC 20110502Available from: 2011-05-02 Created: 2011-04-27 Last updated: 2011-05-02Bibliographically approved

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