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.
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March 2011
Research Papers
Interaction Between Solid Copper Jets and Powerful Electrical Current Pulses
Torgny E. Carlsson,
Torgny E. Carlsson
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Andreas Helte,
Andreas Helte
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Tomas Hurtig,
Tomas Hurtig
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Anders Larsson,
Anders Larsson
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Patrik Lundberg,
Patrik Lundberg
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Melker Skoglund,
Melker Skoglund
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Lars Westerling
Lars Westerling
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
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Patrik Appelgren
Torgny E. Carlsson
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Andreas Helte
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Tomas Hurtig
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Anders Larsson
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Patrik Lundberg
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Melker Skoglund
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, Sweden
Lars Westerling
Swedish Defence Research Agency (FOI)
, SE-164 90 Stockholm, SwedenJ. Appl. Mech. Mar 2011, 78(2): 021006 (7 pages)
Published Online: November 8, 2010
Article history
Received:
September 9, 2009
Revised:
February 25, 2010
Posted:
September 16, 2010
Published:
November 8, 2010
Online:
November 8, 2010
Citation
Appelgren, P., Carlsson, T. E., Helte, A., Hurtig, T., Larsson, A., Lundberg, P., Skoglund, M., and Westerling, L. (November 8, 2010). "Interaction Between Solid Copper Jets and Powerful Electrical Current Pulses." ASME. J. Appl. Mech. March 2011; 78(2): 021006. https://doi.org/10.1115/1.4002568
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