Interaction between solid copper jets and powerful electric current pulses
2011 (English)In: Journal of applied mechanics, ISSN 0021-8936, E-ISSN 1528-9036, Vol. 78, no 2, 021006- p.Article in journal (Refereed) Published
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 five compared to the experiments, indicating a more complex current flow through the jet. The experimental results indicate the following mechanism for the enhancement of jet break-up. When electrified, the natural-formed necks in the jet are subjected to a higher current density compared to 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, 021006- p.
Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-197561DOI: 10.1115/1.4002568OAI: oai:DiVA.org:uu-197561DiVA: diva2:613414