Preliminary Study of Coupling Electromagnetic Energy to Primasheet-1000 Explosive

Report No. ARL-TR-6446
Authors: Thuvan Piehler; Charles Hummer; Richard Benjamin; Kevin McNesby; Eugene Summer; Vincent Boyle
Date/Pages: May 2013; 32 pages
Abstract: It is anticipated that the introduction of high currents will increase the energy content of the combustion gases in the vicinity of the detonation front through ohmic heating. This increased energy should then lead to an increase in the detonation velocity. The approach is to transfer the stored electrical energy from a 160-kJ (5.5-kV) capacitor bank into the conductive zone behind the detonation front of an explosive reaction. The power supply employs a 6.5-kV, 0.010-F, 200-kJ capacitor bank. The explosive portion of the experimental apparatus consists of two copper plates (2.54 cm wide × 50 cm long × 1.27 cm thick) separated by a 0.1-, 0.2-, or 0.3-cm layer of Primasheet-1000 explosive. Upon initiation of the Primasheet-1000 explosive, an explosive switch allows the energy stored in the pulsed power assembly to be transferred through the copper plates and into the conducting reaction zone of the detonation front. Advanced diagnostics are used to image the advancing detonation front and to measure detonation velocity. Initial results show that there was an increase of ~4.2% in the detonation velocity observed in 0.1-cm-thick layers and ~2.6% enhancement in 0.2-cm-thick layers of Primasheet-1000 while inputting the electric energy into the reaction zone. No detonation velocity enhancement was observed in 0.3-cm-thick layers of Primasheet-1000 explosive.
Distribution: Approved for public release
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Last Update / Reviewed: May 1, 2013