Electro-Thermal Igniter (ETI) Particle Deposition Upon a Simulated Propellant Surface

Report No. ARL-TR-4377
Authors: Stephen L. Howard
Date/Pages: February 2008; 25 pages
Abstract: An experimental investigation was performed to gain insights into the flows resulting from a plasma jet impinging on a flat plate at representative incident angles of 90, 60, and 45 degrees in the open air for two plasma pulse lengths (~0.3 and 1.0 ms) and two plasma energies (0.7 and 1.3 kJ). Specifically, the investigation characterized the influence of the pulse length, pulse energy, and angle on particle deposition on a flat simulated propellant surface in an attempt to clarify the effect of plasmapropellant interactions occurring during the electro-thermal ignition of a propellant charge system. Comparisons of data from the flow signature on impingement plates showed that although a plasma jet with a short pulse length may be more powerful, the shorter time duration of flow reduced the number of particles that were deposited. Therefore, the pulse length may be a key parameter needed to be optimized in order to effectively ignite a propellant charge system with a minimum demand of electrical energy. Differences in deposition at variable incident angles of jet impingement were also evident.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2008