Electro-Thermal Igniter (ETI) Particle Deposition Upon a Simulated Propellant Surface
Technical Report,01 Oct 2005,01 Dec 2007
ARMY RESEARCH LAB ABERDEEN PROVING GROUND United States
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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 plasma-propellant 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.