dc.contributor.author	Gallimore, Scott Douglas	en
dc.contributor.committeemember	Mahan, James Robert	en
dc.contributor.committeemember	Vandsburger, Uri	en
dc.contributor.committeemember	Schetz, Joseph A.	en
dc.contributor.committeemember	Maurice, Lourdes Q.	en
dc.contributor.department	Mechanical Engineering	en
dc.date.accessioned	2014-03-14T20:10:02Z	en
dc.date.adate	2001-04-20	en
dc.date.available	2014-03-14T20:10:02Z	en
dc.date.issued	2001-04-13	en
dc.date.rdate	2002-04-20	en
dc.date.sdate	2001-04-19	en
dc.description.abstract	The main goal of this project was to investigate the mixing and chemical phenomena associated with the integration of a low-power, uncooled plasma torch into a fuel injector array. The potential application was for an integrated scramjet igniter/injector, with the hope of producing superior mixing and flameholding performance for supersonic combustion applications. To create a knowledge base for integration, several key investigations were made of the anode material, anode geometry, and spectrographic analysis of different light hydrocarbon fuels and inert feedstocks, all aimed at increasing the ignition potential of the plasma torch. Investigations of the anode material demonstrated the molybdenum provided longer lifetimes than either pure copper or tungsten-copper anodes. In addition, geometric studies of the anode revealed that anodes with short constrictor lengths and sonic exit nozzles provided superior ignition performance based on higher transfer rates of thermal energy from the arc to the feedstock. This resulted in the production of higher hydrogen atom concentrations within the plasma jet. Spectrographic observation of the plasma jets revealed that methane, ethylene, propylene, and propane plasmas all contain excited atomic hydrogen, a radical known to participate in important chain-branching combustion reactions. Based on the knowledge gained, and encouraging results, a candidate scramjet igniter and flameholder was designed. The design was observed to exhibit a synergistic effect between the plasma igniter and fuel injector in that the fuel injector provides not only a subsonic region for plasma ignition, but also lifts the combustion enhancing radicals out into the fuel-air stream by means of counter-rotating vortices. Furthermore, under the conditions tested, increases in plasma torch power produced an exponential increase in the intensity of downstream products, indicating an enhancement effect. Based upon these observations, the integrated igniter/injector design is expected to perform well in supersonic combustion applications.	en
dc.description.degree	Ph. D.	en
dc.identifier.other	etd-04192001-184610	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-04192001-184610/	en
dc.identifier.uri	http://hdl.handle.net/10919/26988	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	Chapter_1_Lit_Review.pdf	en
dc.relation.haspart	Chapter_2_Torch.pdf	en
dc.relation.haspart	Refs_and_Apps.pdf	en
dc.relation.haspart	Chapter_9_Integrated.pdf	en
dc.relation.haspart	Chapter_8_CFD.pdf	en
dc.relation.haspart	Chapter_3_Setup.pdf	en
dc.relation.haspart	Chapter_10_Conclusions.pdf	en
dc.relation.haspart	Introduction.pdf	en
dc.relation.haspart	Chapter_5_Spectro.pdf	en
dc.relation.haspart	Chapter_6_Geometry.pdf	en
dc.relation.haspart	Chapter_4_Erosion.pdf	en
dc.relation.haspart	Chapter_7_Torch_op.pdf	en
dc.relation.haspart	Cover_Abstract_TOC.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.title	A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications	en
dc.type	Dissertation	en
thesis.degree.discipline	Mechanical Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	doctoral	en
thesis.degree.name	Ph. D.	en

A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications

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