Title page for ETD etd-04192001-184610

Type of Document Dissertation
Author Gallimore, Scott Douglas
Author's Email Address sgallimo@vt.edu
URN etd-04192001-184610
Title A Study of Plasma Ignition Enhancement for Aeroramp Injectors in Supersonic Combustion Applications
Degree PhD
Department Mechanical Engineering
Advisory Committee
Advisor Name Title
Mahan, James Robert Committee Member
Maurice, Lourdes Q. Committee Member
Schetz, Joseph A. Committee Member
Vandsburger, Uri Committee Member
  • No Keywords Found
Date of Defense 2001-04-13
Availability unrestricted
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.

  Filename       Size       Approximate Download Time (Hours:Minutes:Seconds) 
 28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access 
  Chapter_10_Conclusions.pdf 21.71 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01
  Chapter_1_Lit_Review.pdf 168.22 Kb 00:00:46 00:00:24 00:00:21 00:00:10 < 00:00:01
  Chapter_2_Torch.pdf 58.51 Kb 00:00:16 00:00:08 00:00:07 00:00:03 < 00:00:01
  Chapter_3_Setup.pdf 95.73 Kb 00:00:26 00:00:13 00:00:11 00:00:05 < 00:00:01
  Chapter_4_Erosion.pdf 214.53 Kb 00:00:59 00:00:30 00:00:26 00:00:13 00:00:01
  Chapter_5_Spectro.pdf 300.01 Kb 00:01:23 00:00:42 00:00:37 00:00:18 00:00:01
  Chapter_6_Geometry.pdf 889.75 Kb 00:04:07 00:02:07 00:01:51 00:00:55 00:00:04
  Chapter_7_Torch_op.pdf 1.89 Mb 00:08:45 00:04:30 00:03:56 00:01:58 00:00:10
  Chapter_8_CFD.pdf 224.24 Kb 00:01:02 00:00:32 00:00:28 00:00:14 00:00:01
  Chapter_9_Integrated.pdf 600.60 Kb 00:02:46 00:01:25 00:01:15 00:00:37 00:00:03
  Cover_Abstract_TOC.pdf 43.86 Kb 00:00:12 00:00:06 00:00:05 00:00:02 < 00:00:01
  Introduction.pdf 21.67 Kb 00:00:06 00:00:03 00:00:02 00:00:01 < 00:00:01
  Refs_and_Apps.pdf 1.05 Mb 00:04:50 00:02:29 00:02:10 00:01:05 00:00:05

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