Ignition characteristics of laser-ionized fuel injected into a hypersonic crossflow

Brieschenk, Stefan, O'Byrne, Sean and Kleine, Harald (2014) Ignition characteristics of laser-ionized fuel injected into a hypersonic crossflow. Combustion and Flame, 161 4: 1015-1025. doi:10.1016/j.combustflame.2013.09.024


Author Brieschenk, Stefan
O'Byrne, Sean
Kleine, Harald
Title Ignition characteristics of laser-ionized fuel injected into a hypersonic crossflow
Journal name Combustion and Flame   Check publisher's open access policy
ISSN 0010-2180
1556-2921
Publication date 2014-04
Year available 2013
Sub-type Article (original research)
DOI 10.1016/j.combustflame.2013.09.024
Open Access Status
Volume 161
Issue 4
Start page 1015
End page 1025
Total pages 11
Place of publication New York, United States
Publisher Elsevier
Collection year 2014
Language eng
Formatted abstract
This paper presents an experimental investigation on the ignition characteristics of laser-ionized fuel injected into a hypersonic air-crossflow. A Q-switched laser causes breakdown in the sonic H2 injector stream before interaction with the air-crossflow traveling at 2km/s with a total specific enthalpy of 2.5MJ/kg. The flowfield is visualized using schlieren imaging and planar laser-induced fluorescence (PLIF) on the NO molecule. The temporal evolution of the ignition process is visualized using PLIF on the OH molecule. We compare the ignition effectiveness, in terms of the OH PLIF signal, between a series of test cases with different injector pressures and laser energies. These results are also compared to a previous study, where the laser-spark was generated in the jet interaction region, outside the fuel injector. The influence of using H2 fuel diluted with Ar, which serves as a plasma buffer gas, to extend plasma lifetimes is also investigated. The ignition technique is found to be effective in terms of post-plasma hydroxyl production, with a significant increase in performance observed when Ar is used as a plasma buffer gas.
Keyword Laser-induced ignition
Plasma-assisted combustion
Scramjets
Supersonic combustion
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Official 2014 Collection
 
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