Laser spark ignition of a jet diffusion flame

In this work we report preliminary results on the laser ignition of a jet diffusion flame with jet flow rates ranging from 35 ( Re=1086) to 103 cm 3/s ( Re=3197). The laser spark energy of about 4 mJ was used for all the tests. The relative amounts of fuel and air concentrations at the laser focus h...

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Bibliographic Details
Published inOptics and lasers in engineering Vol. 38; no. 5; pp. 217 - 232
Main Authors Phuoc, Tran X, White, C.M, McNeill, D.H
Format Journal Article
LanguageEnglish
Published Oxford Elsevier Ltd 01.11.2002
Elsevier
Subjects
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Theoretical studies. Data and constants. Metering
Methane
Spark ignition
Jet flow
Diffusion flame
Stabilization
Laser irradiation
Hydroxyl
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Summary:In this work we report preliminary results on the laser ignition of a jet diffusion flame with jet flow rates ranging from 35 ( Re=1086) to 103 cm 3/s ( Re=3197). The laser spark energy of about 4 mJ was used for all the tests. The relative amounts of fuel and air concentrations at the laser focus have been estimated using a variant of laser-induced breakdown spectroscopy. The ignition and the flame blow out times were measured using the time-resolved OH emission. Ignition times in the range from 3 to about 10 ms were observed depending on the experimental conditions and they increased towards the rich as well as the lean sides. The early time and late-time OH emissions indicate that chemical reactions during the initial stage of the blast wave expansion are not immediately responsible for the ignition. The ultimate fate of an ignition depends on the reactions at later times which determines whether the gas could undergo a transition from hot plasma to a propagating flame.
ISSN:0143-8166
1873-0302
DOI:10.1016/S0143-8166(01)00173-7