Heat Transfer from A Laminar Jet Methane Flame in A Co-Annular Jet of Oxygen-Enriched Air

The influence of oxygen enrichment of the air co-jet on the combustion of a laminar methane jet diffusion flame is studied experimentally by the measurement of the heat flux transferred to an assembly of heat exchangers with oxygen concentration ranging from 21% to 41% and firing rates ranging from...

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Bibliographic Details
Published in:Combustion science and technology 2014-11, Vol.186 (10-11), p.1491-1501
Main Authors: Gillon, P., Chahine, M., Gilard, V., Sarh, B.
Format: Article
Language:English
Subjects:
Combustion
Convection
Diffusion
Engineering Sciences
Evolution
Flame radiant fraction
Heat exchangers
Heat flux
Heat transfer
Laminar
Laminar diffusion flame
Methane
Oxygen
Oxygen enrichment
Reactive fluid environment
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Summary:The influence of oxygen enrichment of the air co-jet on the combustion of a laminar methane jet diffusion flame is studied experimentally by the measurement of the heat flux transferred to an assembly of heat exchangers with oxygen concentration ranging from 21% to 41% and firing rates ranging from 0.5 to 1.2 kW. It is observed that, as expected, heat flux increases with oxygen concentration; less methane is necessary to produce the same heating effect as oxygen index is increased. The radiant fraction is found to increase with the oxygen concentration. Deducing the convection part, it is shown that convection is highly dependent on the flame regime with a lesser rate of increase when the flame is reattached to the burner. Evolution of the convective coefficient may be used as a detection of the transition from a lifted flame to a flame attached to the burner.
ISSN:0010-2202
1563-521X
DOI:10.1080/00102202.2014.935124