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A theoretical analysis of the extinction limits of a methane-air opposed-jet diffusion flameA theoretical analysis is described for a methane-air diffusion flame stabilized in the forward stagnation region of a porous metal cylinder in a forced convective flow. The analysis includes effects of radiative heat loss from the porous metal surface and finite rate kinetics but neglects the effects of gravity. The theoretically predicted extinction limits compare well with experimentally observed extinction limits from the literature. After the predicted limits compared well with the experimental limits, a parametric study of the effect of fuel surface emissivity and Lewis number was conducted with the numerical model. It was found that the computed blowoff limit is independent of radiative heat loss for high fuel blowing velocities but is a strong function of Lewis number. At low fuel blowing velocities, the extinction limit varies with both radiative heat loss and Lewis number. It is discovered, however, that even if thermal losses from the fuel surface are absent, the flame can extinguish at the fuel surface independently of Lewis number due to excessive reaction zone thinning.
Document ID
19880029270
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Olson, S. L.
(NASA Lewis Research Center Cleveland, OH, United States)
T'Ien, J. S.
(Case Western Reserve University Cleveland, OH, United States)
Date Acquired
August 13, 2013
Publication Date
November 1, 1987
Publication Information
Publication: Combustion and Flame
Volume: 70
ISSN: 0010-2180
Subject Category
Inorganic And Physical Chemistry
Accession Number
88A16497
Funding Number(s)
CONTRACT_GRANT: NSF MEA-81-15339
Distribution Limits
Public
Copyright
Other

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