Actions for Extinction Limits of Nonadiabatic, Catalyst-Assisted Flames in Stagnation-Point Flow [electronic resource].

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Extinction Limits of Nonadiabatic, Catalyst-Assisted Flames in Stagnation-Point Flow [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 2001.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
30 pages : digital, PDF file
Additional Creators
Sandia National Laboratories, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
An idealized geometry corresponding to a premixed flame in stagnation-point flow is used to investigate the effects of catalysis on extending the extinction limits of on adiabatic stretched flames. Specifically, a surface catalytic reaction is assumed to occur on the stagnation plane, thereby augmenting combustion in the bulk gas with a exothermic surface reaction characterized by a reduced activation energy. Assuming the activation energies remain large, an asymptotic analysis of the resulting flame structure yields a formula for the extinction limit as a function of various parameters. In particular, it is demonstrated that the presence of a surface catalyst can extend the burning regime, thus counterbalancing the effects of heat loss and flame stretch that tend to shrink it. The analysis is relevant to small-volume combustors, where the increased surface-to-volume ratio can lead to extinction of the nonadiabatic flame in the absence of a catalyst.
Report Numbers
E 1.99:sand2001-8172
sand2001-8172
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
02/01/2001.
"sand2001-8172"
Timothy J. Gardner; Stephen B. Margolis.
Type of Report and Period Covered Note
Topical;
Funding Information
AC04-94AL85000
View MARC record | catkey: 14393867