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Premixed flame response to unsteady strain-rate and curvature [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:
25 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:
The interaction of a premixed stoichiometric methane-air flame with a counter-rotating vortex-pair is studied using a skeletal C₁ chemical description of the reaction process. The focus is on the modification to flame structure and dynamics due to unsteady strain-rate and curvature. The detailed description of flame structure and dynamics in response to unsteady flow is necessary to establish relevant extinction criteria in unsteady multi-dimensional flow, which, based on recent experimental evidence, may be significantly different from those of steady one-dimensional counterflow stagnation flames. Present results suggest that the increasing unsteady tangential strain-rate causes modification of flame structure that leads to reduced reaction rates of key chain-branching reactions which are active on the products side of the flame. This causes a reduction in the concentrations of active radicals, such as H, OH, and O, which are necessary for the breakdown of hydrocarbons on the reactants side of the flame.
Report Numbers:
E 1.99:sand--96-8514c
E 1.99: conf-960772--11
conf-960772--11
sand--96-8514c
Subject(s):
Other Subject(s):
Note:
Published through SciTech Connect.
05/01/1996.
"sand--96-8514c"
" conf-960772--11"
"DE96008707"
26. international symposium on combustion, Naples (Italy), 28 Jul - 2 Aug 1996.
Wyckoff, P.S.; Najm, H.N.
Funding Information:
AC04-94AL85000
View MARC record | catkey: 14659377