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Lean flammability limit of downward propagating hydrogen-air flamesDetailed multidimensional numerical simulations that include the effects of wall heat losses have been performed to study the dynamics of downward flame propagation and extinguishment in lean hydrogen-air mixtures. The computational results show that a downward propagating flame in an isothermal channel has a flammability limit of around 9.75 percent. This is in excellent agreement with experimental results. Also in excellent agreement are the detailed observations of the flame behavior at the point of extinguishment. The primary conclusion of this work is that detailed numerical simulations that include wall heat losses and the effect of gravity can adequately simulate the dynamics of the extinguishment process in downward-propagating hydrogen-air flames. These simulations can be examined in detail to gain understanding of the actual extinction process.
Document ID
19920049030
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Patnaik, G.
(Berkeley Research Associates Springfield, VA, United States)
Kailasanath, K.
(U.S. Navy, Naval Research Laboratory, Washington DC, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Subject Category
Inorganic And Physical Chemistry
Report/Patent Number
AIAA PAPER 92-0336
Accession Number
92A31654
Distribution Limits
Public
Copyright
Other

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