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Title: A New Type of Steady and Stable, Laminar, Premixed Flame in Ultra-Lean, Hydrogen-Air Combustion

Ultra-lean, hydrogen-air mixtures are found to support another kind of laminar flame that is steady and stable beside flat flames and flame balls. Direct numerical simulations are performed of flames that develop into steadily and stably propagating cells. These cells were the original meaning of the word"flamelet'' when they were observed in lean flammability studies conducted early in the development of combustion science. Several aspects of these two-dimensional flame cells are identified and are contrasted with the properties of one-dimensional flame balls and flat flames. Although lean hydrogen-air flames are subject to thermo-diffusive effects, in this case the result is to stabilize the flame rather than to render it unstable. The flame cells may be useful as basic components of engineering models for premixed combustion when the other types of idealized flames are inapplicable.
Authors:
;
Publication Date:
OSTI Identifier:
935707
Report Number(s):
LBNL-725E
TRN: US200816%%852
DOE Contract Number:
DE-AC02-05CH11231
Resource Type:
Journal Article
Resource Relation:
Journal Name: Proceedings of the Combustion Institute; Journal Volume: 32
Research Org:
Ernest Orlando Lawrence Berkeley National Laboratory, Berkeley, CA (US)
Sponsoring Org:
Computational Research Division
Country of Publication:
United States
Language:
English
Subject:
08; 97; COMBUSTION; FLAMES; FLAMMABILITY; LAMINAR FLAMES; MIXTURES cellular, laminar, lean, hydrogen-air, thermo-diffusive instability