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Influence of Buoyant Convection on the Stability of Enclosed Laminar FlamesEnclosed diffusion flames are commonly found in practical combustion systems, such as the power-plant combustor, gas turbine combustor, and jet engine after-burner. In these systems, fuel is injected into a duct with a co-flowing or cross-flowing air stream. In combustors, this flame is anchored at the burner (i.e., fuel jet inlet) unless adverse conditions cause the flame to lift off or blow out. Investigations of burner stability study the lift off, reattachment, and blow out of the flame. There have been numerous studies of flame stability. Relatively few studies have investigated the stability of flames with an oxidizer co-flow, compared with the number of studies on (nearly) free jet diffusion flames. The air flow around the fuel jet can significantly alter the lift off, reattachment and blow out of the jet diffusion flame. In normal gravity, however, the effects of the air flow on flame stability are often complicated by the presence of buoyant convection. A comparison of normal-gravity and microgravity flames can provide clear indication of the influence of forced and buoyant flows on the flame stability. The overall goal of the Enclosed Laminar Flames (ELF) research, described at the following URL site: http://zeta.lerc.nasa.gov/expr/elf.htm, is to improve our understanding of the effects of buoyant convection on the structure and stability of co-flow diffusion flames.
Document ID
19990053988
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Brooker, John E.
(NASA Glenn Research Center Cleveland, OH United States)
Jia, Kezhong
(Iowa Univ. Iowa City, IA United States)
Stocker, Dennis P.
(NASA Glenn Research Center Cleveland, OH United States)
Chen. Lea-Der
(Iowa Univ. Iowa City, IA United States)
Date Acquired
August 19, 2013
Publication Date
May 1, 1999
Publication Information
Publication: Fifth International Microgravity Combustion Workshop
Subject Category
Inorganic And Physical Chemistry
Funding Number(s)
CONTRACT_GRANT: NAG3-1592
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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