Structure and stabilization of stretched premixed flames

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:103007

Law, C K ^[1]

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1. Princeton Univ., NJ (United States)

The present investigation aims to gain fundamental understanding on the structure, response, and dynamics of premixed flames, and relate these understanding to the practical issues such as flame extinction and stabilization. The phenomenology of and results from two specific studies are presented: (1) The temperature and species structure of freely-standing, adiabatic, equidiffusive, aerodynamically-strained, planar premixed flames has been experimentally and computationally investigated. Results show that the structure remains largely similar in response to variations in strain rate, thereby substantiating the concepts that the scalar structure of the flame, and hence the flame thickness, are insensitive to strain rate variations for these purely-strained flames, and that these flames cannot be extinguished by straining alone. (2) The possibility of stabilizing a Bunsen flame without heat loss to the burner rim has been experimentally investigated by examining the temperature at the rim, the temperature gradient between the rim and the flame base, and the standoff distance of the flame base in relation to the flame thickness. Results show that while heat loss remains to be the dominant stabilization mechanism for flames in uniform flows and for strong flames in parabolic flows, adiabatic flame stabilization and blowoff are indeed possible for weak flames in parabolic flows.

• Research Organization: Argonne National Lab., IL (United States)
• DOE Contract Number: FG02-89ER13988
• OSTI ID: 103007
• Report Number(s): CONF-9404137--; ON: DE94017694
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
AIR
COMBUSTION
DYNAMICS
FLAMES
LAMINAR FLOW
METHANE
MIXTURES
STABILIZATION
TEMPERATURE GRADIENTS