Morehart, J. H. and Zukoski, E. E. and Kubota, T. (1992) Chemical Species Produced in Fires Near the Limit of Flammability. Fire Safety Journal, 19 (2-3). pp. 177-188. ISSN 0379-7112 http://resolver.caltech.edu/CaltechAUTHORS:20101130-111539300
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Sustaining a diffusion flame requires sufficient concentrations of fuel and oxidizer to maintain the combustion reaction. When the quantity of oxygen in the environment falls below a minimum value, combustion processes will be extinguished. An experimental technique is described which was used to determine the oxygen concentration in a vitiated environment of combustion products mixed with air which only just supports a large-scale diffusion flame. Measurements were taken of limiting oxygen concentrations and chemical species produced in fires near this flammability limit for methane (natural gas) and ethylene fuels. As limiting conditions were approached, radiation from soot in the reaction zone became imperceptible, leaving only a weakly luminous blue flame. Even with significant reductions in both the flame height and luminosity at these conditions, the fire completely consumed the fuel and generated no measurable amounts of products of incomplete combustion. A comparison of limiting oxygen concentrations and limiting flame temperatures for these experiments with the results of other investigations shows reasonably good agreement despite widely varying experimental techniques.
|Additional Information:||© 1992 Elsevier. Received 5 March 1990, revised version received 6 March 1991, accepted 10 May 1991. Available online 27 February 2003.|
|Group:||Guggenheim Jet Propulsion Center|
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|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Ruth Sustaita|
|Deposited On:||30 Nov 2010 20:21|
|Last Modified:||26 Dec 2012 12:41|
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