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The Coherent Flame Model for Turbulent Chemical Reactions

Marble, Frank E. and Broadwell, James E. (1977) The Coherent Flame Model for Turbulent Chemical Reactions. TRW-29314-6001-RU-00. Project SQUID (Purdue University) . http://resolver.caltech.edu/CaltechAUTHORS:20101210-105056861

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Abstract

A description of the turbulent diffusion flame is proposed in which the flame structure is composed of a distribution of laminar diffusion flame elements, whose thickness is small in comparison with the large eddies. These elements retain their identity during the flame development; they are strained in their own plane by the gas motion, a process that not only extends their surface area, but also establishes the rate at which a flame element consumes the reactants. Where this flame stretching process has produced a high flame surface density, the flame area per unit volume, adjacent flame elements may consume the intervening reactant, thereby annihilating both flame segments. This is the flame shortening mechanism which, in balance with the flame stretching process, establishes the local level of the flame density. The consumption rate of reactant is then given simply by the product of the local flame density and the reactang consumption rate per unit area of flame surface. The proposed description permits a rather complete separation of the turbulent flow structure, on one hand, and the flame structure, on the other, and in this manner permits the treatment of reactions with complex chemistry with a minimum of added labor. The structure of the strained laminar diffusion flame may be determined by analysis, numerical computation, and by experiment without significant change to the model.


Item Type:Report or Paper (Technical Report)
Additional Information:© 1977, January, Other Information: Prepared in cooperation with TRW Defense and Space Systems Group, Redondo Beach, Calif. Rept. no. TRW-29314-6001-RU-00. U.S. government authored or collected reports written by Purdue Univ. Lafayette in project SQUIDHEADQUARTERS. Final rept. 1 Mar 1975-31 Jan 1977. The authors thank F. E. Fendell and D. Haflinger for making this modification and for obtaining the computer results that are presented.
Group:Guggenheim Jet Propulsion Center
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)N0001475C1143
Project SQUID4965-52
Project SQUID8960-18
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Guggenheim Jet Propulsion CenterUNSPECIFIED
Record Number:CaltechAUTHORS:20101210-105056861
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20101210-105056861
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21293
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:15 Dec 2010 19:27
Last Modified:26 Dec 2012 12:44

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