Lean Flame Propagation with Competing Chemical Reactions†

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Abstract
The steady propagation of a planar flame through a premixed combustible mixture is studied for the case in which the mixture contains two distinct fuels which compete for available oxidizer. It is assumed that sufficient oxidizer is present in the unburned mixture to allow for eventual complete burning of both fuels. Employing the method of matched asymptotic expansions to derive a solution for large activation energies, the propagation velocity U and the effective separation distance H between the points where the two chemical reactions go to completion are determined as functions of standard flame parameters. The analysis extends a recent study by Margolis and Matkowsky (1982a) to include the effects of stoichiometry on flame propagation with multiple fuels.