The characteristic rich shifting of the maximum adiabatic flame temperature from the stoichiometric value forhydrocarbon/air mixtures is demonstrated to be caused by product dissociation and hence reduced amount of heat release.Since the extent of dissociation is greater on the lean side as a result of the stoichiometry of dissociated products, the peakingoccurs on the rich side. The specific heat per unit mass of the mixture is shown to monotonically increase with increasing fuelconcentration and hence is not the cause of rich shifting in hydrocarbon/air mixtures. It is however the cause for the leanshifting of the maximum adiabatic flame in NmHn/F2 mixtures, even their maximum heat release still peaks on the rich side.
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