Coupling and quenching in dual-front flames

Abstract eng:
The combustion of mixtures of two very different fuels sometimes leads to the formation of two-front flames with complex propagation and quenching behaviours. A simple, one-dimensional analytical model has been developed to explain previously obtained experimental results. The only interaction between the fronts considered is through the gas phase temperature. The model assumes that the reaction associated with each front starts at some ignition temperature and proceeds at a constant rate. The model predicts three different flame configurations: The fronts are either coupled, with both fuels burning within the same flame zone, de-coupled with a distinct preheat zone, or one of the fuels may not burn at all, playing the role of an inert additive. The results of the model are in very good qualitative agreement with experiments performed on hybrid aluminium-methane mixtures in narrow channels and explain the flame coupling/de-coupling through simple heat transfer considerations.

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