Effect of stoichiometry and strain-rate on transient flame response
A parallel low-Mach-number calculational model that is based on a detailed C1C2 chemical mechanism was used to study the interaction of a premixed methane-air flame with a computer-rotating vortex pair, focusing on the transient response of the heat release rate and the flame structure at the centerline of the vortex pair. For vortex pairs of different strengths, the calculations indicated that the heat release rate in the rich flame decays considerably faster than in the stoichiometric flame. This behavior was consistent with experimental measurements. The heat release rate in the lean flame decayed at a slightly slower rate than in the stoichiometric flame. The transient response of flame radicals, e.g., H, CH, OH, and HCO, was also examined. A complex nonlinear dependence of the transient structure on the vortex strength and the stoichiometry was observed. Original is an abstract.
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