Abstract
A model is presented, with well defined approximations, which seeks to identify and quantify certain parameters associated with the lift-off of premixed flames. A numerical study of the stabilising region indicates that blow-off can be considered as an extinction process and its mechanism ascribed to a local Damkohler number. A characteristic temperature (τ*) close to the adiabatic flame temperature is introduced where blow-off occurs when the temperature is less than τ*. The dimensionless stability parameter defined by the model accounts for the fact that rich flames can tolerate a higher free stream velocity before lift-off than leaner flames. The model is essentially heuristic in that the aim is a global description of the stabilising zone based on a comparatively simple single-step reaction scheme.
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