Approximate local mathematical descriptions of turbulent Bunsen flames in the flamelet regime

Simplified conservation equations are presented for describing properties of turbulent premixed Bunsen burner flames measured at local points in the flame brush, in the flamelet regime. These equations enable velocity changes across flamelets to be addressed and facilitate mathematical analyses of local gas motions before and after flamelet passage. Different simplified models are pursued in efforts to determine whether buoyancy or hydrodynamic adjustments are more important in affecting burnt-gas velocity fluctuations. Deductions drawn from analysis of these equations are shown to be consistent with experimental results. It is suggested that further, more detailed analyses may demonstrate the dominance of hydrodynamic adjustments in the burnt gas.