MODELING OF CONFINED AUXILIARY FLOW STABILIZED PREMIXED FLAMES

This paper reports the theoretical investigation using finite difference method, of a turbulent premixed flame stabilized in methane-air mixtures by a high velocity hot auxiliary flow. The flow considered is two dimensional, turbulent and reacting. To predict the mixing and combustion characteristics satisfactorily the eddy break up model of Spalding has been improved and used with Prandtl mixing length model for predicting hydrodynamics. The improved model is found to give satisfactory predictions in those regions of flame where mixing controls the rate of combustion. The difficulties encountered in other regions are discussed. The predictions have been compared with the experimental results of Moreau et al. It is found that the improvement incorporated in the eddy break up model is capable of predicting the mixing and combustion characteristics satisfactorily.