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Localized forced ignition of turbulent stratified mixtures (〈〉 = 1,  = 0.2) with different values of mixture inhomogeneity has been analyzed based on Direct Numerical Simulations (DNS) for different values of Karlovitz number (Ka) corresponding to the premixed turbulent combustion regime diagram. The initial values of turbulent fluctuations (i.e. u’/Sb( = 1) ) and the integral length scale of turbulence (i.e. L11/lf) have been modified to bring about the change in Ka. The localized ignition is accounted by a source term in the energy transport equation which deposits energy over a specified time interval. It has been found that combustion takes place predominantly under a premixed mode of combustion following successful ignition. The percentage of heat release due to a premixed mode of combustion increases with increasing Ka due to high mixing rate. An increase in Ka has been shown to have adverse effects on the burned gas mass. The different level of mixture inhomogeneity shown to have favorable effect with increasing Ka for sustaining combustion. Furthermore, a stratified combustion mixture has been found to be a more favorable choice over homogeneous mixtures for a given turbulent flow condition for sustaining combustion.

Effects of Combustion Regimes on Localized Forced Ignition of Turbulent Stratified Mixture