Large eddy simulations in a wall bounded domain are conducted in order to study the kinematic structure of premixed turbulent flame. The linear model presents a prospect of isolating the effects of each of the physical mechanisms that underly turbulent combustion. In the present study, we investigate the flame structure in the absence of thermodyamic effects such as heat release using this mode...

Methanol and ethanol have been investigated as very high octane fuels for knock control/avoidance in spark ignition engines. Direct injection of the alcohol results in substantial cooling of the cylinder charge, decreasing the chemical kinetic rates that result in autoignition. However, decreasing the temperature of the cylinder charge also affects the initial flame propagation. The purpose of ...

The problem of flame propagation in imperfectly premixed mixtures—mixtures of reactants with variable composition—is considered in this numerical study. We carry out two-dimensional direct numerical simulations of a flame propagating in a globally lean fuel-oxidizer mixture with imposed velocity and composition fluctuations of various intensities. The configuration adopted is that of a flame fr...

We describe the combined influence of heat-loss and strain (characterized here by non-dimensional parameters κ and , respectively) on premixed flame-edges in a two-dimensional counterflow configuration. The problem is formulated as a thermo-diffusive model with a single Arrhenius reaction. In order to help classify the various flame-edge regimes, the non-adiabatic one-dimensional problem which ...