Numerical calculation of the quenching of stretched laminar flames in H$_2$ + and CH$_4$ + air mixtures

We have calculated numerically the equations of hydrodynamics and heat and mass transfer, describing the structure of normal and stretched flames, with consideration given to the detailed kinetics of the chemical conversion, multicomponent diffusion, and thermal diffusion. We have found the limit stretching intensities of double and single hydrogen-and methane-air flames, determining flame separation over a broad range of variations in the original mixture. We have calculated the velocities of the corresponding normal flames and we have determined the possibilities of simplifying the original model of molecular transfer.