Staring with a three-ste4p reduced chemicstyr description that employes H_2 and CO as the only intermediates not in steady state,a simplified formulation aimed at facilitating numericla computations of non-premixed methane-air systems is develoed.The analysis retains finite rates for radical recombination and CO oxidation but assumes infinitely fast fuel consumption taking place in a diffusion-controlled manner in an infinitely thin reaction sheet.To remove stiffness associated with the fast fuel consumption,the conservation equations for the major species and the temperature are written n terms of geenralized coupling funcitons that for predictive accuracy permit species diffusivities that differ from the thermal diffusivity.
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