Filtration combustion of a gas in a semiinfinite porous medium

An asymptotic analysis of the combustion of a gas moving in a semiinfinite porous medium is performed for large values of the Zel'dovich parameter. Th e case of a highly porous medium with high gas permeability is considered, The basic terms of asymptotic expansions of the main parameters of the proc ess for combustion and separation regimes are obtained by the method of joi ned asymptotic expansions. The effect of the rate of motion of the gas and heat transfer from the surface of the skeleton into the ambient medium on t he combustion parameters is analyzed, The critical conditions of failure of stationary combustion at the external surface of the layer and the conditi ons of transition of the process to the separation and induction regimes ar e determined.