Effect of Kinetic Properties of a Mixture on Wave Macrocharacteristics of Filtration Combustion of Gases

On the basis of the latest experimental data using a detailed kinetic model, the influence of kinetic features of ultrarich methaneair mixtures (in comparison with ultralean ones) on the main characteristics of superadiabatic waves of filtration combustion of gases is considered. It is shown that substantially lower concentrations of O, OH, and H radicals are typical of ultrarich mixtures, which results from effective inhibition of atomic hydrogen participating in the chain branching reaction H + O₂ = OH + O by methane in the reaction H + CH₄ = CH₃ + H₂. Therefore, extension of the preheating zone and noticeable expansion of the heatrelease region are typical of rich compositions. A decrease in generation of the main radicals in ultrarich mixtures (as compared to ultralean compositions) leads to an increase in the maximum skeleton temperature by 300– 350 K and to a significant increase in velocity of wavefront propagation.