Abstract
A physical mechanism is established, responsible for the experimentally observed strong deceleration of the growth rate of the maximum skeleton temperature in a wave of filtration combustion of gases with increasing flow rate. The maximum temperatures of the gas and skeleton become commensurable, and the length of the thermal‐relaxation zone becomes much shorter. A classification of regimes based on the temperature‐heterogeneity criterion ϕ1 is proposed. Explicit analytical solutions are obtained for the wave for ϕ1≪1 and ϕ1→1. A correction to reverse reactions in combustion products is considered. The effect of composition on wave behavior is studied by means of numerical calculations with a detailed kinetic scheme. The activation energy for ultrarich and ultralean methane–air mixtures is evaluated. It is concluded that the limiting efficiency of the heat‐recuperation cycle in the wave is reached as ϕ1→1; methods for maximizing the efficiency are suggested.
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