Mechanism of Upper Temperature Limits in a Wave of Filtration Combustion of Gases |
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Authors: | S I Futko |
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Affiliation: | (1) Belarusia National Academy of Sciences, Institute of Heat and Mass Transfer, Minsk, 220072 |
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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 thermalrelaxation zone becomes much shorter. A classification of regimes based on the temperatureheterogeneity criterion 1 is proposed. Explicit analytical solutions are obtained for the wave for 11 and 11. 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 heatrecuperation cycle in the wave is reached as 11; methods for maximizing the efficiency are suggested. |
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Keywords: | filtration combustion limiting efficiency heatrecuperation cycle" target="_blank">gif" alt="dash" align="MIDDLE" BORDER="0">recuperation cycle superadiabatic effect effect of the composition detailed simulation ultrarich mixtures |
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