Evolution of acoustic disturbances in a chemically reacting gas mixture CO2/CO/O
Yu.N. Grigoryev1, I.V. Ershov1,2
1Federal Research Center for Information and Computational Technologies, Novosibirsk
2Novosibirsk State Agrarian University, Russia
Keywords: acoustic disturbances, nonequilibrium chemical reactions, amplification (attenuation) of high-frequency oscillations, influence of the sign of the thermal effect of the reaction
Abstract
On the basis of a complete system of acoustic equations, the evolution of acoustic disturbances in a high-temperature reactive mixture of carbon dioxide, carbon monoxide, and oxygen CO2/CO/O in the dissociation-recombination reaction, as well as in the nonequilibrium endothermic reaction of CO2 dissociation and exothermic reaction of afterburning of carbon monoxide in oxygen, is investigated. A realistic single-temperature Arrhenius model of chemical kinetics is used. The values of thermodynamic parameters on the trajectory of hypersonic flight in the Martian atmosphere are taken as stationary environmental conditions. For the dissociation-recombination reaction with a negative thermal effect near chemical equilibrium in the asymptotic high-frequency limit, attenuation of acoustic disturbances is shown. Under the same conditions, acoustic disturbances amplify in the nonequilibrium exothermic reaction and attenuate in the nonequilibrium endothermic reaction.
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