Thermochemical nonequilibrium kinetic models in strong shock waves on air

摘要

In this paper the models of air chemical kinetics are analyzed in the temperature rang from 8000 up to 90000 K. Optimal set of vibrational exchange processes, chemical and plasmachemical reactions in air is stated. The vibrational excitation of O_2 and N_2 molecules as well as the influence of nonequilbrium vibraitonal excitation on dissociation rate of this molecules are examined. The expressions for two-temperature rate constants of chemical reactions (T_v not= T), rate constants of ionization processed and so on are presented. Based on these data the quantitative estimation of various processes contributing to the total mechanism of chemical air kinetics was done using the kinetic simulation of gas flows behind the normal shock wave front. Noticeable influence of thermochemical nonequilibrium on the heat flux is found in the case of low catalytic surface.