Chemical Reactions in the Low-Temperature Zone of a Laminar Rich Propane-Air Flame

摘要

The mechanism of chemical reactions in the low-temperature zone of a rich propane-air flame is considered.It is shown that at temperatures of 300-700 K,intense chemical reactions proceed with the formation of end products and that the water concentration reaches an intermediate equilibrium value even at a temperature of 685 K.In this zone of the front,the diffusion of atomic hydrogen from the high-temperature zone plays a determining role and water is formed mainly by the reactions H+O_2+M=> HO_2+M,HO_2+HO_2=> H_2O_2+O_2,H_2O_2 (+M)=>2OH (+M),C_3H_8+OH=>-C_3H_7+H_2O.Propane reacts with active centers more effectively than molecular hydrogen.Its primary reactions are due to the interaction with OH and HO_2 radicals.Arguments are given in favor of the thermal-diffusion nature of the superadiabatic temperature phenomenon in rich propane-air flames.