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首页> 外文期刊>Journal de Chimie Physique et de Physico-Chimie Biologique >Chemical sturcture od methane and ethane flames
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Chemical sturcture od methane and ethane flames

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Premixed laminar CH_4/O_2/Ar (#PHI# = 0.69; 1; 1.18) and C_2H_6/O_2/Ar (#PHI# = 1) flat flames have been studied at low-pressure. The experimental results were compared with predictions from a deatiled kinetic mechanism including 65 species involved in 454 reactions. Particular attention was given for the key intermediate species CH_3, CH_2O, C_2H_5, C_2H_4, C_2H_2, C_3H_8 and C_3H_6. In methane flames, the fraction of methyl radicals leading to the C_2 oxidation route is found to be very low. The C_1/C_2 coupling is mainly via CH_3 + CH_3 -> C_2H_5 + H reaction and less significantly via CH_3 + CH_3 -> C_2H_4 + H_2 and CH_3 + CH_3 -> C_2H_6. In an ethane flame, the linkage between the C_2 and C_1 oxidation routes occurs muchmore easily, mainly via C_2H_4 + H -> 2 CH_3. However, the reaction of vinyl radicals with molecular oxygen in C_2H_3 + O_2 -> CH_2O + HCO contributes significantly to the formation of CH_2O and HCO. Finally, the C_3 chemistry begins with the formation of both C_3H_6 and C_3H_8 via C_2H_3 + CH_3 -> C_3H_6 and C_2H_5 + CH_3 + M -> C_3H_8 + M.

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