Radical Concentrations and Prompt NO Formation in Hydrocarbon-Air Premixed Flames

概要

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Hydroxyl radical concentrations in Iaminar, premixed CH_4-air flat-flames were measured by a conventional absorption method in the flame temperature range T=2200-1700 K. The OH mole fractions in the reaction zone P_<OH> were found to be insensitive to the flame temperature and the maximum P_<OH> to be about 6×10^<-3> at T=2000K in a stoichiometric flame. The rate constant for the prompt NO formation, CH+-N_2=HCN-l-N- - - +2N0 (4), is modifiedas k_4=1.2×10^12 exp (-13600/RT) by the relation between the amount of prompt NO and the saturation ion current I,.It is also shown from the measurements of NO_x, unburnt hydrocarbons H.C., and I_x that the chemical kinetics are not significantly influenced by the flame temperature, and NO emission is reduced by reactions among NO, H.C., and N-containing intermediate species in low-temperature flames, even in stoichiometric and fuel-lean mixtures.
社団法人応用物理学会の論文
1985-05-20