Abstract
Hydroxyl radical concentrations in laminar, premixed CH4-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 POH were found to be insensitive to the flame temperature and the maximum POH to be about 6×10-3 at T=2000 K in a stoichiometric flame. The rate constant for the prompt NO formation, CH+N2→HCN+N\\dashrightarrow2NO (4), is modified as k4=1.2 ×1012 exp (-13600/RT) by the relation between the amount of prompt NO and the saturation ion current Is. It is also shown from the measurements of NOx, unburnt hydrocarbons H.C., and Is, 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.
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