Abstract
We have studied three rich, low-pressure C2H2/O2/Ar flames (Ø=1.03, 1.67, and 2.0, P=25 Torr). Thermocouples and OH laser-induced flourescence are used to measure the temperature. Quartz-microprobe sampling is used to measure concentrations of the stable species, LIF to measure concentrations of CH and OH, and multiphoton-excited fluorescence to measure H-atom concentrations. The measurements are compared with the predictions of a comprehensive chemical kinetic model. The agreement between model and experiment is generally good. Possible sources of the discrepancies are discussed. Analysis of the reaction mechanism clearly shows the importance of reactions of 1CH2 in rich acetylene flames, particularly in the formation of higher hydrocarbons.
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