Abstract
Intracavity laser absorption spectroscopy (ICLAS) and cavity ring-down spectroscopy (CRDS) were used to measure temperature and concentration profiles in low-pressure (30 torr) methane/oxygen/nitrogen flames. Concentration profiles of the HCO and 1CH2 radicals were measured by ICLAS, whereas the OH radical profiles and temperature profiles were measured by CRDS. Flames with equivalence ratio =0.8, 1.0, and 1.2 were studied. HCO profiles and peak amounts agree well with model predictions based on the GRI-Mech 2.11 mechanism for the stoichiometric flame (=1.0). The absolute concentration of singlet CH2 radical could not be determined accurately, because of large uncertainty in the absorption cross section of this radical. Nevertheless, the experimental singlet CH2 concentration seems to be higher than predicted by model (by more than 20 times, based on the estimated cross-section data). The relative 1CH2 profile is very close to the prediction. The OH profiles agree well with model calculation: however, absolute experimental OH peak concentration is about two times lower than the predicted value.
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