Radical concentration profiles in a low-pressure methane-air flame measured by intracavity laser absorption and cavity ring-down spectroscopy

Vladimir A. Lozovsky, Igor Derzy, Sergey Cheskis

Research output: Contribution to journalConference articlepeer-review

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 φ = 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 (φ = 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.

Original languageEnglish
Pages (from-to)445-452
Number of pages8
JournalSymposium (International) on Combustion
Volume27
Issue number1
DOIs
StatePublished - 1998
Event27th International Symposium on Combustion - Boulder, CO, United States
Duration: 2 Aug 19987 Aug 1998

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