TY - JOUR
T1 - Radical concentration profiles in a low-pressure methane-air flame measured by intracavity laser absorption and cavity ring-down spectroscopy
AU - Lozovsky, Vladimir A.
AU - Derzy, Igor
AU - Cheskis, Sergey
N1 - Funding Information:
This research was supported by the Israel Science Foundation administrated by the Israel Academy of Science and Humanities and by the James Franck, German-Israeli Binational Program in Laser Matter Interaction.
PY - 1998
Y1 - 1998
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0032262326&partnerID=8YFLogxK
U2 - 10.1016/S0082-0784(98)80433-5
DO - 10.1016/S0082-0784(98)80433-5
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AN - SCOPUS:0032262326
SN - 0082-0784
VL - 27
SP - 445
EP - 452
JO - Symposium (International) on Combustion
JF - Symposium (International) on Combustion
IS - 1
T2 - 27th International Symposium on Combustion
Y2 - 2 August 1998 through 7 August 1998
ER -