Oh radical nonequilibrium in methane-air flat flames

Journal Article · Fri Jan 01 04:00:00 EST 1982 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(82)90062-1· OSTI ID:5440629

Cattolica, R J

The OH radical concentration and rotational temperature was measured in atmospheric pressure methane-air flat flames using absorption spectra obtained with a tunable dye laser. The OH radical nonequilibrium and the associated recombination in the post flame gases were observed for fuel-air equivalence ratios of 0.8, 0.9, 1.0, 1.1, 1.2. The predicted peak OH concentrations from one-dimensional laminar flame models were found to be in good agreement with the measured values. The OH decay profiles were consistent with a second-order dependence of the decay on the OH concentration. Although this dependence is associated with the recombination chemistry for the fuel-rich flames, it appears that for the lean flames diffusional transport is responsible. The OH decay rate constant was nearly the same for the stoichiometric and lean conditions, but was found to increase substantially for the fuel-rich conditions. 30 refs.

• Research Organization: Sandia Natl Lab, Livermore, CA
• OSTI ID: 5440629
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 44:1-3; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
035000 -- Natural Gas-- Storage-- (1989-)
090110* -- Hydrocarbon Fuels-- Properties-- (1979-1989)
10 SYNTHETIC FUELS
ALKANES
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
DYE LASERS
FLAMES
FUEL-AIR RATIO
HYDROCARBONS
HYDROXYL RADICALS
KINETICS
LASERS
LIQUID LASERS
METHANE
ORGANIC COMPOUNDS
RADICALS
REACTION KINETICS