Measured and computer-simulated hydrocarbon and OH radical profiles in fuel-rich atmospheric-pressure flat flames. Reactions of CH sub 4 and C sub 2 H sub 2

Journal Article · Thu May 31 04:00:00 EDT 1990 · Journal of Physical Chemistry; (USA)

DOI:https://doi.org/10.1021/j100374a028· OSTI ID:6518282

Kaiser, E W ^[1]

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1. Ford Motor Company, Dearborn, MI (USA)

Density-height profiles of CH{sub 4}, C{sub 2}H{sub 2}, and OH, measured in the postflame gas of rich atmospheric-pressure flat flames fueled by methane, ethylene, acetylene, or propane, are compared to computer-simulated profiles generated by using a 69-reaction kinetic mechanism. In the mechanism chosen for the simulation, the acetylene decays in the postflame gas by reaction primarily with OH with a rate constant determined to be k{sub 24} = 9.2 ({plus minus}1.5) {times} 10{sup 11} cm{sup 3}/(mol{center dot}s) at 1,700 K. The superequilibrium pool of partially equilibrated radicals formed in the flame zone decreases toward thermal equilibrium in the postflame gas. Simulation of the OH radical profile shows that recombination of methyl radicals with H toms controls the shape of this profile and also those of the rest of the free-radical pool. As the acetylene density decreases, the methane density rises. The net methane yield per acetylene consumed varies with the fuel used, reaching 35% for the ethylene flame.

• OSTI ID: 6518282
• Journal Information: Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 94:11; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKANES
ALKYNES
CALCULATION METHODS
CHEMICAL ANALYSIS
DATA
DATA ANALYSIS
EXPERIMENTAL DATA
FLAMES
HYDROCARBONS
HYDROXYL RADICALS
INFORMATION
MEASURING INSTRUMENTS
MEASURING METHODS
METHANE
NUMERICAL DATA
ORGANIC COMPOUNDS
RADICALS