Induction zone exothermicity of acetylene ignition
Journal Article
·
· Combust. Flame; (United States)
Refractive index gradient profiles in the shock-initiated ignition of C/sub 2/H/sub 2/-O/sub 2/-Ar mixtures were analyzed by means of computer modeling. It was found that product formation in the main route of C/sub 2/H/sub 2/ ignition chemistry proceeds only as far as CO and H/sub 2/O, effectively excluding CO/sub 2/ as a possible product of the reaction of CH/sub 2/ with O/sub 2/ as had been assumed on the basis of earlier modeling results. The elementary reaction rate constant expressions k/sub 8/ = 5.0 x 10/sup 14/ exp(-60kJ/RT)cm/sup 3/ mol/sup -1/s/sup -1/ for C/sub 2/H/sub 2/ + OH ..-->.. CH/sub 2/CO + H,k/sub 9/ = 2.7 x 10/sup 14/ exp(-63kJ/RT)cm/sup 3/ mol/sup -1/s/sup -1/ for C/sub 2/H/sub 2/ + OH ..-->.. C/sub 2/H + H/sub 2/O, and k/sub 18/ = 2.5 x 10/sup 13/ cm/sup 3/ mol/sup -1/s/sup -1/ for CHCO + H ..-->.. CH/sub 2/ + CO were derived in the context of a reaction mechanism consisting of 5 elementary reactions of C/H species, 10 elementary reactions in the H/sub 2/-O/sub 2/-CO system, and 28 reactions of C/H/O species, 4 of which involve electronically excited CH. The same mechanism was found to match laboratory flame speeds and profiles about as well as previously reported mechanisms.
- Research Organization:
- Dept. of Chemistry, Univ. of Texas, Austin, TX 78712
- OSTI ID:
- 6809513
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 67:1; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
090310 -- Inorganic Hydrogen Compound Fuels-- Properties-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKYNES
ARGON
BENCH-SCALE EXPERIMENTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPUTERIZED SIMULATION
DISPERSIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLAME PROPAGATION
FLAMES
FLUIDS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
IGNITION
KINETICS
MIXTURES
NONMETALS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE GASES
REACTION KINETICS
REFRACTIVITY
SHOCK WAVES
SIMULATION
VELOCITY
WATER
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKYNES
ARGON
BENCH-SCALE EXPERIMENTS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTION KINETICS
COMBUSTION KINETICS
COMPUTERIZED SIMULATION
DISPERSIONS
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLAME PROPAGATION
FLAMES
FLUIDS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
IGNITION
KINETICS
MIXTURES
NONMETALS
OPTICAL PROPERTIES
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RARE GASES
REACTION KINETICS
REFRACTIVITY
SHOCK WAVES
SIMULATION
VELOCITY
WATER