Influence of temperature and hydroxyl concentration on incipient soot formation in premixed flames
Critical equivalence ratios have been measured as a function of temperature (1600-1880K) for premixed flames at atmospheric pressure. The five fuels studied are methane, ethane, propane, ethylene, and acetylene. The flames were stabilized on a flat flame burner and the temperatures were measured using sodium D-line reversal. A linear relationship is found between 1n phi/sub C/ and 1/T for each fuel. Based on a global kinetic model in which soot precursors are formed by fuel pyrolysis and oxidized by OH, a predictive correlation has been developed which shows the influence of temperature, OH concentration, and C/H ratio on sooting tendency. This correlation describes all of the measured phi/sub C/ versus temperature data, suggesting that the overall mechanism of soot formation is similar among aliphatic fuels.
- Research Organization:
- Flame Diagnostics Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
- OSTI ID:
- 5598162
- Journal Information:
- Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 64:1; ISSN CBFMA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
034000 -- Natural Gas-- Combustion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400800* -- Combustion
Pyrolysis
& High-Temperature Chemistry
ACETYLENE
ALKALI METALS
ALKANES
ALKENES
ALKYNES
ATMOSPHERIC PRESSURE
BURNERS
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COMBUSTION KINETICS
COMBUSTION PROPERTIES
CORRELATIONS
DECOMPOSITION
ELEMENTS
ETHANE
ETHYLENE
FLAME PROPAGATION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
KINETICS
METALS
METHANE
ORGANIC COMPOUNDS
OXIDATION
OXYGEN COMPOUNDS
PRODUCTION
PROPANE
PYROLYSIS
QUANTITY RATIO
REACTION KINETICS
SODIUM
SOOT
THERMOCHEMICAL PROCESSES
VERY HIGH TEMPERATURE
YIELDS