HCO concentration in flames via quantitative laser-induced fluorescence

Wei-Guang Diau*, Gregory P. Smith, Jay B. Jeffries, David R. Crosley

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

11 Scopus citations


Quantitative laser-induced fluorescence (LIF) measurements of the concentration of HCO are made in three 25-torr methane-oxygen-nitrogen flames: fuel lean (Φ = 0.81), near stoichiometric (Φ = 1.07), and fuel rich (Φ = 1.28). LIF is excited in the (000)-(000) band of the B-X system near 258 nm. The LIF signal from the flame is calibrated against nonflame measurements of a known HCO concentration produced by laser photolysis of acetaldehyde. The LIF signal is adjusted for the variation in the fraction of the population of the laser-excited level as the measured temperature changes with position in the flame and for the measured variation in quenching. The resulting concentration measurements agree well with model predictions for the fuel-lean and near-stoichiometric flame. The measurements in the fuel-rich flame are significantly larger than the model predictions; however, these measurements are subject to increased uncertainty due to the large, broadband background in the rich flame.

Original languageEnglish
Pages (from-to)453-460
Number of pages8
JournalSymposium (International) on Combustion
Issue number1
StatePublished - 1 Jan 1998
Event27th International Symposium on Combustion - Boulder, CO, United States
Duration: 2 Aug 19987 Aug 1998


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