Collisional quenching of CH(A), OH(A), and NO(A) in low pressure hydrocarbon flames

Journal Article · Sat Aug 01 04:00:00 EDT 1998 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(97)00324-6· OSTI ID:669943

Tamura, Masayuki; Berg, P A; Harrington, J E; Lique, J; Jeffries, J B; Smith, G P; Crosley, D R ^[1]

---

1. SRI International, Menlo Park, CA (United States). Molecular Physics Lab.

Excited state lifetimes have been measured for the A-states of CH, OH, and NO in a number of low-pressure, premixed, laminar flow methane flames. From these lifetimes, collisional quenching rates were determined as a function of height above the burner and thus as a function of flame temperature and composition. The results were compared with values calculated using a model of the flame chemistry to predict collider mole fractions, together with parameterizations of quenching rate coefficients and modeled flame composition data. This indicates that collisional quenching corrections for laser-induced fluorescence measurements can be calculated from knowledge of major species mole fractions and gas temperature. Predicted quenching rates for CH range from agreement with measured values to 27% higher than measured values. This discrepancies suggest insufficient knowledge of high temperature quenching by H{sub 2}O and N{sub 2}.

• OSTI ID: 669943
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3-4 Vol. 114; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
COMBUSTION KINETICS
EXCITED STATES
MATHEMATICAL MODELS
METHANE
NITRIC OXIDE
QUENCHING
RADICALS