Inhibition of premixed methane-air flames by fluoroethanes and fluoropropanes

Journal Article · Wed Apr 01 04:00:00 EST 1998 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(97)00216-2· OSTI ID:619598

Linteris, G T; Burgess, Jr, D R; Babushok, V; Zachariah, M; Tsang, W ^[1]; Westmoreland, P ^[2]

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1. National Inst. of Standards and Technology, Gaithersburg, MD (United States)
2. Univ. of Massachusetts, Amherst, MA (United States)

This paper presents experimental and modeling results for laminar premixed methane-air flames inhibited by the fluoroethanes C{sub 2}F{sub 6}, C{sub 2}HF{sub 5}, and C{sub 2}H{sub 2}F{sub 4}, and experimental results for the fluoropropanes C{sub 3}F{sub 8} and C{sub 3}HF{sub 7}. The modeling results are in good agreement with the measurements with respect to reproducing flame speeds. For the fluoroethanes, calculated flame structures are used to determine the reaction pathways for inhibitor decomposition and the mechanisms of inhibition, as well as to explain the enhanced soot formation observed for the inhibitors C{sub 2}HF{sub 5}, C{sub 2}H{sub 2}F{sub 4}, and C{sub 3}HF{sub 7}. The agents reduce the burning velocity of rich and stoichiometric flames primarily by raising the effective equivalence ratio and lowering the adiabatic flame temperature. For lean flames, the inhibition is primarily kinetic, since inhibitor reactions help to maintain the final temperature. The peak radical concentrations are reduced beyond that due to the temperature effect through reactions of fluorinated species with radicals.

• OSTI ID: 619598
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 1-2 Vol. 113; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
COMBUSTION KINETICS
FIRE EXTINGUISHERS
FLAME PROPAGATION
FLAMES
FLUORINATED ALIPHATIC HYDROCARBONS
INHIBITION
MATERIAL SUBSTITUTION
MATHEMATICAL MODELS
METHANE
MORPHOLOGY
SOOT