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Numerically predicted structure and burning velocity of premixed CO-Ar-O2-H2 flames inhibited by CF3H
Trifluorobromomethane (CF3Br, halon 1301) is a widely used fire suppressant, and progress has been made in understanding its inhibitory mechanism in premixed flames. With the current ban on its production due to its high ozone depletion potential, however, replacements are being considered which are predominantly fluorinated hydrocarbons. Understanding the inhibition mechanisms of these replacements is important for their efficient use, for developing new agents, and for improving the understanding of inhibition by CF3Br. This paper presents the first detailed numerical calculations of the structure of carbon monoxide-hydrogen-oxygen-argon flames inhibited by CF3H. Numerical solution of the equations of mass species, and energy conservation are performed using a chemical kinetic mechanism recently developed at the National Institute of Standards and Technology. The calculated burning velocities are compared with a set of previously published experimental measurements performed by another laboratory which encompass a range of equivalence ratios and argon, hydrogen, and inhibitor mole fractions with corresponding burning velocities of 21 to 199 cm/s. The effects of the inhibitor on the species profiles for the major products, radicals, and fluorinated compounds are determined, and the major reaction pathways for consumption of the inhibitor are discussed. The previously published experimental burning velocities are in good agreement with the results of the present calculations for most of the conditions tested. For those conditions (high fluorine-to-hydrogen ratio in the reactants) where the disagreement is largest, the rate expressions which most influence the burning velocity have been identified. The modeling results indicate that in CO flames (in contrast to hydrocarbon flames) oxygen atom reaction with the inhibitor and inhibitor fragments is a major decomposition pathway, especially when there is a high fluorine-to-hydrogen ratio in the reactants.
Numerically predicted structure and burning velocity of premixed CO-Ar-O2-H2 flames inhibited by CF3H
Trifluorobromomethane (CF3Br, halon 1301) is a widely used fire suppressant, and progress has been made in understanding its inhibitory mechanism in premixed flames. With the current ban on its production due to its high ozone depletion potential, however, replacements are being considered which are predominantly fluorinated hydrocarbons. Understanding the inhibition mechanisms of these replacements is important for their efficient use, for developing new agents, and for improving the understanding of inhibition by CF3Br. This paper presents the first detailed numerical calculations of the structure of carbon monoxide-hydrogen-oxygen-argon flames inhibited by CF3H. Numerical solution of the equations of mass species, and energy conservation are performed using a chemical kinetic mechanism recently developed at the National Institute of Standards and Technology. The calculated burning velocities are compared with a set of previously published experimental measurements performed by another laboratory which encompass a range of equivalence ratios and argon, hydrogen, and inhibitor mole fractions with corresponding burning velocities of 21 to 199 cm/s. The effects of the inhibitor on the species profiles for the major products, radicals, and fluorinated compounds are determined, and the major reaction pathways for consumption of the inhibitor are discussed. The previously published experimental burning velocities are in good agreement with the results of the present calculations for most of the conditions tested. For those conditions (high fluorine-to-hydrogen ratio in the reactants) where the disagreement is largest, the rate expressions which most influence the burning velocity have been identified. The modeling results indicate that in CO flames (in contrast to hydrocarbon flames) oxygen atom reaction with the inhibitor and inhibitor fragments is a major decomposition pathway, especially when there is a high fluorine-to-hydrogen ratio in the reactants.
Numerically predicted structure and burning velocity of premixed CO-Ar-O2-H2 flames inhibited by CF3H
Vorausberechnung der Struktur und Verbrennungsgeschwindigkeit von vorgemischten CO-Ar-O2-H2 Flammen, die durch CF3H inhibiert werden
Linteris, G.T. (author)
Combustion and Flame ; 107 ; 72-84
1996
13 Seiten, 9 Bilder, 4 Tabellen, 42 Quellen
Article (Journal)
English
feuerhemmendes Additiv , Fluorwasserstoff , Kohlenmonoxid , chemisches Radikal , Reaktionsgeschwindigkeit , Reaktionskinetik , Sauerstoff , Wasserstoff , organische Verbindung , Fluorverbindung , Inhibition , praktische Untersuchung , Flamme , Verbrennung (Oxidation) , Temperaturabhängigkeit , numerisches Verfahren , Argon , Reaktionsmechanismus , Verbrennungsgeschwindigkeit
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