Title

An Investigation Of The Suppression Mechanism Of Cf3Br Using The Reduced Kinetic Mechanisms For Premixed Hydrogen-Air-Cf3Br Flames

Keywords

Burning velocity; Fire; Flame suppression; Halon; Mechanism

Abstract

The effectiveness of Halon 1301 (CF3Br) in flame inhibition was investigated by studying the premixed H2-Air flame using a simplified mechanism based on the original NIST CF3Br mechanism. The simplified mechanism was capable of reproducing the detailed flame structure of the full mechanism including the flame temperature, burning velocity and species concentrations. The reaction rates of two crucial elementary reactions in the CF3Br chemistry were then revised based on the recent theoretical considerations and were optimized with the existing measurements. The resulting simplified mechanism consisted of 28 elementary reactions and was capable of reproducing the measured unstretched laminar burning velocities of the premixed H2-Air-CF3Br flames for a wide range of fuel equivalence ratios and up to 2% of CF3Br addition. The new mechanism also showed that there were two separate pathways in H atom abstraction due to CF3Br addition: the initial low temperature scavenging of H by CF3Br, and the catalytic destruction of H atoms through HBr+H=Br+H2 and Br+H+M=HBr+M in the main flame zone. The simplified mechanism was further reduced to a five-step global mechanism that was able to retain the accuracy of the detailed mechanism.

Publication Date

1-1-2005

Publication Title

Chemical and Physical Processes of Combustion - 2005 Technical Meeting of the Eastern States Section of the Combustion Institute

Number of Pages

72-75

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84946220199 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84946220199

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