Chemical scavenging activity of gaseous suppressants by using laser-induced fluorescence measurements of hydroxyl

We study the suppressant effectiveness of five different gaseous agents: N 2, CO 2, SO 2, CF 3Cl, and CF 3Br. Laser-induced fluorescence is used to determine quantitative hydroxyl concentration profiles in opposed CH 4/N 2-air diffusion flames with and without suppressants. Measurements are made by...

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Bibliographic Details
Published in:Combustion and flame 2001, Vol.126 (1), p.1393-1401
Main Authors: Vora, Namrata, Siow, Jia Eng, Laurendeau, Normand M
Format: Article
Language:English
Subjects:
Applied sciences
Combustion of gaseous fuels
Combustion. Flame
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Theoretical studies. Data and constants. Metering
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Summary:We study the suppressant effectiveness of five different gaseous agents: N 2, CO 2, SO 2, CF 3Cl, and CF 3Br. Laser-induced fluorescence is used to determine quantitative hydroxyl concentration profiles in opposed CH 4/N 2-air diffusion flames with and without suppressants. Measurements are made by using a nitrogen-diluted counter-flow flame with 1% inhibitor added to the air stream. Visual extinction limits are also determined for each suppressant to determine the percent inhibitor in the air stream required for flame extinction. The suppression capabilities of all five agents are compared based on relating laser-induced fluorescence measurements of OH concentration to the visual extinction limits. An inverse correlation is found between the percent reduction in total integrated OH number density and the visual extinction limit. This correlation provides an effective protocol that can thus be used for studying and comparing different fire suppressants.
ISSN:0010-2180
1556-2921
DOI:10.1016/S0010-2180(01)00259-0