Abstract

We have employed tunable diode laser absorption spectroscopy (TDLAS) to characterize low-pressure premixed CH₄/O₂/Ar flames inhibited with Halon 1301 (CF₃Br) and the candidate Halon alternative compounds FE-13 (CF₃H) and HFC-125 (C₂F₅H). This work is part of a larger program designed to help identify replacement fire-suppression compounds for the currently used Halon 1301. We have used CO two-line thermometry to profile the temperature in low-pressure laminar flames and have determined concentration profiles for a large number of flame species, including reactive intermediates. To date, we have detected 12 flame species by using TDLAS in our laboratory and report on seven of them here: CH₄, H₂O, CO, CF₂O, CF₂H₂, CF₃H, and CF₄. To the best of our knowledge, this is the first time the last four species have been observed in flame by the use of TDLAS. Our data are important for validating the detailed kinetic mechanisms of chemical flame inhibition. Our results indicate that TDLAS is a versatile and powerful diagnostic technique for studying combustion processes.

© 1996 Optical Society of America

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