MEASUREMENT OF HYDROXYL RADICAL DURING SUPPRESSION OF LOW PRESSURE OPPOSED FLOW METHANE/AIR DIFFUSION FLAMES BY FE(CO)s, CFsBR, AND N2 | NIST

Laser-induced fluorescence and emission spectroscopy are used to measure hydroxyl radical (OH) in reduced pressure, non-premixed, opposed flow CHdair flames suppressed by N2, CF?Br, and Fe(C0)S. For the flames studied, the decrease in OH concentration is found to be proportional to the amount of suppressant added. Suppression by Fe(C0)s is shown to affect flame temperatures to a greater extent than suppression by N2 or CF3Br.