Spectroscopic Studies of Inhibited Opposed Flow Propane/Air Flames

Report No. ARL-TR-2388
Authors: Reed R. Skaggs, Robert G. Daniel, Andrzej W. Miziolek, Kevin L. McNesby, Valeri I. Babushok, Wing Tsang, and Mitchell D. Smooke
Date/Pages: February 2001; 36 pages
Abstract: Planar laser induced fluorescence (PLIF) and laser induced fluorescence are used to measure relative OH concentration profiles and maximum flame temperatures in an atmospheric pressure, opposed flow, propane (C3H8)/air flame. Flame inhibiting agents CF3Br, N2, Fe(CO)5, FM-200, FE-36, DMMP, and PN were added to the flame, and relative OH concentration profiles and peak flame temperatures were measured as each flame approached extinction. The measured OH profiles illustrate that adding N2, FM-200, and FE- 36 to the flame produced smaller changes in OH concentrations relative to CF3Br, implying these agents have chemical inhibition capacities less than CF3Br. However, adding DMMP and Fe(CO)5 to the flame demonstrated chemical inhibition capabilities greater than CF3Br, - with larger changes in OH concentrations; similar trends are observed for peak flame temperatures. CF3Br, PN, DMMP, and Fe(CO)5 have temperature values (1600-1800 K) that are lower than the uninhibited flame peak temperature (2200 K). OH profile widths were measured in the uninhibited flame and in each inhibited flame with inhibitor addition at 50% of determined extinction concentrations. Profile widths for CF3Br, PN, DMMP, and Fe(CO)5 were at least 20% less than the uninhibited flame. Numerical modeling of a stoichiometric, premixed, C3H8/air flame inhibited by DMMP, Fe(CO)5, CF3Br, and N2 indicated DMMP and Fe(CO)5 have greater decreases in burning velocities and OH relative to CF3Br.
Distribution: Approved for public release
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Last Update / Reviewed: February 1, 2001