A continuing investigation of the inhibition activity of organophosphorus compounds under a range of equivalence ratios (0.8 to 1.3) and at one atmosphere was performed experimentally and computationally, as measured by the burning velocity. Updates to a previous mechanism were made by the addition and modification of reactions in the mechanism for a more complete description of the recombination reactions. Reaction pathways for HOPO2+H and HOPO+H are analyzed using the BAC-G2 approach. A new reaction pathway for HOPO2+H=PO2+H2O has been identified which results in higher rate constant than has been reported in the literature. In this work, the laminar flame speed is measured experimentally and calculated numerically for a premixed propane/air flame at one atmosphere, under a range of equivalence ratios, undoped and doped (600 PPM) dimethyl methylphosphonate (DMMP). The unburned reactant temperature was 368 K.

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Jayaweera, T. M., Melius, C. F., Pitz, W. J., Westbrook, C. K., Korobeinichev, O. P., Shvartsberg, V. M., Shmakov, A. G., Bolshova, T. A. and Curran, H., "Flame Inhibition by Phosphorus-Containing Compounds over a Range of Equivalence Ratios," Combustion and Flame, in press, 2004; Lawrence Livermore National Laboratory, Livermore, CA, UCRL-CONF-202992.