INHIBITION OF PREMIXED HYDROGEN-AIR FLAMES BY 2-H HEPTAFLUOROPROPANE

The results of an experimental and numerical modeling study on the inh ibition chemistry of CF3CHFCF3 are presented. Burner-stabilized, lamin ar, premixed, hydrogen-air flat flames with 1.0 and 3.2 mol % inhibito r added were studied as a function of equivalence ratio. The measured concentration profiles of stable species in the postflame gases were m odeled with recently developed chemical kinetic mechanisms, augmented with estimated rate and thermochemical data germane to the oxidation o f the inhibitor. Agreement between experimental and modeled profiles i s adequate for most measured species, thereby partially validating the kinetic data used. Calculated reaction fluxes for 3.7 mol % inhibitor revealed that suppression of H atoms is effected by conversion to HF through reactions with fluorinated species. In contrast, suppression o f OH was found to be less effective. (C) 1998 by The Combustion Instit ute.