Аннотация:Recently estimated and updated quenching rates of O2(a1Δg) by H and H2 have been
added to a known and validated combustion mechanism to predict enhancement
of C2H4 flame propagation in the presence of O2(a1Δg). The results of experiments that
targeted the isolated enhancement of O2(a1Δg) on C2H4 flame propagation were used
as a means to compare the effects of different chain-initiation, chain-branching, and
quenching rates. The ratio of chain-branching to quenching rates of 0.25 to 0.33 for
H+O2(a1Δg) was found to accurately predict the enhancement trends found in the C2H4
flame propagation experiments. The results suggest that flame propagation enhancement
of hydrocarbon fuels may not be strongly dependent on the reactions of intermediate
hydrocarbon fragments with O2(a1Δg) since the dominant pathways may solely lie with
primary radicals such as H.