Laminar Flame Speeds of Methane-Air Mixtures under Reduced and Elevated Pressures.

摘要

Using the counterflow methodology, the laminar flame speeds of methane-air mixtures have been accurately determined over the pressure range of 0.25-3 atm and over extensive lean-to-rich concentration ranges. These flame speeds are then compared with the numerically calculated values obtained by using various published kinetic schemes of either the C1 mechanism or the full C2 mechanism. Two such schemes show very close agreement with the experimental data. However, available information cannot further differentiate the relative superiority between them for flame speed calculations, especially the importance of C2 reactions for moderately rich situations. Two reduced mechanisms are also deduced through sensitivity analysis and are expected to be useful for flame speed calculations and approximate flame structure studies. Keywords: Flames; Flame speeds; Methane air mixtures; Kinetic schemes. Reprints. (JHD)