The addition effect of CH3Br on methane ignition behind reflected shock waves

The addition effect of CH3Br on the ignition of methane was investigated in the temperature range of 1537-1920 K behind reflected shock waves. The ign ition delay times were measured by the sudden increase of pressure and OH e mission in the CH4-O-2-Ar system containing small amount of CH3Br. The dela y times of mixtures with CH3Br were shorter than those without CB3Br. The p romotion of ignition by CH3Br was caused by the relative fast decomposition rate in additive. To clarify the addition effect of CH3Br from the viewpoi nt of the reaction mechanism, computational analyses were performed in CH4- CH3Br-O-2-Ar mixtures.