Experimental study of the effect of methanol on the n-heptane premixed laminar flame

An experimental study of the low pressure premixed laminar methanol/n-heptane/oxygen/ argon flame with the methanol mole fraction blend ratio of 0%, 11%, 28%, 50% was performed with the tunable synchrotron vacuum ultra-violet (VUV) photoionization and molecular-beam sampling mass spectrometry. 62 kinds of combustion intermediates and final products were detected as well as their mole fractions. The results show that the consumption rate of n-heptane and the dissociation of large molecular are not impacted by the methanol addition, the effect of methanol behaviors at the small C1 and C2 moleculars. The oxidation rate of methanol is larger than that of n-heptane, so with the methanol addition increase, the overall reaction rate increases. At the same time the equivalent concentrations of methyl, acetylene, ethyl, ethane and ketene decrease with the increase of methanol but formaldehyde and acetaldehyde increase. The experiment provides the valuable data for the validation of mechanism in the future.