Experimental and kinetic modeling studies on low-temperature oxidation of Polyoxymethylene Dimethyl Ether (DMM1-3) in a jet-stirred reactor

In this paper, based on the pyrolysis kinetics model of DMM1-3 previously constructed, the low-temperature oxidation kinetics model of DMM1-3 (500 K∼950 K) was established by using the jet-stirred reactor (JSR) to conduct low-temperature oxidation experiments of DMM1-3 with different equivalence ratios. The model was fully verified experimentally, and the simulation results can well reproduce the trend of fuel and important intermediate specie concentrations in the temperature range of 500 K ∼ 950 K. 9 species were identified and quantified by GC/MS in the low-temperature oxidation process of DMM1-3. Results show that DMM1 has an oxidative decomposition process after dehydrogenation, while both DMM2 and DMM3 have strong low-temperature oxidation reaction and weak NTC process, but there are certain differences in the specific oxidation process. CH3OCHO and COCOC*O are important intermediates in the low-temperature oxidation process of DMM1-3, and their peak concentrations in the high-temperature region are not affected by equivalence ratios. And the peak concentrations of CH3OCHO and COCOC*O in the low-temperature oxidation experiments of DMM2 and DMM3 increased with decreasing equivalence ratios. The current detailed model and corresponding experimental results can be helpful for the construction of reliable reduced DMMn mechanisms.