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Experimental and Kinetic Modeling Study of CH3OCH3 Ignition Sensitized by NO2

Ye, W., Shi, J. C., Zhang, R. T., Wu, X. J., Zhang, X., Qi, M. L., Luo, S. N.
Energy & Fuels 2016 v.30 no.12 pp. 10900-10908
combustion, kinetics, nitrogen dioxide, reaction mechanisms, temperature
We investigate the role of NO₂ in dimethyl ether (DME) ignition with a combustion shock tube. Ignition delay times are measured at 987–1517 K and 4 and 10 atm. Different equivalence ratios (0.5, 1.0, and 2.0) and NO₂ and DME concentrations are explored. NO₂ promotes DME ignition, and the promoting effect becomes more pronounced at high NO₂ concentrations or low temperatures. NO₂ addition also augments the influence of the equivalence ratio on ignition delay times. Four detailed reaction mechanisms from the literature are examined against the measurements, and an updated kinetic model is proposed and validated in comparison to experiments. On the basis of the updated model, sensitivity analysis, reaction flux analysis, and rate of production analysis are conducted to provide details on the kinetic effect of NO₂ on DME ignition.