Energy & Fuels · 2016 · 29 citations · 40 references
EngineeringChemical EngineeringChemistryChemical KineticsCombustionPhysical ChemistryChemical Kinetics ModelingCombustion FundamentalsCombustion KineticsCombustion ProcessesIgnitionKinetic ModelingChemical Kinetics Of IgnitionDetailed Kinetic MechanismsDetailed Reaction MechanismsDimethyl EtherEquivalence RatioEquivalence Ratio EffectsIgnition DelayShock Tube Kinetics
We investigate the role of NO 2 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 NO 2 and DME concentrations are explored. NO 2 promotes DME ignition, and the promoting effect becomes more pronounced at high NO 2 concentrations or low temperatures. NO 2 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 NO 2 on DME ignition.
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