Abstract
The current work presents the results of an experimental study of the intermediates formed during ignition of methyl butanoate (C 5H 10O 2) and air mixtures. A rapid-sampling system and the University of Michigan rapid compression facility were used to acquire gas samples at conditions of P = 10.2 atm and T = 985 K using mixtures of χ mb = 0.96%, χ O 2 = 20.79%, χ N 2 = 52.89%, and χ Ar = 25.25% (mole fraction, percent basis); corresponding to ϕ = 0.30 and an inert gas to O 2 molar ratio of 3.76. The samples were analyzed using gas chromatography. Quantitative measurements of mole fraction time-histories of methane, ethane, propane, ethene, propene, and 1-butene are compared with model predictions based on a reaction mechanism developed in previous work. The methane and ethene time-histories are in excellent agreement (within ∼20%), while propene and ethane are underpredicted by the model. Sensitivity analysis shows ignition is controlled primarily by competition between H 2O 2 and HO 2 kinetics at these conditions. Reaction path analysis shows the methyl butanoate fuel consumption is dominated by H-atom abstraction by OH.
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