Shock-initiated ignition in methane-propane mixtures

Abstract An experimental and modeling study of the preignition oxidation of methane and its sensitization by propane is reported. The ignition delay times were measured behind reflected shock waves at two different locations along the shock tube in 9.5% CH4-19.0% O2-Ar mixtures with 0.19, 0.475, 0.95, and 1.9% C3H8 added. The experiments were performed at a nearly constant density of approximately 2 × 10−5 mol/cm3 over a temperature range of 1300–1600K. A computer model, composed of 140 reactions and 34 species, was able to predict the experimental results obtained in this and earlier studies. The model was subjected to a sensitivity analysis, which was performed using the saturated-design technique. The oxidation of methane during the induction period was found to proceed through three distinct phases: initiation, oxidation of CH3 by O2, and oxidation of CH3 by HO2. The sensitization by propane was found to be primarily determined by the decomposition of the propane molecule.

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