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- W2030494764 abstract "The reflected shock region of a conventional shock tube was used to study soot formation from rich methane combustion. The combustion environment, reactant partial pressures of approximately one atmosphere, and temperature exceeding 1800 °K, simulated conditions in practical systems. The simultaneous time-resolved observation of ion precursors, ions and neutral species along with the nascent soot particles in the homogeneous reflected core region provided unambiguous kinetic data about the earliest stages of soot formation. Emission spectra of CH0 (4315 ) and C2 0(5165 ) and Langmuir probe current histories of chemi-ions paralleled each other and changed radically in appearance from fuel-lean combustion to rich combustion conditions. Electric fields of moderate intensity were applied across the reaction zone to control ion-electron recombination. At equivalence ratios less than two, the soot production was extinguished while at equivalence ratios approaching three, an enhancement of soot formation was achieved. These observations confirm the presence of a previously proposed dual nucleation path. An analytical study of the gas-phase reaction mechanism prior to the nucleation of soot was undertaken using existing rate data. The effects of electric fields were modeled by eliminating the ion-electron recombination step since the electron concentration will be drastically reduced in an electric field of appreciable strength. The analytical results suggest that the dual nucleation path is a tenable concept in the combustion system studied." @default.
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- W2030494764 date "1977-01-01" @default.
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- W2030494764 title "Soot nucleation kinetics in premixed methane combustion" @default.
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- W2030494764 doi "https://doi.org/10.1016/s0082-0784(77)80362-7" @default.
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