V. Basevich, A. Belyaev, S. Medvedev
May 13, 2015
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0
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Journal
Russian Journal of Physical Chemistry B
Abstract
The aim of the study is to construct a detailed kinetic mechanism of the oxidation and combustion of isobutane, capable of describing both the high-temperature process and the multistep process at low temperatures. Isobutane was chosen because it is the first member of the homologous series of isomerized alkanes, with isooctane, a higher member of the series, exhibiting a multistage autoignition in experiment. It is shown that, under certain conditions, the autoignition of isobutane occurs in three stages, typical of normal alkanes and isooctane: cool and blue flames and a hot explosion. The proposed detailed kinetic mechanism is used to calculate the ignition delay time and laminar flame speed, with the simulation results being compared with the available experimental data. A satisfactory qualitative and quantitative agreement is observed. Autoignition during compression and an increased knock resistance of isobutane with respect to autoignition in internal combustion engines is considered. The anti-knock properties of isobutane are demonstrated to be better than those of normal butane.