Abstract
A numerical simulation of the ignition and combustion of hydrocarbon-hydrogen-air homogeneous and heterogeneous (gas-drop) ternary mixtures for three hydrocarbon fuels (n-heptane, n-decane, and n-dodecane) is for the first time performed. The simulation is carried out based on a fully validated detailed kinetic mechanism of the oxidation of n-dodecane, which includes the mechanisms of the oxidation of n-decane, n-heptane, and hydrogen as constituent parts. It is demonstrated that the addition of hydrogen to a homogeneous or heterogeneous hydrocarbon-air mixture increases the total ignition delay time at temperatures below 1050 K, i.e., hydrogen acts as an ignition inhibitor. At low temperatures, even ternary mixtures with a very high hydrogen concentration show multistage ignition, with the temperature dependence of the ignition delay time exhibiting a negative temperature coefficient region. Conversely, the addition of hydrogen to homogeneous and heterogeneous hydrocarbon-air mixtures at temperatures above 1050 K reduces the total ignition delay time, i.e., hydrogen acts as an autoignition promoter. These effects should be kept in mind when discussing the prospects for the practical use of hydrogen-containing fuel mixtures, as well as in solving the problems of fire and explosion safety.
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Original Russian Text © S.M. Frolov, S.N. Medvedev, V.Ya. Basevich, F.S. Frolov, 2013, published in Khimicheskaya Fizika, 2013, Vol. 32, No. 8, pp. 43–48.
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Frolov, S.M., Medvedev, S.N., Basevich, V.Y. et al. Autoignition and combustion of hydrocarbon-hydrogen-air homogeneous and heterogeneous ternary mixtures. Russ. J. Phys. Chem. B 7, 457–462 (2013). https://doi.org/10.1134/S1990793113040143
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DOI: https://doi.org/10.1134/S1990793113040143