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Analysis of the mechanisms of ignition and combustion of i-C8H18–H2 and n-C10H22–H2 fuel blends in air

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Combustion, Explosion, and Shock Waves Aims and scope

Abstract

The processes of ignition and combustion of i-C8H18–H2 and n-C10H22–H2 fuel blends in air are analyzed numerically. It is demonstrated that addition of hydrogen both to normal alkane (n-C10H22) and to alkane with a branched structure (i-C8H18) leads to an increase in the ignition delay time τind if the initial temperature of the mixture T 0 is lower than a certain value T l and, vice versa, to a decrease in τind at T 0 > T l. The greater the fraction of hydrogen in the mixture, the greater the change in τind. At sufficiently high temperatures (T 0 > T h), addition of a small amount of alkane (≈2–10%) to hydrogen reduces the ignition delay time. The value of Tl depends on the pressure of the fuel–air mixture and, to a smaller extent, on the n-alkane type. The value of T h also depends on the fraction of alkane in the fuel blend. If the initial pressure is sufficiently high (10 atm and more), addition of a small amount of i-C8H18 or n-C10H22 to the hydrogen–air mixture reduces the value of τind for all values of T 0. These features are caused by intense interaction of alkane and hydrogen oxidation kinetics. It is demonstrated that fuel blends consisting of hydrogen and n-C10H22 (i-C8H18) have a higher velocity of the laminar flame and wider limits of stable combustion than the hydrocarbons themselves. Nevertheless, a noticeable increase in the laminar flame velocity is observed only for the molar fraction of hydrogen in the fuel blend greater than 50%. In this case, it becomes possible to ensure stable combustion with a smaller fraction of NO in combustion products.

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Authors and Affiliations

  1. Baranov Central Institute of Aviation Motors, Scientific-Educational Center “Physicochemical kinetics and combustion,”, Moscow, 111116, Russia

    N. S. Titova, S. A. Torokhov, O. N. Favorskii & A. M. Starik

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  1. N. S. Titova
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  2. S. A. Torokhov
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  3. O. N. Favorskii
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  4. A. M. Starik
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Correspondence to N. S. Titova.

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Published in Fizika Goreniya i Vzryva, Vol. 52, No. 6, pp. 13–25, November–December, 2016.

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Titova, N.S., Torokhov, S.A., Favorskii, O.N. et al. Analysis of the mechanisms of ignition and combustion of i-C8H18–H2 and n-C10H22–H2 fuel blends in air. Combust Explos Shock Waves 52, 631–642 (2016). https://doi.org/10.1134/S0010508216060022

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  • DOI: https://doi.org/10.1134/S0010508216060022

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