Experimental Determination of Self-Ignition Delay of Mixtures of Methane with Light Alkanes

Troshin, K. Ya.; Никитин, А. В.; Belyaev, A. A.; Arutyunov, A. V.; Kiryushin, A. A.; Arutyunov, V. S.

doi:10.1134/s0010508219050022

Cited by 6 publications

(9 citation statements)

References 10 publications

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“…These temperature regions are separated by a sharply different dependence for T0 = 900 K, in which the activation energy of the autoignition delay time of methane-hydrogen mixtures monotonically increases with the hydrogen concentration in the mixture from 30.5 kcal/mol for methane to 117.7 kcal/mol for hydrogen, which is almost fourfold (Figure 7). The experimental results we obtained for T0 = 900 K (Figure 7), taking into account various factors that can introduce errors [28,29], are in good agreement with the simulation results. When hydrogen concentration in the mixture is changed from zero to 50%, the experimentally determined activation energy of the autoignition delay time of methane-hydrogen mixtures increased monotonically from 23.4 kcal/mol to 73.7 kcal/mol.…”

Section: Influence Of Temperature and Hydrogen Concentrationsupporting

confidence: 84%

“…Processes 2022, 10, 2177 5 of 22 change in the mechanism of autoignition in this temperature range. This effect of hydrogen addition on the autoignition of methane distinguishes it sharply from that addition of C 2 -C 6 alkanes on it, for which, regardless of the added alkane concentration, the effective activation energy for the autoignition delay time remain practically unchanged, within 40 ± 10 kcal/mol [28][29][30].…”

Section: Experimental Investigation Of the Autoignition Delay Time Of...mentioning

confidence: 90%

“…Such a significant change in the effective activation energy of the autoignition delay time is indicative of a serious change in the mechanism of autoignition in this temperature range. This effect of hydrogen addition on the autoignition of methane distinguishes it sharply from that addition of C2-C6 alkanes on it, for which, regardless of the added alkane concentration, the effective activation energy for the autoignition delay time remain practically unchanged, within 40 ± 10 kcal/mol [28][29][30]. A consequence of the autoignition delay time activation energy for methane-hydrogen mixtures increasing with the hydrogen concentration is an enhancement in their sensitivity to temperature changes and, consequently, a decrease in their detonation resistance, since not only is the value of the ignition delay itself important, but also the sensitivity of the fuel to changes in temperature, concentration, and pressure.…”

Section: Experimental Investigation Of the Autoignition Delay Time Of...mentioning

confidence: 92%

“…In this study, an experimental investigation of the autoignition delay time of methane-hydrogen mixtures was carried out in a static-type setup with a closed reaction vessel by the high-pressure bomb method described in detail in [28,29]. The reactor was a thick-walled heated cylindrical vessel made of stainless-steel, with a diameter and height of 10 cm.…”

Section: Experimental Investigation Of the Autoignition Delay Time Of...mentioning

confidence: 99%

“…The autoignition delay time was defined as the time from the moment of pressure equalization after mixture admission into the reactor to the moment of a sharp pressure rise as a result of its autoignition. Typical pressure change curves are presented in [28,29]. The autoignition delay time that can be measured by this method is limited from below by the time of mixture inlet in the reactor and equalizing of its temperature, which is ~0.2 s, and from above by a period of about 20 s, exceeding which can lead to an uncontrolled change in the composition of the mixture and the state of the reactor surface.…”

Section: Experimental Investigation Of the Autoignition Delay Time Of...mentioning

confidence: 99%

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Autoignition of Methane–Hydrogen Mixtures below 1000 K

et al. 2022

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In the range of 800–1200 K, both experiments and kinetic modeling demonstrate a significant difference in the dependence of the ignition delay time of methane and hydrogen on pressure and temperature, with the complex influence of these parameters on the autoignition delay time of methane–hydrogen–air mixtures. In connection with the prospects for the widespread use of methane–hydrogen mixtures in energy production and transport, a detailed analysis of their ignition at temperatures below 1000 K, the most important region from the point of view of their practical application, is carried out. It is shown that such a complex behavior is associated with the transition in this temperature range from low-temperature mechanisms of oxidation of both methane and hydrogen, in which peroxide radicals and molecules play a decisive role, to high-temperature mechanisms of their oxidation, in which simpler radicals dominate. A kinetic interpretation of the processes occurring in this case is proposed.

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Section: Influence Of Temperature and Hydrogen Concentrationsupporting

confidence: 84%

Section: Experimental Investigation Of the Autoignition Delay Time Of...mentioning

confidence: 90%