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Computational Analysis of Premixed Syngas/Air Combustion in Micro-channels: Impacts of Flow Rate and Fuel Composition

Author

Listed:
  • Sunita Pokharel

    (Center for Innovation in Gas Research and Utilization (CIGRU), Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506, USA)

  • Mohsen Ayoobi

    (Division of Engineering Technology, Wayne State University, Detroit, MI 48202, USA)

  • V’yacheslav Akkerman

    (Center for Innovation in Gas Research and Utilization (CIGRU), Department of Mechanical and Aerospace Engineering, West Virginia University, Morgantown, WV 26506, USA)

Abstract

Due to increasing demand for clean and green energy, a need exists for fuels with low emissions, such as synthetic gas (syngas), which exhibits excellent combustion properties and has demonstrated promise in low-emission energy production, especially at microscales. However, due to complicated flame properties in microscale systems, it is of utmost importance to describe syngas combustion and comprehend its properties with respect to its boundary and inlet conditions, and its geometric characteristics. The present work studied premixed syngas combustion in a two-dimensional channel, with a length of 20 mm and a half-width of 1 mm, using computational approaches. Specifically, a fixed temperature gradient was imposed at the upper wall, from 300 K at the inlet to 1500 K at the outlet, to preheat the mixture, accounting for the conjugate heat transfer through the walls. The detailed chemistry of the ignition process was imitated using the San Diego mechanism involving 46 species and 235 reactions. For the given boundary conditions, stoichiometric premixed syngas containing various compositions of carbon monoxide, methane, and hydrogen, over a range of inlet velocities, was simulated, and various combustion phenomena, such as ignition, flame stabilization, and flames with repeated extinction and ignition (FREI), were analyzed using different metrics. The flame stability and the ignition time were found to correlate with the inlet velocity for a given syngas mixture composition. Similarly, for a given inlet velocity, the correlation of the flame properties with respect to the syngas composition was further scrutinized.

Suggested Citation

  • Sunita Pokharel & Mohsen Ayoobi & V’yacheslav Akkerman, 2021. "Computational Analysis of Premixed Syngas/Air Combustion in Micro-channels: Impacts of Flow Rate and Fuel Composition," Energies, MDPI, vol. 14(14), pages 1-19, July.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:14:p:4190-:d:592394
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    References listed on IDEAS

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    1. D.F. Chuahy, Flavio & Kokjohn, Sage L., 2017. "High efficiency dual-fuel combustion through thermochemical recovery and diesel reforming," Applied Energy, Elsevier, vol. 195(C), pages 503-522.
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    3. Wang, Wei & Zuo, Zhengxing & Liu, Jinxiang, 2019. "Experimental study and numerical analysis of the scaling effect on the flame stabilization of propane/air mixture in the micro-scale porous combustor," Energy, Elsevier, vol. 174(C), pages 509-518.
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    Cited by:

    1. Bartosz Ciupek & Karol Gołoś & Radosław Jankowski & Zbigniew Nadolny, 2021. "Effect of Hard Coal Combustion in Water Steam Environment on Chemical Composition of Exhaust Gases," Energies, MDPI, vol. 14(20), pages 1-24, October.
    2. Mohsen Ayoobi & Pedro R. Resende & Alexandre M. Afonso, 2022. "Numerical Investigations of Combustion—An Overview," Energies, MDPI, vol. 15(9), pages 1-5, April.

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