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Influence of In-Cylinder Turbulence Kinetic Energy on the Mixing Uniformity within Gaseous-Fuel Engines under Various Intake Pressure Conditions

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  • Tianbo Wang

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
    These authors contributed equally to this work.)

  • Yu Wang

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China
    These authors contributed equally to this work.)

  • Lanchun Zhang

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China)

  • Yan Zheng

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China)

  • Ranran Liu

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China)

  • Chengmin Wang

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China)

  • Wu Gong

    (Department of Automotive Transportation and Engineering, Jiangsu University of Technology, Changzhou 213001, China)

Abstract

To explore the potential for further enhancing the gas mixing uniformity of natural gas (NG) engines, this paper identifies turbulent kinetic energy (TKE), which has an essential impact on gas mixing, as the entry point of the research. After establishing a computational fluid dynamics (CFD) model for NG engines’ direct injection and mixing processes, the inlet pressure is selected as the experimental variable to investigate the influence of TKE on gas mixing uniformity. In particular, by proposing the theoretical concept of the core mixing stage, the numerical variation rule between the best mixture concentration region (BMCR) percentage and the mean turbulent kinetic energy (MTKE) of the core mixing stage is analyzed under certain injection timing conditions. The results indicate that, with identical intake pressures, an advanced gas injection timing elevates the total turbulence kinetic energy (TTKE) during the core mixing stage, thereby amplifying the uniformity of the gas mixture at the ignition. In specific scenarios, as the intake pressure increases, the decreasing trend in the BMCR proportion closely resembles the diminishing trend in the MTKE during the core mixing stage. Scrutinizing the variation trend in either parameter allows for an approximate prediction of the variation trend in the other parameter. When the intake pressure is gradually raised from the naturally aspirated state, the adequacy of the gas jet development is progressively reduced by the increasing back pressure in the cylinder.

Suggested Citation

  • Tianbo Wang & Yu Wang & Lanchun Zhang & Yan Zheng & Ranran Liu & Chengmin Wang & Wu Gong, 2024. "Influence of In-Cylinder Turbulence Kinetic Energy on the Mixing Uniformity within Gaseous-Fuel Engines under Various Intake Pressure Conditions," Energies, MDPI, vol. 17(13), pages 1-13, July.
  • Handle: RePEc:gam:jeners:v:17:y:2024:i:13:p:3321-:d:1430168
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    References listed on IDEAS

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    1. Keskinen, Karri & Kaario, Ossi & Nuutinen, Mika & Vuorinen, Ville & Künsch, Zaira & Liavåg, Lars Ola & Larmi, Martti, 2016. "Mixture formation in a direct injection gas engine: Numerical study on nozzle type, injection pressure and injection timing effects," Energy, Elsevier, vol. 94(C), pages 542-556.
    2. Tianbo Wang & Lanchun Zhang & Qian Chen, 2020. "Effect of Valve Opening Manner and Sealing Method on the Steady Injection Characteristic of Gas Fuel Injector," Energies, MDPI, vol. 13(6), pages 1-12, March.
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