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Experimental and CFD Investigation of Fuel Mixing in an Optical-Access Direct-Injection NG Engine and Correlation with Test Rig Combustion and Performance Data

Author

Listed:
  • Daniela Misul

    (Energy Department, Politecnico di Torino, 10129 Torino, Italy)

  • Mirko Baratta

    (Energy Department, Politecnico di Torino, 10129 Torino, Italy)

  • Jiajie Xu

    (Energy Department, Politecnico di Torino, 10129 Torino, Italy)

  • Alois Fuerhapter

    (AVL List GmbH, 8020 Graz, Austria)

  • Rene Heindl

    (AVL List GmbH, 8020 Graz, Austria)

Abstract

The present paper is the result of a cooperation between Politecnico di Torino and AVL List Gmbh within a recent collaborative research project funded by the EC. The research work was focused on the experimental and numerical characterization of mixture formation, combustion, and emissions in direct-injection NG engines, to draw useful indication for the design of innovative, high-performance engine concepts. As a matter of fact, direct-injection IC engines running on NG are believed to be a competitive transition solution towards a sustainable mobility scenario, given their maturity, technological readiness, and flexibility with respect to the fuel quality. Moreover, gaseous-fuel engines can further decrease their carbon footprint if blending of natural gas with hydrogen is considered. Provided that mixture formation represents a key aspect for the design of direct-injection engines, the activity presented in this paper is focused on the characterization of NG injection and on the mixing process, as well as the impact these latter hold on the combustion process as well as on engine-out emissions. The mixture formation process was analyzed by means of combined CFD and optical investigations. Furthermore, a full version of the engine was tested on a dynamic test rig, providing quantitative information on the engine performance and emission characteristics. The CFD results highlighted the correlation between the mixture homogeneity and the combustion stability and hinted at a relevant impact of the jet characteristics on the air charge tumble and turbulence characteristics.

Suggested Citation

  • Daniela Misul & Mirko Baratta & Jiajie Xu & Alois Fuerhapter & Rene Heindl, 2023. "Experimental and CFD Investigation of Fuel Mixing in an Optical-Access Direct-Injection NG Engine and Correlation with Test Rig Combustion and Performance Data," Energies, MDPI, vol. 16(7), pages 1-19, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3004-:d:1107098
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    References listed on IDEAS

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    1. Zhang, Zhijin & Zhang, Haiyan & Wang, Tianyou & Jia, Ming, 2014. "Effects of tumble combined with EGR (exhaust gas recirculation) on the combustion and emissions in a spark ignition engine at part loads," Energy, Elsevier, vol. 65(C), pages 18-24.
    2. Iren A. Makaryan & Igor V. Sedov & Eugene A. Salgansky & Artem V. Arutyunov & Vladimir S. Arutyunov, 2022. "A Comprehensive Review on the Prospects of Using Hydrogen–Methane Blends: Challenges and Opportunities," Energies, MDPI, vol. 15(6), pages 1-27, March.
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    Cited by:

    1. Daniela A. Misul & Alex Scopelliti & Mirko Baratta, 2024. "High-Performance Hydrogen-Fueled Internal Combustion Engines: Feasibility Study and Optimization via 1D-CFD Modeling," Energies, MDPI, vol. 17(7), pages 1-20, March.
    2. Ravi Velugula & Balasubramanian Thiruvallur loganathan & Lakshminarasimhan Varadhaiyengar & Ramesh Asvathanarayanan & Mayank Mittal, 2023. "An Analysis of Mechanical and Thermal Stresses, Temperature and Displacement within the Transparent Cylinder and Piston Top of a Small Direct-Injection Spark-Ignition Optical Engine," Energies, MDPI, vol. 16(21), pages 1-25, November.

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