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Impact of Pilot Injection on Combustion and Emission Characteristics of a Low-Speed Two-Stroke Marine Diesel Engine

Author

Listed:
  • Xingyu Liang

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Ziyang Liu

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Kun Wang

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Xiaohui Wang

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Zhijie Zhu

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Chaoyang Xu

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Bo Liu

    (China Shipbuilding Power Engineering Institute, Shanghai 201306, China)

Abstract

Low-speed two-stroke marine diesel engines dominate the modern global long-distance transportation market; with the increasingly stringent regulations, the combustion and emissions of these engines is gaining intense interest. The primary objective of the present study was to understand the effects of air-fuel mixing by pilot injection strategy on the combustion and emission characteristics of the marine diesel engines through a numerical study. Specifically, a computational fluid dynamic (CFD) model was established and validated by experimental data for a typical low-speed two-stroke marine diesel engine. The combustion parameters under different stages were analyzed, including mean in-cylinder temperature and pressure, indicated thermal efficiency (ITE), indicated specific fuel consumption (ISFC), and distribution of fuel-air mixture. Results indicated that, due to the premixing effect, the pilot injection produced unburned soot from the main injection’s ignition as well as decrease the intervals between the middle and final stages of combustion, thus raising the in-cylinder temperature. The interaction between the reduction of soot particles resulted from the increased temperature, and the decrease of the stage intervals led to lower overall boundary heat loss, which improved the effective thermal efficiency. The pilot injection timing and quality, respectively, showed quadratic and linear impact modes on engine performance and emissions.

Suggested Citation

  • Xingyu Liang & Ziyang Liu & Kun Wang & Xiaohui Wang & Zhijie Zhu & Chaoyang Xu & Bo Liu, 2021. "Impact of Pilot Injection on Combustion and Emission Characteristics of a Low-Speed Two-Stroke Marine Diesel Engine," Energies, MDPI, vol. 14(2), pages 1-20, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:2:p:417-:d:479811
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    References listed on IDEAS

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    1. Simón Martínez-Martínez & Oscar A. de la Garza & Miguel García-Yera & Ricardo Martínez-Carrillo & Fausto A. Sánchez-Cruz, 2021. "Hydraulic Interactions between Injection Events Using Multiple Injection Strategies and a Solenoid Diesel Injector," Energies, MDPI, vol. 14(11), pages 1-11, May.

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