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Effect of Injection Strategies in Diesel/NG Direct-Injection Engines on the Combustion Process and Emissions under Low-Load Operating Conditions

Author

Listed:
  • Jinze Li

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

  • Longfei Deng

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

  • Jianjun Guo

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

  • Min Zhang

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

  • Zhenyuan Zi

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

  • Jie Zhang

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

  • Binyang Wu

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

Abstract

The direct injection of natural gas (NG), which is an important research direction in the development of NG engines, has the potential to improve thermal efficiency and emissions. When NG engines operate in low-load conditions, combustion efficiency decreases and hydrocarbon (HC) emissions increase due to lean fuel mixtures and slow flame propagation speeds. The effect of two combustion modes (partially premixed compression ignition (PPCI) and high pressure direct injection (HPDI)) on combustion processes was investigated by CFD (Computational Fluid Dynamics), with a focus on different injection strategies. In the PPCI combustion mode, NG was injected early in the compression stroke and premixed with air, and then the pilot diesel was injected to cause ignition near the top dead center. This combustion mode produced a faster heat release rate, but the HC emissions were higher, and the combustion efficiency was lower. In the HPDI combustion mode, the diesel was injected first and ignited, and then the NG was injected into the flame. This combustion mode resulted in higher emissions of NO x and soot, with a diffusion combustion in the cylinder. HC emissions significantly decreased. Compared with PPCI combustion, HPDI had a higher thermal efficiency.

Suggested Citation

  • Jinze Li & Longfei Deng & Jianjun Guo & Min Zhang & Zhenyuan Zi & Jie Zhang & Binyang Wu, 2020. "Effect of Injection Strategies in Diesel/NG Direct-Injection Engines on the Combustion Process and Emissions under Low-Load Operating Conditions," Energies, MDPI, vol. 13(4), pages 1-18, February.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:4:p:990-:d:324015
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    References listed on IDEAS

    as
    1. Jingrui Li & Jietuo Wang & Teng Liu & Jingjin Dong & Bo Liu & Chaohui Wu & Ying Ye & Hu Wang & Haifeng Liu, 2019. "An Investigation of the Influence of Gas Injection Rate Shape on High-Pressure Direct-Injection Natural Gas Marine Engines," Energies, MDPI, vol. 12(13), pages 1-18, July.
    2. Girma T. Chala & Abd Rashid Abd Aziz & Ftwi Y. Hagos, 2018. "Natural Gas Engine Technologies: Challenges and Energy Sustainability Issue," Energies, MDPI, vol. 11(11), pages 1-44, October.
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    Cited by:

    1. Yang, Kailin & Wang, Zhongshu & Zhang, Kechao & Wang, Dan & Xie, Fangxi & Xu, Yun & Yang, Kaiqiang, 2023. "Impact of natural gas injection timing on the combustion and emissions performance of a dual-direct-injection diesel/natural gas engine," Energy, Elsevier, vol. 270(C).

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