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Effect of the HPDI and PPCI Combustion Modes of Direct-Injection Natural Gas Engine on Combustion and Emissions

Author

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  • Shouying Jin

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

  • Jinze Li

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

  • Longfei Deng

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

  • Binyang Wu

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

Abstract

Natural gas (NG) engines have very broad application prospects. The pilot-ignited NG diesel engine can be organized into two combustion modes according to the sequence of oil and gas injection: (1) High-pressure direct injection, where NG is mainly diffused combustion; and (2) partially premixed compression ignition, where NG is mainly premixed combustion. In this study, we used CONVERGE to explore the influence of the NG injection timing on the distribution of the mixture equivalence ratio, ignition characteristics, thermal efficiency, emission, and combustion reaction rate under the two combustion modes. We also used a multi-step soot model to analyze the particle mass and quantity. We showed herein that the NG injection timing significantly affects the mixture distribution in the cylinder, thereby consequently affecting the combustion process. Both very early and very late injection times were not conducive to NG combustion. In addition, the mass, quantity, and diameter of the soot produced by diffusion combustion were larger than those produced with premixed combustion.

Suggested Citation

  • Shouying Jin & Jinze Li & Longfei Deng & Binyang Wu, 2021. "Effect of the HPDI and PPCI Combustion Modes of Direct-Injection Natural Gas Engine on Combustion and Emissions," Energies, MDPI, vol. 14(7), pages 1-17, April.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:7:p:1957-:d:528821
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    References listed on IDEAS

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    2. Li, Menghan & Zhang, Qiang & Liu, Xiaori & Ma, Yuxian & Zheng, Qingping, 2018. "Soot emission prediction in pilot ignited direct injection natural gas engine based on n-heptane/toluene/methane/PAH mechanism," Energy, Elsevier, vol. 163(C), pages 660-681.
    3. Liu, Jie & Yang, Fuyuan & Wang, Hewu & Ouyang, Minggao & Hao, Shougang, 2013. "Effects of pilot fuel quantity on the emissions characteristics of a CNG/diesel dual fuel engine with optimized pilot injection timing," Applied Energy, Elsevier, vol. 110(C), pages 201-206.
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    1. Anmol Singh Kshatriya & Prabhatkumar Tiwari & Sreekanth M & T. M. Yunus Khan & Shaik Dawood Abdul Khadar & Mohamed Mansour & Feroskhan M, 2022. "Investigations into the Combined Effect of Mahua Biodiesel Blends and Biogas in a Dual Fuel Engine," Energies, MDPI, vol. 15(6), pages 1-15, March.

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