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Extending the lean operating range of a premixed charged compression ignition natural gas engine using a pre-chamber

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  • Esfahanian, Vahid
  • Salahi, Mohammad Mahdi
  • Gharehghani, Ayatallah
  • Mirsalim, Mostafa

Abstract

One major drawback about premixed charge compression ignition (PCCI) engines is incomplete combustion and producing high levels of carbon monoxide (CO) emission in lean operating conditions. This issue becomes even more serious when fuels with high octane number, e.g. natural gas, are used. In the present work, the combustion process of premixed charge natural gas engines is studied by means of numerical tools. The studied engine concepts are: conventional homogenous charge compression ignition (HCCI), HCCI with a pre-chamber and PCCI with a pre-chamber. The numerical model is validated against the experimental data and then, combustion characteristics and engine emissions in various operating regions, are discussed and compared. The results reveal that the PCCI case has the earliest start of combustion. It is also shown that in the ultra lean operating conditions (fuel equivalence ratio of 0.1) decreasing the intake temperature from 450 K results in an efficiency increment for the PCCI engine, while for the HCCI case this causes misfiring and more CO emission. Nevertheless, the PCCI engine has higher levels of NO emission compared to the HCCI cases and only in the ultra lean condition this level reaches amounts less than the acceptable limits set by Euro 6 emission regulations.

Suggested Citation

  • Esfahanian, Vahid & Salahi, Mohammad Mahdi & Gharehghani, Ayatallah & Mirsalim, Mostafa, 2017. "Extending the lean operating range of a premixed charged compression ignition natural gas engine using a pre-chamber," Energy, Elsevier, vol. 119(C), pages 1181-1194.
    • Handle: RePEc:eee:energy:v:119:y:2017:i:c:p:1181-1194
    DOI: 10.1016/j.energy.2016.11.071
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    1. Bedoya, Iván D. & Saxena, Samveg & Cadavid, Francisco J. & Dibble, Robert W. & Wissink, Martin, 2012. "Experimental evaluation of strategies to increase the operating range of a biogas-fueled HCCI engine for power generation," Applied Energy, Elsevier, vol. 97(C), pages 618-629.
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    5. Gharehghani, Ayatallah & Hosseini, Reza & Mirsalim, Mostafa & Jazayeri, S. Ali & Yusaf, Talal, 2015. "An experimental study on reactivity controlled compression ignition engine fueled with biodiesel/natural gas," Energy, Elsevier, vol. 89(C), pages 558-567.
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    1. Fan, Baowei & Pan, Jianfeng & Yang, Wenming & Pan, Zhenhua & Bani, Stephen & Chen, Wei & He, Ren, 2017. "Combined effect of injection timing and injection angle on mixture formation and combustion process in a direct injection (DI) natural gas rotary engine," Energy, Elsevier, vol. 128(C), pages 519-530.
    2. Qian, Yong & Wu, Zhiyong & Guo, Jinjing & Li, Zilong & Jiang, Chenxu & Lu, Xingcai, 2019. "Experimental studies on the key parameters controlling the combustion and emission in premixed charge compression ignition concept based on diesel surrogates," Applied Energy, Elsevier, vol. 235(C), pages 233-246.
    3. Gharehghani, Ayat & Salahi, Mohammad Mahdi & Andwari, Amin Mahmoudzadeh & Mikulski, Maciej & Könnö, Juho, 2023. "Reactivity enhancement of natural gas/diesel RCCI engine by adding ozone species," Energy, Elsevier, vol. 274(C).
    4. Moradi, Jamshid & Gharehghani, Ayat & Mirsalim, Mostafa, 2020. "Numerical investigation on the effect of oxygen in combustion characteristics and to extend low load operating range of a natural-gas HCCI engine," Applied Energy, Elsevier, vol. 276(C).

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