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Numerical investigation the effects of the twin-spark plugs coupled with EGR on the combustion process and emissions characteristics in a lean burn natural gas SI engine

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  • Duan, Xiongbo
  • Zhang, Shiheng
  • Liu, Yiqun
  • Li, Yangtang
  • Liu, Jingping
  • Lai, Ming-Chia
  • Deng, Banglin

Abstract

In this study, the single-spark natural gas (NG) SI engine was simulated by using the CFD coupled with detailed combustion mechanism, and validated against with the experiment data. Additionally, the axisymmetrically twin-spark plugs were placed diametrically opposite to each other in the combustion head of the NG SI engine, and fired simultaneously during the simulation cases to trigger two independent spark kernels. The results indicated that twin-spark plugs yielded approximate combustion phasing and better fuel conversion efficiency. Interestingly, in the early stages of flame propagation triggered by the twin-spark plugs configuration, two independent spark kernels looked remarkably similar to the iconic of “Taiji” diagram of the Chinese Taoism, and two independent flame kernels were obviously moved along with the flow. The strong flow pushed the flame front close to the side of the intake port of the NG SI engine equipped with the single-spark plug. While two independent flame fronts of the NG SI engine equipped with the twin-spark plugs were located separately at the intake and exhaust ports in the combustion chamber. Furthermore, two independent flame fronts mutually collided with each other, and generated more independent combustion block areas in the center of the combustion chamber.

Suggested Citation

  • Duan, Xiongbo & Zhang, Shiheng & Liu, Yiqun & Li, Yangtang & Liu, Jingping & Lai, Ming-Chia & Deng, Banglin, 2020. "Numerical investigation the effects of the twin-spark plugs coupled with EGR on the combustion process and emissions characteristics in a lean burn natural gas SI engine," Energy, Elsevier, vol. 206(C).
    • Handle: RePEc:eee:energy:v:206:y:2020:i:c:s0360544220312883
    DOI: 10.1016/j.energy.2020.118181
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    2. Arun Teja Doppalapudi & Abul Kalam Azad & Mohammad Masud Kamal Khan, 2023. "Analysis of Improved In-Cylinder Combustion Characteristics with Chamber Modifications of the Diesel Engine," Energies, MDPI, vol. 16(6), pages 1-18, March.
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    4. Eckert, Jony Javorski & Silva, Fabrício L. & da Silva, Samuel Filgueira & Bueno, André Valente & de Oliveira, Mona Lisa Moura & Silva, Ludmila C.A., 2022. "Optimal design and power management control of hybrid biofuel–electric powertrain," Applied Energy, Elsevier, vol. 325(C).
    5. Shen, Zhaojie & Wang, Xinyan & Zhao, Hua & Lin, Bo & Shen, Yitao & Yang, Jianguo, 2021. "Numerical investigation of natural gas-diesel dual-fuel engine with different piston geometries and radial clearances," Energy, Elsevier, vol. 220(C).
    6. Yin, Xiaojun & Sun, Nannan & Sun, Ting & Shen, Hongguang & Mehra, Roopesh Kumar & Liu, Junlong & Wang, Ying & Yang, Bo & Zeng, Ke, 2022. "Experimental investigation the effects of spark discharge characteristics on the heavy-duty spark ignition natural gas engine at low load condition," Energy, Elsevier, vol. 239(PC).

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