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Effects of different injection strategies on ignition and combustion characteristics in an optical PPC engine

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  • Zhang, Miao
  • Derafshzan, Saeed
  • Richter, Mattias
  • Lundgren, Marcus

Abstract

Although multiple injection strategies have a significant influence on partially premixed combustion (PPC) efficiency, the mechanisms behind the influence are still to be explained and evaluated. In this paper, single, double, and triple injection strategies are used in a heavy-duty optical engine. The effects on engine efficiency are analyzed by an energy balance method. Furthermore, the change of ignition location and combustion process under different injection cases are explored by natural luminescence recorded by a high-speed camera. The results show that, with double injections, the interaction between the main and pilot jets advances the combustion phasing nearly to the top dead center (TDC), resulting in higher efficiency. This interaction also shifts the combustion process into the piston bowl, where it has high potential to reduce heat-transfer loss. With triple injections, the interaction between the main combustion (formed by the pilot and main injections) and the post injection jet significantly affects the combustion losses. In all, the jet-jet interaction and combustion-jet interactions play a significant role in engine efficiency when using multiple injections.

Suggested Citation

  • Zhang, Miao & Derafshzan, Saeed & Richter, Mattias & Lundgren, Marcus, 2020. "Effects of different injection strategies on ignition and combustion characteristics in an optical PPC engine," Energy, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s0360544220310082
    DOI: 10.1016/j.energy.2020.117901
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    References listed on IDEAS

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    Cited by:

    1. Rami Y. Dahham & Haiqiao Wei & Jiaying Pan, 2022. "Improving Thermal Efficiency of Internal Combustion Engines: Recent Progress and Remaining Challenges," Energies, MDPI, vol. 15(17), pages 1-60, August.
    2. Shirvani, Sasan & Shirvani, Saeid & Shamekhi, Amir H. & Reitz, Rolf & Salehi, Fatemeh, 2021. "Meeting EURO6 emission regulations by multi-objective optimization of the injection strategy of two direct injectors in a DDFS engine," Energy, Elsevier, vol. 229(C).

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