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Numerical study on double injection techniques in a gasoline and biodiesel fueled RCCI (reactivity controlled compression ignition) engine

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  • Li, Jing
  • Ling, Xiang
  • Liu, Deng
  • Yang, Wenming
  • Zhou, Dezhi

Abstract

In an RCCI (reactivity controlled compression ignition) engine, the double injection strategy is a technical tool to control its combustion process. In this study, the effects of two key injection parameters, namely dwell and split fraction, are numerically investigated in a gasoline and biodiesel fueled RCCI engine. In the engine, gasoline is used as the premixed fuel; meanwhile, biodiesel is directly injected into the air-fuel mixture. The coupled KIVA4-CHEMKIN code was used to simulate the in-cylinder combustion process and the emissions formation. The gasoline/biodiesel reaction mechanism, which consists of 107 species and 425 reactions, was implemented in the code for detailed chemistry calculation. During the simulation, the dwells between 1st and 2nd SOI (start of injection) timings were varied at 5, 15, 25 and 35°CA, while the 1st SOI timing was fixed at −35 °C ATDC. Besides, the 1st pulse fractions were changed at 30%, 50% and 70%; accordingly, the rest of the biodiesel was injected through the 2nd pulse. The combustion characteristics (including in-cylinder pressure, HRR (heat release rate), ignition delay, PPRR (peak pressure rise rate) and combustion duration), engine performance and emissions (NO and soot) formations were compared under various operating conditions. The results show that double injection strategy results in longer ignition delay. In contrast with the dwells of 15° and 25°CA, the cases with dwells of 5° and 35°CA could result in acceptable PPRR, longer combustion duration, but slightly lower IMEP (indicated mean effective pressure). However, short dwell of 5°CA displays better results on NO and soot emissions. The combustion process with long dwell of 35°CA is both reactivity and mixing controlled.

Suggested Citation

  • Li, Jing & Ling, Xiang & Liu, Deng & Yang, Wenming & Zhou, Dezhi, 2018. "Numerical study on double injection techniques in a gasoline and biodiesel fueled RCCI (reactivity controlled compression ignition) engine," Applied Energy, Elsevier, vol. 211(C), pages 382-392.
    • Handle: RePEc:eee:appene:v:211:y:2018:i:c:p:382-392
    DOI: 10.1016/j.apenergy.2017.11.062
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    2. Jin, Tai & Wu, Yunchao & Wang, Xujiang & Luo, Kai H. & Lu, Tianfeng & Luo, Kun & Fan, Jianren, 2019. "Ignition dynamics of DME/methane-air reactive mixing layer under reactivity controlled compression ignition conditions: Effects of cool flames," Applied Energy, Elsevier, vol. 249(C), pages 343-354.
    3. Li, Jing & Yu, Xiao & Xie, Jingcheng & Yang, Wenming, 2020. "Mitigation of high pressure rise rate by varying IVC timing and EGR rate in an RCCI engine with high premixed fuel ratio," Energy, Elsevier, vol. 192(C).
    4. Wenming, Yang & Meng, Yang, 2019. "Phi-T map analysis on RCCI engine fueled by methanol and biodiesel," Energy, Elsevier, vol. 187(C).
    5. 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).
    6. Ayat Gharehghani & Alireza Kakoee & Amin Mahmoudzadeh Andwari & Thanos Megaritis & Apostolos Pesyridis, 2021. "Numerical Investigation of an RCCI Engine Fueled with Natural Gas/Dimethyl-Ether in Various Injection Strategies," Energies, MDPI, vol. 14(6), pages 1-25, March.

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