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Effect of the diesel injection strategy on the combustion and emissions of propane/diesel dual fuel premixed charge compression ignition engines

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  • Lee, Jeongwoo
  • Chu, Sanghyun
  • Cha, Jaehyuk
  • Choi, Hoimyung
  • Min, Kyoungdoug

Abstract

In this research, the effects of the propane ratio and diesel direct injection strategy on the emissions and combustion characteristics of a propane-diesel dual fuel PCCI (premixed charge compression ignition) engine were evaluated. Under low speed and low engine load, the propane ratio was varied from 30 to 70% to investigate the effect of the LHV (low heating value) fuel content in the supplied fuel (propane and diesel mixture). The EGR rate was adjusted to suit each propane ratio to ensure combustibility and restricted emissions. Early diesel injection strategies have an excellent effect on the dual fuel combustion in terms of simultaneously reducing NOx (nitrogen oxides) and PM (particulate matter) emissions. This concept is based on PCCI combustion, in which the ignition delay is longer than the diesel injection. Meanwhile, although early single diesel injection has been an effective strategy for reducing NOx and PM emissions simultaneously, it was possible to further reduce NOx emissions using an early split injection strategy with a 30% propane ratio. Additionally, when the propane ratio was 70%, the ignitibility deteriorated due to early single diesel injection, which led to a much leaner air–fuel mixture condition locally prior to auto-ignition, causing unstable combustion. As a result, a multiple injection strategy with earlier main injection and a small diesel post-injection as a triggering source was adopted to stabilize dual fuel PCCI combustion with a high propane ratio. The results emphasized that the diesel injection strategy could be adjusted to suit various propane ratios under dual fuel PCCI combustion to reduce NOx and PM emissions while maintaining thermal efficiency.

Suggested Citation

  • Lee, Jeongwoo & Chu, Sanghyun & Cha, Jaehyuk & Choi, Hoimyung & Min, Kyoungdoug, 2015. "Effect of the diesel injection strategy on the combustion and emissions of propane/diesel dual fuel premixed charge compression ignition engines," Energy, Elsevier, vol. 93(P1), pages 1041-1052.
    • Handle: RePEc:eee:energy:v:93:y:2015:i:p1:p:1041-1052
    DOI: 10.1016/j.energy.2015.09.032
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    Citations

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    Cited by:

    1. Lee, Jeongwoo & Chu, Sanghyun & Lim, Donghyun & Jung, Hyunsung & Chi, Yohan & Min, Kyoungdoug, 2022. "Comparison of combustion and emission characteristics under single-fueled and dual-fueled conditions with premixed compression ignition," Energy, Elsevier, vol. 241(C).
    2. Pachiannan, Tamilselvan & Zhong, Wenjun & Rajkumar, Sundararajan & He, Zhixia & Leng, Xianying & Wang, Qian, 2019. "A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    3. Zhaojie Shen & Wenzheng Cui & Xiaodong Ju & Zhongchang Liu & Shaohua Wu & Jianguo Yang, 2018. "Numerical Investigation on Effects of Assigned EGR Stratification on a Heavy Duty Diesel Engine with Two-Stage Fuel Injection," Energies, MDPI, vol. 11(3), pages 1-14, February.
    4. Wu, Horng-Wen & Fan, Chen-Ming & He, Jian-Yi & Hsu, Tzu-Ting, 2017. "Optimal factors estimation for diesel/methanol engines changing methanol injection timing and inlet air temperature," Energy, Elsevier, vol. 141(C), pages 1819-1828.
    5. Xiao, Gang & Jia, Ming & Wang, Tianyou, 2016. "Large eddy simulation of n-heptane spray combustion in partially premixed combustion regime with linear eddy model," Energy, Elsevier, vol. 97(C), pages 20-35.
    6. Akbari, Shahin & Tashakori, Saeed & Ranjbar, Ali Mohammad & Jahanshahi, Javad Afshar & Sadeghi, Sadegh & Bidabadi, Mehdi & Xu, Fei, 2021. "Analytical modeling of lycopodium-propane dual-fuel combustion system in premixed mode in counter-flow configuration," Renewable Energy, Elsevier, vol. 165(P1), pages 783-798.

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