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A diesel/natural gas dual fuel mechanism constructed to reveal combustion and emission characteristics

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  • Zhang, Wei
  • Chang, Shaoyue
  • Wu, Wei
  • Dong, Lihui
  • Chen, Zhaohui
  • Chen, Guisheng

Abstract

As natural gas is an ideal alternative fuel with low cost and clean combustion, this study constructs a mechanism of diesel/natural gas dual fuel, couples it with CFD, and then discusses the effects of natural gas replacement rates on engine combustion and emission under medium load conditions. The detailed mechanism of natural gas is simplified by two methods into a reduced mechanism, which are verified to prove that it can accurately predict ignition delay, laminar flame speed, temperature and pressure. The study also combines the reduced mechanism with the 95/5vv diesel mechanism to obtain a dual-fuel mechanism. This dual fuel mechanism is verified through chemical kinetics calculations, to predict the ignition delay, laminar flame speed, important free radicals and components. Furthermore, this mechanism is verified through coupling CFD, to predict that the combustion pressure and integrated heat release agreed with the experimental data. Results show that the dual-fuel mechanism displays its correctness, effectiveness and applicability. Calculations within the range of 0–60% natural gas replacement rates indicate a regular combustion sequence; at 40% replacement rate, NO emissions goes down by 6.8%, and soot emissions decrease by 92.9%. Yet when the replacement rate of natural gas is over 55%, combustion in cylinder deteriorates.

Suggested Citation

  • Zhang, Wei & Chang, Shaoyue & Wu, Wei & Dong, Lihui & Chen, Zhaohui & Chen, Guisheng, 2019. "A diesel/natural gas dual fuel mechanism constructed to reveal combustion and emission characteristics," Energy, Elsevier, vol. 179(C), pages 59-75.
    • Handle: RePEc:eee:energy:v:179:y:2019:i:c:p:59-75
    DOI: 10.1016/j.energy.2019.04.106
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    2. Ouyang, Tiancheng & Wang, Zhiping & Wang, Geng & Zhao, Zhongkai & Xie, Shutao & Li, Xiaoqing, 2021. "Advanced thermo-economic scheme and multi-objective optimization for exploiting the waste heat potentiality of marine natural gas engine," Energy, Elsevier, vol. 236(C).
    3. Ji, Shaobo & Li, Yang & Tian, Guohong & Shu, Minglei & Jia, Guorui & He, Shaoqing & Lan, Xin & Cheng, Yong, 2021. "Investigation of laminar combustion characteristics of ozonized methane-air mixture in a constant volume combustion bomb," Energy, Elsevier, vol. 226(C).
    4. Park, Hyunwook & Shim, Euijoon & Lee, Junsun & Oh, Seungmook & Kim, Changup & Lee, Yonggyu & Kang, Kernyong, 2023. "Comparative evaluation of conventional dual fuel, early pilot, and reactivity-controlled compression ignition modes in a natural gas-diesel dual-fuel engine," Energy, Elsevier, vol. 268(C).

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