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Fuel combustion under asymmetric piston motion: Tested results

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  • Hu, Jibin
  • Wu, Wei
  • Yuan, Shihua
  • Jing, Chongbo

Abstract

This paper presents the measured characteristics of a single piston hydraulic free-piston engine prototype. The detailed results about the piston motion and the fuel combustion are presented. The results show that there is a strong interaction between the piston motion and the fuel combustion in the free-piston engine. The gas force plays a leading role in the innate asymmetric piston motion around top dead centre. The small moving piston inertia makes the asymmetric characteristics more visible. The combustion energy conversion of the single piston hydraulic free-piston engine is fast. Most of the fuel injected burns in 1.0 ms in the pre-mixed combustion phase. Because of the asymmetric characteristics, the mixing-controlled combustion phase in the single piston hydraulic free-piston engine is much shorter than the one in the conventional diesel engine. The short combustion duration decreases the rated power of the free-piston engine. The asymmetric piston motion is unfavourable for the rated power increase of the free-piston engine. The smaller rated power has a negative effect on the free-piston engine application development.

Suggested Citation

  • Hu, Jibin & Wu, Wei & Yuan, Shihua & Jing, Chongbo, 2013. "Fuel combustion under asymmetric piston motion: Tested results," Energy, Elsevier, vol. 55(C), pages 209-215.
    • Handle: RePEc:eee:energy:v:55:y:2013:i:c:p:209-215
    DOI: 10.1016/j.energy.2013.04.013
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    References listed on IDEAS

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    5. Hu, Jibin & Wu, Wei & Yuan, Shihua & Jing, Chongbo, 2011. "Mathematical modelling of a hydraulic free-piston engine considering hydraulic valve dynamics," Energy, Elsevier, vol. 36(10), pages 6234-6242.
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    Cited by:

    1. Wu, Wei & Hu, Jibin & Yuan, Shihua, 2014. "Semi-analytical modelling of a hydraulic free-piston engine," Applied Energy, Elsevier, vol. 120(C), pages 75-84.
    2. Zhang, Shuanlu & Zhao, Zhenfeng & Zhao, Changlu & Zhang, Fujun & Wang, Shan, 2017. "Cold starting characteristics analysis of hydraulic free piston engine," Energy, Elsevier, vol. 119(C), pages 879-886.
    3. Fukang Ma & Shuanlu Zhang & Zhenfeng Zhao & Yifang Wang, 2021. "Research on the Operating Characteristics of Hydraulic Free-Piston Engines: A Systematic Review and Meta-Analysis," Energies, MDPI, vol. 14(12), pages 1-23, June.
    4. Zhang, Shuanlu & Zhao, Zhenfeng & Zhao, Changlu & Zhang, Fujun & Wang, Shan, 2016. "Experimental study of hydraulic electronic unit injector in a hydraulic free piston engine," Applied Energy, Elsevier, vol. 179(C), pages 888-898.
    5. Zhao, Zhenfeng & Wu, Dan & Zhang, Zhenyu & Zhang, Fujun & Zhao, Changlu, 2014. "Experimental investigation of the cycle-to-cycle variations in combustion process of a hydraulic free-piston engine," Energy, Elsevier, vol. 78(C), pages 257-265.

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