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An experimental study of the hydraulic free piston engine

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Listed:
  • Zhao, Zhenfeng
  • Zhang, Fujun
  • Huang, Ying
  • Zhao, Changlu
  • Guo, Feng

Abstract

A prototype of hydraulic free piston engine has been developed to achieve efficient energy conversion directly from chemical energy of fuel to hydraulic energy. In stable running condition, in order to verify the features of this kind of engine, the piston dynamics, combustion process and hydraulic characteristics are investigated through series of tests of the prototype. The experimental results show that the majority of fuel burns in the rapid combustion phase which is due to the high piston velocity in the final part of the compression stroke. The combustion is characterized by a constant volume process. Furthermore, the indicated thermal efficiency and the indicated mean effective pressure of the prototype presented in this study are 41% and 5.2bar respectively.

Suggested Citation

  • Zhao, Zhenfeng & Zhang, Fujun & Huang, Ying & Zhao, Changlu & Guo, Feng, 2012. "An experimental study of the hydraulic free piston engine," Applied Energy, Elsevier, vol. 99(C), pages 226-233.
    • Handle: RePEc:eee:appene:v:99:y:2012:i:c:p:226-233
    DOI: 10.1016/j.apenergy.2012.05.018
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    References listed on IDEAS

    as
    1. Mikalsen, R. & Jones, E. & Roskilly, A.P., 2010. "Predictive piston motion control in a free-piston internal combustion engine," Applied Energy, Elsevier, vol. 87(5), pages 1722-1728, May.
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    4. Mikalsen, R. & Roskilly, A.P., 2010. "The control of a free-piston engine generator. Part 2: Engine dynamics and piston motion control," Applied Energy, Elsevier, vol. 87(4), pages 1281-1287, April.
    5. Xu, Zhaoping & Chang, Siqin, 2010. "Prototype testing and analysis of a novel internal combustion linear generator integrated power system," Applied Energy, Elsevier, vol. 87(4), pages 1342-1348, April.
    Full references (including those not matched with items on IDEAS)

    Citations

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    Cited by:

    1. Zhang, Chen & Sun, Zongxuan, 2016. "Using variable piston trajectory to reduce engine-out emissions," Applied Energy, Elsevier, vol. 170(C), pages 403-414.
    2. Wang, Yaodong & Chen, Lin & Jia, Boru & Roskilly, Anthony Paul, 2017. "Experimental study of the operation characteristics of an air-driven free-piston linear expander," Applied Energy, Elsevier, vol. 195(C), pages 93-99.
    3. Zhao, Zhenfeng & Wang, Shan & Zhang, Shuanlu & Zhang, Fujun, 2016. "Thermodynamic and energy saving benefits of hydraulic free-piston engines," Energy, Elsevier, vol. 102(C), pages 650-659.
    4. 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.
    5. Zhu, Yongsheng & Wang, Yang & Zhen, Xudong & Guan, Shuai & Wang, Jiancai & Wu, Yining & Chen, Yujin & Yin, Shujun, 2014. "The control of an opposed hydraulic free piston engine," Applied Energy, Elsevier, vol. 126(C), pages 213-220.
    6. Zhang, Shuanlu & Zhao, Changlu & Zhao, Zhenfeng & Ma, Fukang, 2015. "Combustion characteristics analysis of hydraulic free piston diesel engine," Applied Energy, Elsevier, vol. 160(C), pages 761-768.
    7. Zhang, Shuanlu & Zhao, Changlu & Zhao, Zhenfeng, 2015. "Stability analysis of hydraulic free piston engine," Applied Energy, Elsevier, vol. 157(C), pages 805-813.
    8. Alagumalai, Avinash, 2014. "Internal combustion engines: Progress and prospects," Renewable and Sustainable Energy Reviews, Elsevier, vol. 38(C), pages 561-571.
    9. Boru Jia & Andrew Smallbone & Rikard Mikalsen & K.V. Shivaprasad & Sumit Roy & Anthony Paul Roskilly, 2019. "Performance Analysis of a Flexi-Fuel Turbine-Combined Free-Piston Engine Generator," Energies, MDPI, vol. 12(14), pages 1-22, July.
    10. 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.
    11. 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.
    12. 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.
    13. Jia, Boru & Tian, Guohong & Feng, Huihua & Zuo, Zhengxing & Roskilly, A.P., 2015. "An experimental investigation into the starting process of free-piston engine generator," Applied Energy, Elsevier, vol. 157(C), pages 798-804.
    14. 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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