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Mathematical modelling of a hydraulic free-piston engine considering hydraulic valve dynamics

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

Abstract

This paper describes the design of a single piston compression ignition hydraulic free-piston engine. An engine simulation model considering hydraulic valve dynamics is built. Extensive simulated results are presented and the major features of the engine are discussed. Experimental results from a full-cycle test of a prototype are also included and analysed integrated with simulation as well. The good agreement between experiments and simulations confirms the model can predict the engine performance. The engine takes more time in the suck phase for one cycle, which is helpful in sucking the low-pressure oil into the pump chamber. The dynamics of valves on the hydraulic chambers affect the chamber pressures. The pump chamber valve response lag compared with the piston displacement affects not only the chamber volumetric efficiency but also the engine fuel economy. The unchangeable piston motion trajectory makes the engine possible to get a high volumetric efficiency with fixed check valves. The rebound changes the compression stroke length and should be considered in the engine control. Asymmetric strokes appear when the engine is running under the piston self-excited vibration frequency.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:36:y:2011:i:10:p:6234-6242
    DOI: 10.1016/j.energy.2011.07.039
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    References listed on IDEAS

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    1. Dhuchakallaya, I. & Watkins, A.P., 2010. "Application of spray combustion simulation in DI diesel engine," Applied Energy, Elsevier, vol. 87(4), pages 1427-1432, April.
    2. Gogoi, T.K. & Baruah, D.C., 2010. "A cycle simulation model for predicting the performance of a diesel engine fuelled by diesel and biodiesel blends," Energy, Elsevier, vol. 35(3), pages 1317-1323.
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    Cited by:

    1. Wu, Limin & Feng, Huihua & Jia, Boru & Tang, Zhifeng & Yan, Xiaodong & Wang, Wei, 2022. "A novel method to investigate the power generation characteristics of linear generator in full frequency operation range applied to opposed-piston free-piston engine generator _ Simulation and test re," Energy, Elsevier, vol. 254(PB).
    2. 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.
    3. Yuan, Chenheng & Feng, Huihua & He, Yituan & Xu, Jing, 2016. "Combustion characteristics analysis of a free-piston engine generator coupling with dynamic and scavenging," Energy, Elsevier, vol. 102(C), pages 637-649.
    4. 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.
    5. Jia, Boru & Zuo, Zhengxing & Feng, Huihua & Tian, Guohong & Smallbone, Andrew & Roskilly, A.P., 2016. "Effect of closed-loop controlled resonance based mechanism to start free piston engine generator: Simulation and test results," Applied Energy, Elsevier, vol. 164(C), pages 532-539.
    6. Wu, Yining & Wang, Yang & Zhen, Xudong & Guan, Shuai & Wang, Jiancai, 2014. "Three-dimensional CFD (computational fluid dynamics) analysis of scavenging process in a two-stroke free-piston engine," Energy, Elsevier, vol. 68(C), pages 167-173.
    7. 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.
    8. 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.
    9. 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.
    10. 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.
    11. 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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