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Combustion characteristics analysis of hydraulic free piston diesel engine

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  • Zhang, Shuanlu
  • Zhao, Changlu
  • Zhao, Zhenfeng
  • Ma, Fukang

Abstract

Compared with the conventional engine, the special characteristic of hydraulic free piston diesel engine decides its differences in the aspects of piston displacement, velocity, acceleration, etc. These differences lead to more complex fluid flow, and particular intrinsic energy distribution in-cylinder. Moreover, the mean velocity of the combustion gas is enhanced and the velocity of vortex in-cylinder is decided by the piston speed and the scavenging process. All these factors bring about the differences of heat transfer and air–fuel mixture. Fortunately all of them can be simulated and calculated by the CFD package. Therefore the rate of heat transfer in-cylinder can be obtained. Then the rate of heat release can be easily calculated. What is more, the calculated result is compared with the heat release regularity of Wiebe, and the fitted formula is used to analyze the heat release regularity of hydraulic free piston diesel engine. Further, polytropic exponent n is quoted to describe the condition of diffusion combustion. And then we analyze the working process of HFPDE based on the characteristics of the curves. Finally, the optimum proposals are presented.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:160:y:2015:i:c:p:761-768
    DOI: 10.1016/j.apenergy.2015.06.054
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    References listed on IDEAS

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    1. Kim, Jaeheun & Bae, Choongsik & Kim, Gangchul, 2013. "Simulation on the effect of the combustion parameters on the piston dynamics and engine performance using the Wiebe function in a free piston engine," Applied Energy, Elsevier, vol. 107(C), pages 446-455.
    2. Shehata, M.S., 2010. "Cylinder pressure, performance parameters, heat release, specific heats ratio and duration of combustion for spark ignition engine," Energy, Elsevier, vol. 35(12), pages 4710-4725.
    3. 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.
    4. 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.
    5. 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.
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    Cited by:

    1. Peng Sun & Chi Zhang & Jinhua Chen & Fei Zhao & Youyong Liao & Guilin Yang & Chinyin Chen, 2017. "Hybrid System Modeling and Full Cycle Operation Analysis of a Two-Stroke Free-Piston Linear Generator," Energies, MDPI, vol. 10(2), pages 1-23, February.
    2. Peng Sun & Chi Zhang & Jinhua Chen & Fei Zhao & Youyong Liao & Guilin Yang & Chinyin Chen, 2016. "Decoupling Design and Verification of a Free-Piston Linear Generator," Energies, MDPI, vol. 9(12), pages 1-23, December.
    3. 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.
    4. Guo, Chendong & Zuo, Zhengxing & Feng, Huihua & Jia, Boru & Roskilly, Tony, 2020. "Review of recent advances of free-piston internal combustion engine linear generator," Applied Energy, Elsevier, vol. 269(C).

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