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An experimental investigation into the starting process of free-piston engine generator

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Listed:
  • Jia, Boru
  • Tian, Guohong
  • Feng, Huihua
  • Zuo, Zhengxing
  • Roskilly, A.P.

Abstract

This paper presents an experimental investigation of the starting process of a prototype free piston engine generator (FPEG). Experimental test results show that during the motoring stage, the peak in-cylinder pressure and compression ratio increase in a non-linear manner and trend to reach a stable state after a number of cycles. The motoring force is suggested to be within a reasonable range. With a fixed starting force of 125N, the in-cylinder air fuel mixture was successfully ignited at the fourth cycle with a compression ratio of over 9:1. The peak in-cylinder pressure for the first combustion cycle reached over 40bar. The piston ran at high and relatively constant speed at the middle portion of the stroke. The peak piston velocity increases significantly to around 4.0m/s. Cycle-to-cycle variation of the piston movement was significant and the engine misfired frequently. During the misfire cycles, the peak piston velocity decreased to nearly 2.5m/s; and the piston dynamics were similar to the motoring process. Based on these, discussion on misfire and further stable running control, as well as the linear electric machine mode switch were presented.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:157:y:2015:i:c:p:798-804
    DOI: 10.1016/j.apenergy.2015.02.065
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    References listed on IDEAS

    as
    1. Mikalsen, R. & Roskilly, A.P., 2010. "The control of a free-piston engine generator. Part 1: Fundamental analyses," Applied Energy, Elsevier, vol. 87(4), pages 1273-1280, April.
    2. 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.
    3. Mao, Jinlong & Zuo, Zhengxing & Feng, Huihua, 2011. "Parameters coupling designation of diesel free-piston linear alternator," Applied Energy, Elsevier, vol. 88(12), pages 4577-4589.
    4. 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.
    5. 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.
    6. Xiao, Jin & Li, Qingfeng & Huang, Zhen, 2010. "Motion characteristic of a free piston linear engine," Applied Energy, Elsevier, vol. 87(4), pages 1288-1294, April.
    7. Mao, Jinlong & Zuo, Zhengxing & Li, Wen & Feng, Huihua, 2011. "Multi-dimensional scavenging analysis of a free-piston linear alternator based on numerical simulation," Applied Energy, Elsevier, vol. 88(4), pages 1140-1152, April.
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