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Study on combustion characteristics and ignition limits extending of micro free-piston engines

Author

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  • Wang, Qian
  • Wu, Fan
  • Zhao, Yan
  • Bai, Jin
  • Huang, Rong

Abstract

To solve problems of ignition and combustion based micro free-piston engines, the combustion characteristics and extension of the ignition limits of the micro free-piston engine were investigated. A single-shot visualized experiment was conducted for a micro free-piston engine with a combustion chamber diameter of 3 mm. The results reveal the micro free-piston engine performance concerning combustion pressure, temperature, power density, mass loss etc., especially three ignition types for micro free-piston engine with a mixture gas of methane and air under different compression ratios. Methods for extending ignition limits of mixture gas preheating, catalyzing and hydrogen addition were investigated by numerical simulation. The results reveal that the ignition time of mixture gas could be advanced, and the maximum pressure and temperature declined down in the micro-combustion chamber under certain conditions; also the flammability limits can be extended to improve the combustion stability for micro free-piston engine.

Suggested Citation

  • Wang, Qian & Wu, Fan & Zhao, Yan & Bai, Jin & Huang, Rong, 2019. "Study on combustion characteristics and ignition limits extending of micro free-piston engines," Energy, Elsevier, vol. 179(C), pages 805-814.
    • Handle: RePEc:eee:energy:v:179:y:2019:i:c:p:805-814
    DOI: 10.1016/j.energy.2019.05.003
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    References listed on IDEAS

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    1. Zongping Shao & Sossina M. Haile & Jeongmin Ahn & Paul D. Ronney & Zhongliang Zhan & Scott A. Barnett, 2005. "A thermally self-sustained micro solid-oxide fuel-cell stack with high power density," Nature, Nature, vol. 435(7043), pages 795-798, June.
    2. Formosa, Fabien & Fréchette, Luc G., 2013. "Scaling laws for free piston Stirling engine design: Benefits and challenges of miniaturization," Energy, Elsevier, vol. 57(C), pages 796-808.
    3. Zhang, Chen & Li, Ke & Sun, Zongxuan, 2015. "Modeling of piston trajectory-based HCCI combustion enabled by a free piston engine," Applied Energy, Elsevier, vol. 139(C), pages 313-326.
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    Cited by:

    1. Qinglin Zhang & Zhaoping Xu & Shuangshuang Liu & Liang Liu, 2020. "Effects of Injector Spray Angle on Performance of an Opposed-Piston Free-Piston Engine," Energies, MDPI, vol. 13(14), pages 1-17, July.
    2. Wenhua Yuan & Xueliang Huang & Jun Fu & Yi Ma & Guangming Li & Qike Huang, 2022. "Water Vapor Blending Ratio Effects on Combustion Thermal Performance and Emission of Hydrogen Homogeneous Charge Compression Ignition," Energies, MDPI, vol. 15(23), pages 1-16, November.
    3. Yuan, Chenheng & He, Lei & Zhou, Lifu, 2022. "Numerical simulation of the effect of spring dynamics on the combustion of free piston linear engine," Energy, Elsevier, vol. 254(PA).

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