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Effect of a Taper Intake Port on the Combustion Characteristics of a Small-Scale Rotary Engine

Author

Listed:
  • Run Zou

    (School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

  • Yi Zhang

    (School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

  • Jinxiang Liu

    (School of Mechanical Engineering, Beijing Institute of Technology, Beijing 100081, China)

  • Wei Yang

    (School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

  • Yangang Zhang

    (School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

  • Feng Li

    (School of Energy and Power Engineering, North University of China, Taiyuan 030051, China)

  • Cheng Shi

    (School of Vehicle and Energy, Yanshan University, Qinhuangdao 066004, China)

Abstract

Taper intake ports are effective in improving the charging efficiency of small-scale rotary engines (REs), but it is unclear how their structural parameters affect the in-cylinder flow field and combustion characteristics. For this reason, the effects of the diameter-length ratio ( D / L ) of an intake port on the in-cylinder flow field and combustion characteristics of a small-scale RE were numerically investigated by utilizing a three-dimensional computational fluid dynamics (CFD) model. The results showed that the in-cylinder pressure of the RE did not follow a simple single-directional trend with the D / L of the intake port, but it was divided into three levels, where the peak in-cylinder pressure was at its maximum at the D / L of 0.6 and at its minimum at the D / L of 0.8. The gas flows in the intake port with different values of the D / L were all unidirectional, and they made a difference in the vortexes formed on the leading side of the combustion chamber of the RE, which was the main factor affecting the in-cylinder combustion performance. The vortexes formed on the leading side of the combustion chamber with D / L = 0.6 were maintained for a long period of time, thus promoting the propagation of flame and advancing the center of gravity of combustion. So, the heat release rate and combustion efficiency in the cylinder were increased at the price of a larger increment in nitrogen oxide formation.

Suggested Citation

  • Run Zou & Yi Zhang & Jinxiang Liu & Wei Yang & Yangang Zhang & Feng Li & Cheng Shi, 2022. "Effect of a Taper Intake Port on the Combustion Characteristics of a Small-Scale Rotary Engine," Sustainability, MDPI, vol. 14(23), pages 1-14, November.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:23:p:15809-:d:986339
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    References listed on IDEAS

    as
    1. Shi, Cheng & Chai, Sen & Di, Liming & Ji, Changwei & Ge, Yunshan & Wang, Huaiyu, 2023. "Combined experimental-numerical analysis of hydrogen as a combustion enhancer applied to wankel engine," Energy, Elsevier, vol. 263(PC).
    2. Fan, Baowei & Pan, Jianfeng & Yang, Wenming & Chen, Wei & Bani, Stephen, 2017. "The influence of injection strategy on mixture formation and combustion process in a direct injection natural gas rotary engine," Applied Energy, Elsevier, vol. 187(C), pages 663-674.
    3. Lev Finkelberg & Alexander Kostuchenkov & Andrei Zelentsov & Vladimir Minin, 2019. "Improvement of Combustion Process of Spark-Ignited Aviation Wankel Engine," Energies, MDPI, vol. 12(12), pages 1-11, June.
    4. Fan, Baowei & Pan, Jianfeng & Yang, Wenming & Pan, Zhenhua & Bani, Stephen & Chen, Wei & He, Ren, 2017. "Combined effect of injection timing and injection angle on mixture formation and combustion process in a direct injection (DI) natural gas rotary engine," Energy, Elsevier, vol. 128(C), pages 519-530.
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