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Investigation on the Potential of High Efficiency for Internal Combustion Engines

Author

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  • Haifeng Liu

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Junsheng Ma

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Laihui Tong

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Guixiang Ma

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Zunqing Zheng

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

  • Mingfa Yao

    (State Key Laboratory of Engines, Tianjin University, Tianjin 300072, China)

Abstract

The current brake thermal efficiency of advanced internal combustion engines is limited to 50%, and how to further improve the efficiency is a challenge. In this study, a theoretical investigation on engine thermal efficiency was carried out using one-dimension simulations based on the first law of thermodynamics. The energy balance was evaluated by varying parameters such as compression ratio (CR); heat transfer coefficient; intake charge properties; and combustion phasing etc.—their influences on the efficiency limits were demonstrated. Results show that for a given heat transfer coefficient, an optimal CR exists to obtain the peak efficiency. The optimal CR decreases with the increase of heat transfer coefficient, and high CR with a low heat-transfer coefficient can achieve a significantly high efficiency. A higher density and specific heat ratio of intake charge, as well as a shorter combustion duration with a proper CA50 (crank angle at 50% of total heat release), can increase efficiency significantly. Methanol shows an excellent ability in decreasing the peak in-cylinder temperature; and the peak indicated efficiency is relatively higher than other tested fuels. The displacement has few effects on the indicated efficiency, while it shows a strong effect on the energy distribution between heat transfer and exhaust energy. All these strategies with high CR result in high in-cylinder pressure and temperature; which means a breakthrough of material is needed in the future.

Suggested Citation

  • Haifeng Liu & Junsheng Ma & Laihui Tong & Guixiang Ma & Zunqing Zheng & Mingfa Yao, 2018. "Investigation on the Potential of High Efficiency for Internal Combustion Engines," Energies, MDPI, vol. 11(3), pages 1-20, February.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:513-:d:133772
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    References listed on IDEAS

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