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The effects of intake backflow on in-cylinder situation and auto ignition in a gasoline controlled auto ignition engine

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  • Li, Nan
  • Xie, Hui
  • Chen, Tao
  • Li, Le
  • Zhao, Hua

Abstract

The inability to control the auto ignition in CAI combustion is an obstacle against its practical use, and the in-cylinder thermal and component distributions are being investigated in more depth as a way to control auto ignition. A 3D simulation using KIVA code is applied to study the effects of intake backflow on the in-cylinder situation. When the intake backflow is increased, the mean temperature is found to be significantly lower. In addition, the difference in the mean temperature of the cylinder reaches 40K at 320° CA ATDC for a 73–75.8% residual gas fraction. The in-cylinder temperature distribution becomes concentrative and the highest temperature in the cylinder decreases as the intake backflow increases. In this paper, the characteristics of the hot zone are studied, and the superposition ratio of the hot zone and the high residual gas fraction zone is proposed to represent the temperature and residual gas fraction of the mixture in the cylinder. The hot and relatively low residual gas fraction zone increases as the intake backflow increases. Experiments were performed on a single-cylinder engine with a variable valve system. Results indicated that the autoignition timing first delays and then advances as the intake backflow increases. The autoignition changes 3.7° CA at a 58.1–60.6% residual gas fraction. The intake backflow is a potential means of controlling auto ignition timing for CAI.

Suggested Citation

  • Li, Nan & Xie, Hui & Chen, Tao & Li, Le & Zhao, Hua, 2013. "The effects of intake backflow on in-cylinder situation and auto ignition in a gasoline controlled auto ignition engine," Applied Energy, Elsevier, vol. 101(C), pages 756-764.
    • Handle: RePEc:eee:appene:v:101:y:2013:i:c:p:756-764
    DOI: 10.1016/j.apenergy.2012.07.050
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    Citations

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    Cited by:

    1. Chen, Tao & Xie, Hui & Li, Le & Zhang, Lianfang & Wang, Xinyan & Zhao, Hua, 2014. "Methods to achieve HCCI/CAI combustion at idle operation in a 4VVAS gasoline engine," Applied Energy, Elsevier, vol. 116(C), pages 41-51.
    2. Li, Yangtao & Khajepour, Amir & Devaud, Cécile & Liu, Kaimin, 2017. "Power and fuel economy optimizations of gasoline engines using hydraulic variable valve actuation system," Applied Energy, Elsevier, vol. 206(C), pages 577-593.
    3. Hunicz, Jacek & Mikulski, Maciej, 2018. "Investigation of the thermal effects of fuel injection into retained residuals in HCCI engine," Applied Energy, Elsevier, vol. 228(C), pages 1966-1984.
    4. Jacek Hunicz & Aymen Tmar & Paweł Krzaczek, 2017. "Effects of Mixture Stratification on Combustion and Emissions of Boosted Controlled Auto-Ignition Engines," Energies, MDPI, vol. 10(12), pages 1-13, December.
    5. Song, Kang & Wang, Xinyan & Xie, Hui, 2018. "Trade-off on fuel economy, knock, and combustion stability for a stratified flame-ignited gasoline engine," Applied Energy, Elsevier, vol. 220(C), pages 437-446.
    6. Dalla Nora, Macklini & Zhao, Hua, 2015. "High load performance and combustion analysis of a four-valve direct injection gasoline engine running in the two-stroke cycle," Applied Energy, Elsevier, vol. 159(C), pages 117-131.

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