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The competing chemical and physical effects of transient fuel enrichment on heavy knock in an optical spark ignition engine

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  • Vafamehr, Hassan
  • Cairns, Alasdair
  • Sampson, Ojon
  • Koupaie, Mohammadmohsen Moslemin

Abstract

The work was concerned with improving understanding of the chemical and physical trade-offs when employing transient over-fuelling to control auto-ignition in gasoline spark ignition engines under knock intensities not usually tolerated in optical engines. The single cylinder engine used included full bore overhead optical access capable of withstanding unusually high in-cylinder pressures. Heavy knock was deliberately induced by adopting inlet air heating and a primary reference fuel blend of reduced octane rating. High-speed chemiluminescence imaging and simultaneous in-cylinder pressure data measurement were used to evaluate the combustion events. Under normal operation the engine was operated under port fuel injection with a stoichiometric air-fuel mixture. Multiple centred auto-ignition events were regularly observed, with knock intensities of up to ∼30bar. Additional excess fuel was then introduced directly into the end-gas in short transient bursts. As the mass of excess fuel was progressively increased a trade-off was apparent, with knock intensity first increasing by up to 65% before lower unburned gas temperatures suppressed knock under extremely rich conditions. This trade-off is not usually observed during conventional low intensity knock suppression via over-fuelling and has been associated with the competing effects of reducing auto-ignition delay time and charge cooling/ratio of specific heats. Overall, the results demonstrate the risks in employing excess fuel to suppress knock deep within a heavy knocking combustion regime (potentially including a Super-Knock regime).

Suggested Citation

  • Vafamehr, Hassan & Cairns, Alasdair & Sampson, Ojon & Koupaie, Mohammadmohsen Moslemin, 2016. "The competing chemical and physical effects of transient fuel enrichment on heavy knock in an optical spark ignition engine," Applied Energy, Elsevier, vol. 179(C), pages 687-697.
    • Handle: RePEc:eee:appene:v:179:y:2016:i:c:p:687-697
    DOI: 10.1016/j.apenergy.2016.07.038
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    References listed on IDEAS

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    1. Chen, Ceyuan & Pal, Pinaki & Ameen, Muhsin & Feng, Dengquan & Wei, Haiqiao, 2020. "Large-eddy simulation study on cycle-to-cycle variation of knocking combustion in a spark-ignition engine," Applied Energy, Elsevier, vol. 261(C).
    2. Lounici, M.S. & Benbellil, M.A. & Loubar, K. & Niculescu, D.C. & Tazerout, M., 2017. "Knock characterization and development of a new knock indicator for dual-fuel engines," Energy, Elsevier, vol. 141(C), pages 2351-2361.
    3. Xu, Han & Yao, Anren & Yao, Chunde & Gao, Jian, 2017. "Investigation of energy transformation and damage effect under severe knock of engines," Applied Energy, Elsevier, vol. 203(C), pages 506-521.
    4. Chen, Lin & Zhang, Ren & Pan, Jiaying & Wei, Haiqiao, 2020. "Effects of partitioned fuel distribution on auto-ignition and knocking under spark assisted compression ignition conditions," Applied Energy, Elsevier, vol. 260(C).
    5. Lijia Zhong & Changwen Liu, 2019. "Numerical Analysis of End-Gas Autoignition and Pressure Oscillation in a Downsized SI Engine Using Large Eddy Simulation," Energies, MDPI, vol. 12(20), pages 1-20, October.
    6. Zhang, Qinghui & Hao, Zhiyong & Zheng, Xu & Yang, Wenying, 2017. "Characteristics and effect factors of pressure oscillation in multi-injection DI diesel engine at high-load conditions," Applied Energy, Elsevier, vol. 195(C), pages 52-66.
    7. d'Adamo, A. & Breda, S. & Berni, F. & Fontanesi, S., 2019. "The potential of statistical RANS to predict knock tendency: Comparison with LES and experiments on a spark-ignition engine," Applied Energy, Elsevier, vol. 249(C), pages 126-142.
    8. Zhou, Lei & Hua, Jianxiong & Wei, Haiqiao & Dong, Kai & Feng, Dengquan & Shu, Gequn, 2018. "Knock characteristics and combustion regime diagrams of multiple combustion modes based on experimental investigations," Applied Energy, Elsevier, vol. 229(C), pages 31-41.
    9. Karvountzis-Kontakiotis, Apostolos & Vafamehr, Hassan & Cairns, Alasdair & Peckham, Mark, 2018. "Study on pollutants formation under knocking combustion conditions using an optical single cylinder SI research engine," Energy, Elsevier, vol. 158(C), pages 899-910.
    10. Shi, Hao & Uddeen, Kalim & An, Yanzhao & Pei, Yiqiang & Johansson, Bengt, 2021. "Multiple spark plugs coupled with pressure sensors: A new approach for knock mechanism study on SI engines," Energy, Elsevier, vol. 227(C).
    11. Xu, Han & Weng, Chunsheng & Gao, Jian & Yao, Chunde, 2020. "The effect of energy intensification on the formation of severe knock in internal combustion engines," Applied Energy, Elsevier, vol. 266(C).
    12. Xu, Han & Gao, Jian & Yao, Anren & Yao, Chunde, 2018. "The effect of the energy convergence and energy dissipation on the formation of severe knock," Applied Energy, Elsevier, vol. 228(C), pages 1243-1254.
    13. Chen, Lin & Wei, Haiqiao & Chen, Ceyuan & Feng, Dengquan & Zhou, Lei & Pan, Jiaying, 2019. "Numerical investigations on the effects of turbulence intensity on knocking combustion in a downsized gasoline engine," Energy, Elsevier, vol. 166(C), pages 318-325.
    14. Pan, Jiaying & Wei, Haiqiao & Shu, Gequn & Pan, Mingzhang & Feng, Dengquan & Li, Nan, 2017. "LES analysis for auto-ignition induced abnormal combustion based on a downsized SI engine," Applied Energy, Elsevier, vol. 191(C), pages 183-192.

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