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Large eddy simulation of n-Dodecane spray combustion in a high pressure combustion vessel

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  • Gong, Cheng
  • Jangi, Mehdi
  • Bai, Xue-Song

Abstract

Autoignition and stabilization of n-Dodecane spray combustion under diesel engine like conditions are investigated using large eddy simulation and detailed chemical kinetics. The Spray A cases of Engine Combustion Network (ECN) with ambient temperatures of 900K and 1000K are considered. Two-stage ignition behavior is predicted in the studied conditions. It is found that the first-stage ignition occurs on the fuel-lean mixture, whereas the second-stage ignition starts on the fuel-rich mixture. The first stage ignition in the fuel-lean mixture promotes the first and the second stage ignition in the fuel-rich mixture owing to rapid turbulent mixing. Two mechanisms, autoignition and flame propagation coupling with the low temperature ignition, are used to explain the lift-off position and stabilization of the combustion process. They compete with each other, and their relative importance depends on the ambient temperature. The ambient temperature is shown to affect the soot emission in the flame through its influences on the lift-off length and the reaction zone structure. Higher ambient temperature results in a shorter lift-off length, which gives rise to higher soot emission due to the lower air entrainment to the fuel-rich zone in front of the flame. In the lower temperature case, the flame is stabilized by an autoignition induced flame front where a considerable amount of fuel is oxidized to CO at the leading front of the flame. Consequently, it reduces the soot formation in the flame.

Suggested Citation

  • Gong, Cheng & Jangi, Mehdi & Bai, Xue-Song, 2014. "Large eddy simulation of n-Dodecane spray combustion in a high pressure combustion vessel," Applied Energy, Elsevier, vol. 136(C), pages 373-381.
  • Handle: RePEc:eee:appene:v:136:y:2014:i:c:p:373-381
    DOI: 10.1016/j.apenergy.2014.09.030
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    Citations

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    Cited by:

    1. Rickard Solsjö & Mehdi Jangi & Bengt Johansson & Xue-Song Bai, 2020. "The Role of Multiple Injections on Combustion in a Light-Duty PPC Engine," Energies, MDPI, vol. 13(21), pages 1-18, October.
    2. Xu, Shijie & Zhong, Shenghui & Pang, Kar Mun & Yu, Senbin & Jangi, Mehdi & Bai, Xue-song, 2020. "Effects of ambient methanol on pollutants formation in dual-fuel spray combustion at varying ambient temperatures: A large-eddy simulation," Applied Energy, Elsevier, vol. 279(C).
    3. Fischer, M. & Jiang, X., 2015. "Numerical optimisation for model evaluation in combustion kinetics," Applied Energy, Elsevier, vol. 156(C), pages 793-803.
    4. Liu, Xinlei & Wang, Hu & Wang, Xiaofeng & Zheng, Zunqing & Yao, Mingfa, 2017. "Experimental and modelling investigations of the diesel surrogate fuels in direct injection compression ignition combustion," Applied Energy, Elsevier, vol. 189(C), pages 187-200.
    5. Jia, Guorui & Wang, Hu & Tong, Laihui & Wang, Xiaofeng & Zheng, Zunqing & Yao, Mingfa, 2017. "Experimental and numerical studies on three gasoline surrogates applied in gasoline compression ignition (GCI) mode," Applied Energy, Elsevier, vol. 192(C), pages 59-70.
    6. Zhang, Min & Ong, Jiun Cai & Pang, Kar Mun & Bai, Xue-Song & Walther, Jens H., 2022. "Large eddy simulation of soot formation and oxidation for different ambient temperatures and oxygen levels," Applied Energy, Elsevier, vol. 306(PB).
    7. Zhong, Shenghui & Xu, Shijie & Bai, Xue-Song & Peng, Zhijun & Zhang, Fan, 2021. "Large eddy simulation of n-heptane/syngas pilot ignition spray combustion: Ignition process, liftoff evolution and pollutant emissions," Energy, Elsevier, vol. 233(C).
    8. Wen, Xu & Luo, Kun & Luo, Yujuan & Kassem, Hassan I. & Jin, Hanhui & Fan, Jianren, 2016. "Large eddy simulation of a semi-industrial scale coal furnace using non-adiabatic three-stream flamelet/progress variable model," Applied Energy, Elsevier, vol. 183(C), pages 1086-1097.
    9. Thomas Lauer & Jens Frühhaber, 2020. "Towards a Predictive Simulation of Turbulent Combustion?—An Assessment for Large Internal Combustion Engines," Energies, MDPI, vol. 14(1), pages 1-26, December.
    10. Raza, Mohsin & Wang, Hu & Yao, Mingfa, 2019. "Numerical investigation of reactivity controlled compression ignition (RCCI) using different multi-component surrogate combinations of diesel and gasoline," Applied Energy, Elsevier, vol. 242(C), pages 462-479.
    11. Payri, Raúl & Salvador, F.J. & Manin, Julien & Viera, Alberto, 2016. "Diesel ignition delay and lift-off length through different methodologies using a multi-hole injector," Applied Energy, Elsevier, vol. 162(C), pages 541-550.

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