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Effect of oxygen content on n-heptane auto-ignition characteristics in a HCCI engine

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  • Wu, Zhijun
  • Kang, Zhe
  • Deng, Jun
  • Hu, Zongjie
  • Li, Liguang

Abstract

To take maximum advantage of the high efficiency of homogeneous charge compression ignition combustion mode and internal combustion Rankine cycle concept, in this study, the n-heptane auto-ignition characteristics have been investigated using a compression ignition internal combustion Rankine cycle engine test bench and a zero-dimensional thermodynamic model coupled with a detailed kinetic model. The n-heptane auto-ignition process shows that under both air and oxygen intake, a typical two-stage combustion in which oxygen enrichment has very minor effects on the n-heptane high temperature reaction. The higher specific heat capacity of oxygen compared with nitrogen leads to an overall increased specific heat capacity, which lowers the in-cylinder temperature during compression stroke, thereby delaying the low temperature reaction initial timing. The higher oxygen content also improves the H-atom abstraction, first O2 addition, second O2 addition and peroxyalkylhydroperoxide isomerization, thereby improving the overall reaction rate and the heat release fraction of low temperature reaction. As a result, the in-cylinder temperature at the end of low temperature reaction also increases, thereby shortening significantly the negative temperature coefficient duration compared with a combustion cycle using air as oxidizer.

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  • Wu, Zhijun & Kang, Zhe & Deng, Jun & Hu, Zongjie & Li, Liguang, 2016. "Effect of oxygen content on n-heptane auto-ignition characteristics in a HCCI engine," Applied Energy, Elsevier, vol. 184(C), pages 594-604.
    • Handle: RePEc:eee:appene:v:184:y:2016:i:c:p:594-604
    DOI: 10.1016/j.apenergy.2016.10.050
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    References listed on IDEAS

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    2. Moradi, Jamshid & Gharehghani, Ayat & Mirsalim, Mostafa, 2020. "Numerical investigation on the effect of oxygen in combustion characteristics and to extend low load operating range of a natural-gas HCCI engine," Applied Energy, Elsevier, vol. 276(C).
    3. Wu, Jingtao & Zhang, Zhehao & Kang, Zhe & Deng, Jun & Li, Liguang & Wu, Zhijun, 2022. "An assessment methodology for fuel/water consumption co-optimization of a gasoline engine with port water injection," Applied Energy, Elsevier, vol. 310(C).
    4. Pachiannan, Tamilselvan & Zhong, Wenjun & Rajkumar, Sundararajan & He, Zhixia & Leng, Xianying & Wang, Qian, 2019. "A literature review of fuel effects on performance and emission characteristics of low-temperature combustion strategies," Applied Energy, Elsevier, vol. 251(C), pages 1-1.
    5. Zhe Kang & Zhehao Zhang & Jun Deng & Liguang Li & Zhijun Wu, 2019. "Experimental Research of High-Temperature and High-Pressure Water Jet Characteristics in ICRC Engine Relevant Conditions," Energies, MDPI, vol. 12(9), pages 1-17, May.

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