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Analysis of exergy loss of gasoline surrogate combustion process based on detailed chemical kinetics

Author

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  • Sun, Hongjie
  • Yan, Feng
  • Yu, Hao
  • Su, W.H.

Abstract

Chemical reaction is the most important source of combustion irreversibility in premixed conditions, but details of the exergy loss mechanisms have not been explored yet. In this study numerical analysis based on non-equilibrium thermodynamics combined with detailed chemical kinetics is conducted to explore the exergy loss mechanism of gasoline engine like combustion process which is simplified as constant volume combustion. The fuel is represented by the common accepted gasoline surrogates which consist of four components: iso-octane (57%), n-heptane (16%), toluene (23%), and 2-pentene (4%). We find that overall exergy loss is mainly composed of three peaks along combustion generated from chemical reactions in three stages, the conversion from large fuel molecules into small molecules (as Stage 1), the H2O2 loop-related reactions (as Stage 2), and the violent oxidation reactions of CO, H, and O (as Stage 3). The effects of individual combustion boundaries, including temperature, pressure, equivalence ratio, oxygen concentration, on combustion exergy loss have been widely investigated. The combined effects of combustion boundaries on the total loss of gasoline surrogates are also investigated. We find that in a gasoline engine with a compression ratio of 10, the total loss can be reduced from 31.3% to 24.3% using lean combustion. The total loss can be further reduced to 22.4% by introducing exhaust gas recirculation and boosting the inlet charge. If the compression ratio is increased to 17, the total loss can be decreased to 20.4%, and finally to 16.8%, if the compression ratio is further increased to 100.

Suggested Citation

  • Sun, Hongjie & Yan, Feng & Yu, Hao & Su, W.H., 2015. "Analysis of exergy loss of gasoline surrogate combustion process based on detailed chemical kinetics," Applied Energy, Elsevier, vol. 152(C), pages 11-19.
    • Handle: RePEc:eee:appene:v:152:y:2015:i:c:p:11-19
    DOI: 10.1016/j.apenergy.2015.04.087
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    References listed on IDEAS

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    3. Wei, Jianan & Liu, Haifeng & Zhu, Hongyan & Cai, Yuqing & Wang, Hu & Yao, Mingfa, 2023. "Energy analysis and optimization of iso-octane and n-heptane combustion process," Energy, Elsevier, vol. 262(PB).
    4. Li, Yaopeng & Jia, Ming & Kokjohn, Sage L. & Chang, Yachao & Reitz, Rolf D., 2018. "Comprehensive analysis of exergy destruction sources in different engine combustion regimes," Energy, Elsevier, vol. 149(C), pages 697-708.
    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. Khalili-Garakani, Amirhossein & Ivakpour, Javad & Kasiri, Norollah, 2016. "Evolutionary synthesis of optimum light ends recovery unit with exergy analysis application," Applied Energy, Elsevier, vol. 168(C), pages 507-522.
    7. Zhang, Xuan & Wei, Jianan & Liu, Haifeng & Cai, Yuqing & Wang, Hu & Yao, Mingfa, 2024. "The relationship between fuel reactivity and exergy features in combustion process," Energy, Elsevier, vol. 288(C).

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