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Decoupling Analysis of Ignition Processes of Ammonia/N-Heptane Mixtures

Author

Listed:
  • Zheng Li

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Yilin Zhang

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Jingrui Li

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    School of Ship and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    CSSC Marine Power Zhenjiang Co., Ltd., Zhenjiang 212001, China)

  • Changchun Xu

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    School of Ship and Ocean Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China
    CSSC Marine Power Zhenjiang Co., Ltd., Zhenjiang 212001, China)

  • Huabing Wen

    (School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang 212003, China)

  • Jianhua Shen

    (CSSC Marine Power Zhenjiang Co., Ltd., Zhenjiang 212001, China)

  • Haiguo Jing

    (CSSC Marine Power Zhenjiang Co., Ltd., Zhenjiang 212001, China)

  • Haifeng Liu

    (State Key Laboratory of Engine, Tianjin University, Tianjin 300350, China)

  • Xinyan Wang

    (Center for Advanced Powertrain and Fuels, Brunel University London, London UB8 3PH, UK)

  • Hua Zhao

    (Center for Advanced Powertrain and Fuels, Brunel University London, London UB8 3PH, UK)

Abstract

To further understand the influence of n-heptane on the ignition process of ammonia, an isotope labeling method was applied in the current investigation to decouple the influence of the chemical effect, the thermal effect, and the effect of O radical from the oxidation of n-heptane on the ignition delay times (IDTs) of ammonia. An analysis of the time evolution of fuel, analysis of the time evolution of temperature, rate of consumption and production (ROP) analysis, and sensitivity analysis were conducted to gain a further understanding of the mechanism of the influence of the chemical effect, the thermal effect, and the effect of O radical on the ignition of ammonia. The results showed that the negative temperature coefficient (NTC) behavior of n-heptane is mitigated by the blending of ammonia, and this mitigated effect of ammonia is mainly due to the chemical effect. The IDTs of ammonia under low and medium temperatures are significantly shortened by the chemical effect at a n-heptane mass fraction of 10%. The promoting effect of the chemical effect decreases when the n-heptane mass fraction increases. The time evolution of n-heptane for NC 7 H 16 /ND 3 -G can be classified into three stages at 800 K, and the rapid consumption stage is mitigated by an increase in temperature. The rapid consumption stage is suppressed by the chemical effect of ammonia, while O radical has a promoting effect on the rapid consumption stage. The chemical effect will enhance the sensitivities of reactions associated with ammonia. As the n-heptane mass fraction increases, the sensitivities of reactions associated with n-heptane are enhanced. Correspondingly, the effect of reactions associated with ammonia is weakened. When the n-heptane mass fraction is 30%, only reactions related to n-heptane have a great influence on the ignition of ammonia/n-heptane fuel blends under the thermal effect + the effect of O radical or only the thermal effect.

Suggested Citation

  • Zheng Li & Yilin Zhang & Jingrui Li & Changchun Xu & Huabing Wen & Jianhua Shen & Haiguo Jing & Haifeng Liu & Xinyan Wang & Hua Zhao, 2024. "Decoupling Analysis of Ignition Processes of Ammonia/N-Heptane Mixtures," Energies, MDPI, vol. 17(19), pages 1-24, October.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:19:p:4938-:d:1491186
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    References listed on IDEAS

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    1. Shafiee, Shahriar & Topal, Erkan, 2009. "When will fossil fuel reserves be diminished?," Energy Policy, Elsevier, vol. 37(1), pages 181-189, January.
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