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Global kinetic modeling in oxidation coking of supercritical hydrocarbon fuel

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  • Wu, Yongkang
  • Zhu, Jianqin
  • Cheng, Zeyuan
  • Wei, Yingchuan
  • Li, Xiang
  • Wei, Jiaqi
  • Tao, Zhi

Abstract

Oxidation coking poses a significant challenge to active regenerative cooling technology of advanced aircrafts and gas turbines utilizing hydrocarbon fuel as both an energy source and a coolant. In this paper, the influence of dissolved oxygen concentration, heat flux, pressure, and mass flow rate on the oxidation coking characteristics of supercritical hydrocarbon fuel RP-3 was experimentally investigated, finding temperature and dissolved oxygen concentration as the primary influencing factors. Further, a two-step kinetic model comprising a bulk reaction and a wall reaction, in which a density term and a wall temperature exponent term were added to represent the influence of working conditions on oxidation coking, was developed through experiments based on the pseudo-element method. The prediction deviation for the total coke mass after 2-h reactions obtained by three-dimensional simulations embedded with the proposed kinetic model is less than 10 %, while the prediction deviation of the coking rate remains below 30 %, in the range of Reynolds number from 5000 to 50000, temperature from 200 to 450 °C, and dissolved oxygen concentration from 4 to 16 ppm.

Suggested Citation

  • Wu, Yongkang & Zhu, Jianqin & Cheng, Zeyuan & Wei, Yingchuan & Li, Xiang & Wei, Jiaqi & Tao, Zhi, 2025. "Global kinetic modeling in oxidation coking of supercritical hydrocarbon fuel," Energy, Elsevier, vol. 334(C).
    • Handle: RePEc:eee:energy:v:334:y:2025:i:c:s0360544225034747
    DOI: 10.1016/j.energy.2025.137832
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