Global kinetic modeling in oxidation coking of supercritical hydrocarbon fuel

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

Energy, 2025, vol. 334, issue C

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.

Keywords: Hydrocarbon fuel; Regenerative cooling; Oxidation coking; Kinetic model; Transient simulation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:334:y:2025:i:c:s0360544225034747

DOI: 10.1016/j.energy.2025.137832

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