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Flow and Heat Transfer Characteristics of Supercritical N-Decane in Adjacent Cooling Channels with Opposite Flow Directions

Author

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  • Dongpeng Jia

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Ning Wang

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Yu Pan

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Chaoyang Liu

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Shiwei Wang

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Kai Yang

    (Science and Technology on Scramjet Laboratory, College of Aerospace Science and Engineering, National University of Defense Technology, Changsha 410073, China)

  • Jian Liu

    (School of Aeronautics and Astronautics, Central South University, Changsha 410073, China)

Abstract

To ensure the safety of a scramjet, an arrangement scheme of adjacent regenerative cooling channels with opposite flow directions is adopted to decrease the maximum wall temperature. Based on extended corresponding-state methods, the flow and heat transfer characteristics of supercritical n-decane in cooling channels with same and opposite flow directions under a pressure of 3 MPa are comprehensively investigated in this paper. Compared to adjacent cooling channels with same flow direction, the local maximum wall temperature in adjacent cooling channels with opposite directions is notably reduced. Moreover, the effects of the heat flux and gravity on the development of flow field are analysed. A pair of recirculation zones is found close to the bottom wall of the cooling channels along the flow direction, the scale of which greatly expands with increasing heat flux. Once the heat flux density reaches a critical value, a phenomenon of flow asymmetry occurs. In addition, the small recirculation zones induced by the buoyancy force narrow when the gravity and heat flux directions remain the same, and the gravity effect could inhibit the generation of small-scale vortices and flow asymmetry.

Suggested Citation

  • Dongpeng Jia & Ning Wang & Yu Pan & Chaoyang Liu & Shiwei Wang & Kai Yang & Jian Liu, 2021. "Flow and Heat Transfer Characteristics of Supercritical N-Decane in Adjacent Cooling Channels with Opposite Flow Directions," Energies, MDPI, vol. 14(4), pages 1-19, February.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:4:p:1071-:d:501442
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    References listed on IDEAS

    as
    1. Seung-Min Jeong & Jeong-Yeol Choi, 2020. "Combined Diagnostic Analysis of Dynamic Combustion Characteristics in a Scramjet Engine," Energies, MDPI, vol. 13(15), pages 1-21, August.
    2. Yanhong Wang & Sufen Li & Ming Dong, 2014. "Numerical Study on Heat Transfer Deterioration of Supercritical n-Decane in Horizontal Circular Tubes," Energies, MDPI, vol. 7(11), pages 1-20, November.
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    Cited by:

    1. Zhiliang Lei & Zewei Bao, 2023. "Supercritical Heat Transfer and Pyrolysis Characteristics of n-Decane in Circular and Rectangular Channels," Energies, MDPI, vol. 16(9), pages 1-15, April.

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