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Experimental prediction on the performance and propagation of ceiling jets under the influence of wall confinement

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  • Gao, Zihe
  • Wan, Huaxian
  • Ji, Jie
  • Bi, Yubo

Abstract

Characteristics of ceiling jets propagation are very significant for energy detecting and controlling once an undesirable energy source releasing flame and toxic pollutant emissions is erupted in a building. In many cases, the impinging ceiling jet flame will be affected by the nearby wall, especially for the energy source very close to or immediately against a wall. Four sets of experiments were conducted with energy source in open space, confined by an unbounded ceiling, confined by a wall-ceiling configuration and confined by two parallel walls (a corridor-like structure). Results show that the impinging ceiling jet-flame behaves very differently in different wall-ceiling configurations, the ceiling flame extension and the heat flux to nearby field increases dramatically with increasing confinement strength, from unbounded ceiling to narrow confined corridor-like structure. Based on the limits of flame extension, the temperature distribution under the ceiling can be divided into the near-field region within the ceiling flame and the far-field region beyond the ceiling flame. Predictive correlations of ceiling flame and temperature distribution are proposed to account for different wall-ceiling configurations. The results of this study have implications to optimize the design and arrangement of the ceiling-mounted heat and energy detection, protection and controlling systems.

Suggested Citation

  • Gao, Zihe & Wan, Huaxian & Ji, Jie & Bi, Yubo, 2019. "Experimental prediction on the performance and propagation of ceiling jets under the influence of wall confinement," Energy, Elsevier, vol. 178(C), pages 378-385.
    • Handle: RePEc:eee:energy:v:178:y:2019:i:c:p:378-385
    DOI: 10.1016/j.energy.2019.04.138
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    References listed on IDEAS

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    Citations

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    Cited by:

    1. Bei Cao & Xiaodong Zhou & Yubiao Huang & Yuan Zheng & Kai Ye & Hong Liu & Lizhong Yang, 2020. "An Experimental Investigation of the External Wind Effects on the Ceiling Temperature Distribution of Fire-Induced Thermal Flow in a Corridor Connected to a Compartment," Energies, MDPI, vol. 13(7), pages 1-18, April.
    2. Qi, Zhenyao & Hu, Haowei & Ji, Jie, 2024. "Investigation on the burning behaviors of the combustible ceiling with the impingement of an incipient fire source," Energy, Elsevier, vol. 290(C).
    3. Guo, Fangyi & Ding, Long & Gao, Zihe & Yu, Longxing & Ji, Jie, 2020. "Effects of wind flow and sidewall restriction on the geometric characteristics of propane diffusion flames in tunnels," Energy, Elsevier, vol. 198(C).
    4. Wang, Zhenhua & Jiang, Juncheng & Wang, Guanghu & Ni, Lei & Pan, Yong & Li, Meng, 2023. "Flame morphologic characteristics of horizontally oriented jet fires impinging on a vertical plate: Experiments and theoretical analysis," Energy, Elsevier, vol. 264(C).
    5. Zhang, Xiaochun & Zhang, Zijian & Su, Guokai & Tang, Fei & Liu, Aihua & Tao, Haowen, 2020. "Experimental study on thermal hazard and facade flame characterization induced by incontrollable combustion of indoor energy usage," Energy, Elsevier, vol. 207(C).

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