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Experimental study of the effect of ambient pressure on oscillating behavior of pool fires

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  • Chen, Jian
  • Tam, Wai Cheong
  • Tang, Wei
  • Zhang, Chao
  • Li, Changhai
  • Lu, Shouxiang

Abstract

Pool fires are known to exhibit self-sustained oscillatory behavior, which plays an important role in the understanding of flame and fire spreading. To investigate the effect of ambient pressure on oscillating behavior of pool fires, the ethanol pool fires with diameters from 2 to 10 cm were conducted under a wide range of pressure from 0.6 to 2.5 atm, where different pressure environments were achieved and maintained using a closed high pressure chamber. Based on the momentum conservation equation for the gas movement driven by buoyant force, the Gr number was derived to illustrate the change of flame structure and oscillation frequency. The results show that the Gr number could explain the flame structure changing from laminar to turbulent. The oscillation intensity, which was redefined using the probability contour of the flame, could be related with Grashof. Furthermore, it was noticed that the influence of ambient pressure and gravity on oscillation frequency depends on the different oscillation mechanisms. Based on the one-dimensional movement of vortex along the axis, a theoretical model was proposed to explain the effect of ambient pressure and gravity on frequency, and then the obtained relationship between Strouhal and Grashof was verified by the measured value.

Suggested Citation

  • Chen, Jian & Tam, Wai Cheong & Tang, Wei & Zhang, Chao & Li, Changhai & Lu, Shouxiang, 2020. "Experimental study of the effect of ambient pressure on oscillating behavior of pool fires," Energy, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s0360544220308902
    DOI: 10.1016/j.energy.2020.117783
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    References listed on IDEAS

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    1. Wan, Huaxian & Gao, Zihe & Ji, Jie & Zhang, Yongming, 2019. "Experimental study on flame radiant heat flux from two heptane storage pools and its application to estimating safety distance," Energy, Elsevier, vol. 182(C), pages 11-20.
    2. Ji, Jie & Gong, Changzhi & Wan, Huaxian & Gao, Zihe & Ding, Long, 2019. "Prediction of thermal radiation received by vertical targets based on two-dimensional flame shape from rectangular n-heptane pool fires with different aspect ratios," Energy, Elsevier, vol. 185(C), pages 644-652.
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    Cited by:

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    2. Wang, Jinhui & Zhang, Ruiqing & Wang, Yongchang & Shi, Long & Zhang, Shaogang & Liu, Jiahao, 2023. "Experimental study on combustion characteristics of pool fires in a sealed environment," Energy, Elsevier, vol. 283(C).
    3. Wang, Chen & Ji, Jie, 2023. "Experimental study of dynamic combustion behavior and heat transfer of heptane pool fire with burning time under thin fuel thickness (2.0 mm–14.0 mm)," Energy, Elsevier, vol. 270(C).
    4. Deng, Lei & Tang, Fei & Wang, Xinkai, 2021. "Uncontrollable combustion characteristics of energy storage oil pool: Modelling of mass loss rate and flame merging time of annular pools," Energy, Elsevier, vol. 224(C).
    5. Zhao, Jinlong & Zhang, Xiang & Zhang, Jianping & Wang, Wei & Chen, Changkun, 2022. "Experimental study on the flame length and burning behaviors of pool fires with different ullage heights," Energy, Elsevier, vol. 246(C).
    6. Tang, Fei & Hu, Peng & Shi, Congling, 2021. "Ceiling thermal impingement spread characteristics induced by wall-attached fires under various sub-atmospheric pressures," Energy, Elsevier, vol. 215(PB).
    7. Sun, Xiepeng & Zhang, Xiaolei & Lv, Jiang & Chen, Xiaotao & Hu, Longhua, 2023. "Experimental study on the buoyant turbulent diffusion flame height of various intermittent levels," Applied Energy, Elsevier, vol. 351(C).
    8. Xie, Kai & Cui, Yunjing & Qiu, Xingqi & Wang, Jianxin, 2020. "Experimental study on flame characteristics and air entrainment of diesel horizontal spray burners at two different atmospheric pressures," Energy, Elsevier, vol. 211(C).

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