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Experimental study and new-proposed mathematical correlation of flame height of rectangular pool fire with aspect ratio and mass burning rate

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  • Li, Manhou
  • Han, Guangzhao
  • Geng, Shuwei

Abstract

An experimental study is carried out on the combustion characteristics of rectangular heptane pool fire with a fixed area of 400 cm2 but different aspect ratios of (length-width ratio, n) n = 1, 2, 4, 6, 8, 10, 12 and 16. The results show that the mass burning rate decreases initially and increases afterwards with an increase in aspect ratio. Based on heat transfer theory, the mass burning rate of rectangular pool fires versus aspect ratio is divided into two regimes, namely heat convection and flame radiation coupled regime and heat conduction-dominated regime with a threshold value of aspect ratio n = 6. The flame height has a positive relationship with mass burning rate but a negative relationship with aspect ratio. Based on air entrainment theory, a new correlation of flame height against coupling of mass burning rate and aspect ratio is proposed and validated by experimental observations. The hydraulic diameter is introduced into the classical formula of pulsation frequency, and the experimental and modelling results show that the pulsation frequency of flame height increases linearly with the hydrodynamic diameter incorporating aspect ratio of rectangular pool in the correlation of f∝(n+1n)12.

Suggested Citation

  • Li, Manhou & Han, Guangzhao & Geng, Shuwei, 2022. "Experimental study and new-proposed mathematical correlation of flame height of rectangular pool fire with aspect ratio and mass burning rate," Energy, Elsevier, vol. 255(C).
    • Handle: RePEc:eee:energy:v:255:y:2022:i:c:s0360544222015079
    DOI: 10.1016/j.energy.2022.124604
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    References listed on IDEAS

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    1. Ding, Long & Gong, Changzhi & Ge, Fanliang & Ji, Jie, 2021. "Experimental study on flame radiation characteristic from line pool fires of n-heptane fuel in open space," Energy, Elsevier, vol. 218(C).
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    Cited by:

    1. 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).
    2. Tong, Weixin & Ji, Jie & Wang, Chen & Li, Chunxiao & Zhu, Jiping, 2023. "Experimental study on the combustion behaviors of continuous methanol spill fires on the vertical plane," Energy, Elsevier, vol. 285(C).
    3. Shi, Congling & Deng, Lei & Ren, Fei & Tang, Fei, 2023. "Experimental study on the flame height evolution of two adjacent hydrocarbon pool fires under transverse air flow," Energy, Elsevier, vol. 262(PB).

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