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Characterizing burning behaviour of convection-controlled pool fires at sub-atmospheric pressure by stagnation theory

Author

Listed:
  • Guo, Youwei
  • Xiao, Guoqing
  • Chen, Jian
  • Xiong, XingYu
  • Deng, Hongbo
  • Liu, Xiang
  • Wang, Lingyuan
  • Li, Yuanyuan

Abstract

Pool fires play a critical role in examining the burning behaviour of diffusion flames and are sensitive to changes in scale and environmental conditions. Understanding the evolution of pool fires under low-pressure conditions, common in plateau or flight scenarios, is essential for both fire safety and energy utilization. This study investigates the effects of pressure on pool fires through a series of small-scale experiments carried out in a pressure chamber that provides stable conditions ranging from 95 kPa to 40 kPa. Pool scales between 7 cm and 16 cm were examined, a range dominated by convective heat transfer. Methanol and heptane were chosen to discern fuel-specific variations in burning behaviour under decreased pressure. The findings demonstrate an increase in the axial flame temperature with reducing pressure, while radiative output exhibits an inverse relationship with pressure. Additionally, convective heat transfer toward surroundings appears to rise with decreasing pressure. A modified stagnation theory solution is proposed to model the mass burning rate of convection-controlled pool fires under low pressure, which shows satisfactory agreement with the experimental data. This research could potentially contribute to the comprehension of pool fires and the safety of energy in sub-atmospheric pressure conditions in the future.

Suggested Citation

  • Guo, Youwei & Xiao, Guoqing & Chen, Jian & Xiong, XingYu & Deng, Hongbo & Liu, Xiang & Wang, Lingyuan & Li, Yuanyuan, 2024. "Characterizing burning behaviour of convection-controlled pool fires at sub-atmospheric pressure by stagnation theory," Energy, Elsevier, vol. 287(C).
    • Handle: RePEc:eee:energy:v:287:y:2024:i:c:s0360544223030839
    DOI: 10.1016/j.energy.2023.129689
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    References listed on IDEAS

    as
    1. Li, Manhou & Xu, Zhiguo & Luo, Qiuting & Wang, Changjian, 2023. "Investigation of bicubic flame radiation model of continuously opposed spilling fire over n-butanol fuel," Energy, Elsevier, vol. 272(C).
    2. Chen, Jian & Song, Ye & Yu, Yueyang & Xiao, Guoqing & Tam, Wai Cheong & Kong, Depeng, 2022. "The influence of a plate obstacle on the burning behavior of small scale pool fires: An experimental study," Energy, Elsevier, vol. 254(PB).
    3. 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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