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Prediction of thermal radiation received by vertical targets based on two-dimensional flame shape from rectangular n-heptane pool fires with different aspect ratios

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  • Ji, Jie
  • Gong, Changzhi
  • Wan, Huaxian
  • Gao, Zihe
  • Ding, Long

Abstract

Regarded as a cause of energy dissipation, thermal radiation plays an important role in combustion systems. This work aims to study the flame radiation property of rectangular energy sources. Total nine n-heptane pools with the same width of 8 cm but different aspect ratios of length to width (n = l/w) from 1 to 14 were used as fire sources in open space. The mass loss rate (MLR), flame shape and radiant fluxes received by external vertical targets were analyzed. The MLR per unit length (m˙l) and flame height show three trends of decreasing slopes with increasing n, the boundary are 3 and 10 and the fuel shape becomes linear when n ≥ 10. A new method of two-dimensional description is introduced to determine the mean flame height distribution along the pool length, a piecewise function consisting of three stages is proposed. Assuming the radiative fraction of heptane is 0.3, the radiant fluxes to external targets are calculated by applying a modified weighted multi-point source (WMP) model, which extends the weight to a two-dimensional flame plane. The proposed model is validated by comparing with the other models and using the experimental data in this work.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:185:y:2019:i:c:p:644-652
    DOI: 10.1016/j.energy.2019.07.083
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    References listed on IDEAS

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    1. Makhanlall, Deodat & Munda, Josiah L. & Jiang, Peixue, 2013. "Radiation energy devaluation in diffusion combusting flows of natural gas," Energy, Elsevier, vol. 61(C), pages 657-663.
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    Cited by:

    1. 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).
    2. 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).
    3. 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).
    4. Dou, Yuling & Liu, Haiqiang & Liu, Bin & Zhang, Yu & Liu, Yongqiang & Cheng, Xiaozhang & Tao, Changfa, 2021. "Effects of carbon dioxide addition to fuel on flame radiation fraction in propane diffusion flames," Energy, Elsevier, vol. 218(C).
    5. 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).
    6. 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).
    7. Wang, Chen & Hu, Haowei & Zhang, Hao & Ji, Jie & Wang, Zhigang, 2022. "Experimental study of the horizontal subsurface flow trajectory and dynamic external radiation of flame spread over diesel," Energy, Elsevier, vol. 260(C).
    8. Yang, Jianfeng & Zhang, Bo & Chen, Liangchao & Diao, Xu & Hu, Yuanhao & Suo, Guanyu & Li, Ru & Wang, Qianlin & Li, Jinghai & Zhang, Jianwen & Dou, Zhan, 2023. "Improved solid radiation model for thermal response in large crude oil tanks," Energy, Elsevier, vol. 284(C).
    9. 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).
    10. 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).
    11. 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).

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