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Effects of side-confined distance and wire spacing on the flame spread and merging characteristics over two energy wires

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  • Huang, Xinjie
  • Ding, Hailong
  • Yin, Zhipeng
  • Zhao, Yuexin
  • Wang, Miaomiao
  • Wang, Changlong

Abstract

The wire as an important carrier of energy transportation is widely used in many fields. This paper investigated the flame spread and mutual interaction behaviors over two energy wires under different side-confined distances of D = 0、3、6、9、12、15 and 18 mm, and wire spacings of S = 0、3、5、10、15、20 and 30 mm, respectively. The results show that the existence of sidewall leads to the competition mechanism of air entrainment restriction and heat feedback enhancement. When D ≤ 3 mm, the flame spread will be dominated by the air entrainment, as the sidewall will inhibit the burning; when D > 3 mm, oxygen supply is sufficient, and the sidewall will promote flame spread. Meanwhile, under the influence of the restricted sidewall, the flame merging will be enhanced. As the inner flame height is significantly stretched higher than that of the outer especially at D = 3–5 mm. Finally, a heat transfer model is built to quantitatively analyse the feedback heat fluxes of the gas zone, the solid zone and the sidewall zone. With the larger preheating length for the inner wire, the larger flame spread rate can be well predicted.

Suggested Citation

  • Huang, Xinjie & Ding, Hailong & Yin, Zhipeng & Zhao, Yuexin & Wang, Miaomiao & Wang, Changlong, 2025. "Effects of side-confined distance and wire spacing on the flame spread and merging characteristics over two energy wires," Energy, Elsevier, vol. 322(C).
    • Handle: RePEc:eee:energy:v:322:y:2025:i:c:s0360544225012265
    DOI: 10.1016/j.energy.2025.135584
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    References listed on IDEAS

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    1. Ma, Yuxuan & Sun, Xiepeng & Guo, Zhengda & Gu, Yan & Fujita, Osamu & Hu, Longhua, 2025. "Flame extinction over electrical wires under transverse flow: Critical damkohler number analysis incorporating solid-phase heat conduction," Energy, Elsevier, vol. 315(C).
    2. Xu, Desheng & Li, Yanfeng & Li, Junmei & Zhong, Hua & Li, Jiaxin & Huang, Youbo, 2025. "Combustion characteristics and flame morphological evolution of double-layer cable fires in urban utility tunnels with various laying spacings," Energy, Elsevier, vol. 315(C).
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