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

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

Energy, 2025, vol. 322, issue C

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.

Keywords: Energy wire; Side-confined distance; Wire spacing; Flame spread; Heat transfer model (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:322:y:2025:i:c:s0360544225012265

DOI: 10.1016/j.energy.2025.135584

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