悬挂电缆火蔓延速率增加机制

doi:10.16265/j.cnki.issn1003-3033.2025.11.0453

中国安全科学学报 ›› 2025, Vol. 35 ›› Issue (11): 157-163.doi: 10.16265/j.cnki.issn1003-3033.2025.11.0453

悬挂电缆火蔓延速率增加机制

彭伟¹^,²(), 王依婷², 张少杰²^,^**(), 任俊生², 周月², 谷恒²

¹ 安徽理工大学公共安全与应急管理学院,安徽合肥 231131
² 安徽理工大学安全科学与工程学院,安徽淮南 232000

收稿日期:2025-06-08 修回日期:2025-08-15 出版日期:2025-11-28
通信作者:
^** 张少杰(1991—),男,安徽太和人,博士,讲师,主要从事火灾动力学、锂离子电池安全方面的研究。E-mail: zsjay@mail.ustc.edu.cn。
作者简介:
彭伟教授 (1981—),男,安徽淮南人,博士,教授,主要从事火灾防治方面的研究。E-mail:wpeng@aust.edu.cn。
基金资助:
安徽高校自然科学研究项目(2024AH040063)

Study on mechanism of increased fire spread rate of suspended cables

PENG Wei¹^,²(), WANG Yiting², ZHANG Shaojie²^,^**(), REN Junsheng², ZHOU Yue², GU Heng²

¹ School of Public Safety and Emergency Management,Anhui University of Science and Technology, Anhui Hefei 231131, China
² School of Safety Science and Engineering, Anhui University ofScience and Technology, Anhui Huainan 232000, China

Received:2025-06-08 Revised:2025-08-15 Published:2025-11-28

摘要/Abstract

摘要： 为明确下垂角度对电缆火蔓延特性的影响,构建电缆燃烧试验平台,开展不同下垂角度(θ)及不同横截面积(S)的电缆燃烧试验。结果表明:电缆水平布置时火焰呈现轴对称锥形状态;下垂角度大于0°时,随着燃烧的进行,火焰形态从多分叉锥形过渡到沿着电缆方向延伸状态。电缆火蔓延行为可分为3个阶段:阶段I热解前沿推进使火蔓延速率(FSR)增加;阶段II热对流与热辐射相互作用导致FSR快速增加;阶段III热辐射主导使FSR持续增加。燃烧产生的辐射热通量对FSR增加起主导作用,辐射热通量的迅速增加及峰值的出现与火蔓延3个阶段具有一致性,可作为增加阶段发生的标志。θ的增大和S减小会促进FSR增加,根据斯蒂芬-玻尔兹曼定律,提出FSR发生增加的θ与S关系式,且关系式理论指数与试验指数吻合较好。

关键词: 悬挂电缆, 火蔓延速率(FSR), 下垂角度, 横截面积, 热通量

Abstract:

In order to clarify the influence of droop angle on suspended cable fire spread characteristics, a cable combustion test platform was constructed. The cable combustion tests with different droop angles (θ) and different cross-sectional areas (S) were carried out. The results show that the flame presents an axisymmetric conical state when the cable is arranged horizontally. When the droop angle is greater than 0°, as the combustion progresses, the flame shape transits from a multi-branched cone to an extended state along the cable direction. The flame spread behavior of cable can be divided into three stages: the advance of the pyrolysis front in stage I increases FSR, the interaction between thermal convection and thermal radiation in stage II leads to a rapid increase of FSR. Stage III thermal radiation dominates the continuous increase of FSR. The radiation heat flux generated by combustion plays a leading role in the increase of FSR. The rapid increase of radiation heat flux and the appearance of peak value are consistent with the three stages of fire spread, which can be used as a sign of the increase stage. The increase of θ and the decrease of S will promote the increase of FSR. According to the Stephen-Boltzmann law, the relationship between θ and S for the increase of FSR is proposed, and the theoretical index of the relationship is in good agreement with the experimental index.

Key words: suspended cable, flame spread rate (FSR), droop angle, cross-sectional area, heat flux

中图分类号:

X932爆炸安全与防火、防爆

彭伟, 王依婷, 张少杰, 任俊生, 周月, 谷恒. 悬挂电缆火蔓延速率增加机制[J]. 中国安全科学学报, 2025, 35(11): 157-163.

PENG Wei, WANG Yiting, ZHANG Shaojie, REN Junsheng, ZHOU Yue, GU Heng. Study on mechanism of increased fire spread rate of suspended cables[J]. China Safety Science Journal, 2025, 35(11): 157-163.

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工况名称	S/mm²	θ/(°)
a₁―a₅	2.5, 4.0, 6.0, 10.0, 16.0	0
b₁―b₅		15
c₁―c₅		22.5
d₁―d₅		30
e₁―e₅		37.5
f₁―f₅		45
g₁―g₅		60

悬挂电缆火蔓延速率增加机制

Study on mechanism of increased fire spread rate of suspended cables

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