Flame-retardant wire burning behavior by jet flame heating: Ignition, charring, and secondary flame spread

Fang，Le1; Liu，Xiongjun2; Han，Xiao2; Luo，Shengfeng3,4; Xie，Qiyuan1

2024-06-01

10.1016/j.firesaf.2024.104181

Fire Safety Journal   影响因子和分区

0379-7112

This research presents an in-depth examination of the combustion characteristics of flame-retardant electrical wires, contrasting behavior with non-flame-retardant counterparts under jet flame heating. The study systematically investigates the pyrolysis process, ignition patterns, charring behavior, and the development of secondary flames in wires with different core diameters and insulation materials. Findings indicate the heightened susceptibility of thinner wires to rapid heating, pyrolysis and charring, leading to faster ignition and more intense secondary flame development. This insight is crucial for tailoring flame-retardant formulations to specific wire dimensions. The research also delves into the thermal dynamics within the wires, highlighting how the core diameter influences axial heat conduction and, consequently, the overall flame spread behavior and pyrolysis rate. A critical discovery is the relationship between heating duration and flame sustainability, establishing a specific range of heating times for sustaining secondary flames in flame-retardant wires. Theoretical models used in the study explained the critical heat flux heating time for wire ignition, offering insights into improved fire prevention strategies, particularly in prolonged heat exposure scenarios. These findings not only advance our understanding of flame-retardant wire behavior under fire conditions but also provide guidance for selecting and using electrical wires, thereby optimizing fire safety in diverse applications.

Charing process Flame-retardant electrical wires Secondary flames Self-sustaining flame Theoretical model Wire diameter effects

SCI ; EI

英语

其他

ENGINEERING

2-s2.0-85193572590

Scopus

1.State Key Lab of Fire Science,University of Science and Technology of China,Hefei,230027,China
2.Academy of Science and Technology,Jiangsu Shangshang Cable Group Co.,Ltd.,Liyang,213300,China
3.Department of Mechanics and Aerospace Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Shenzhen Research Institute,China University of Mining and Technology,Shenzhen,518057,China

Fang，Le,Liu，Xiongjun,Han，Xiao,et al. Flame-retardant wire burning behavior by jet flame heating: Ignition, charring, and secondary flame spread[J]. Fire Safety Journal,2024,146.

Fang，Le,Liu，Xiongjun,Han，Xiao,Luo，Shengfeng,&Xie，Qiyuan.(2024).Flame-retardant wire burning behavior by jet flame heating: Ignition, charring, and secondary flame spread.Fire Safety Journal,146.

Fang，Le,et al."Flame-retardant wire burning behavior by jet flame heating: Ignition, charring, and secondary flame spread".Fire Safety Journal 146(2024).