欢迎访问过程工程学报, 今天是

过程工程学报 ›› 2026, Vol. 26 ›› Issue (7): 750-760.DOI: 10.12034/j.issn.1009-606X.225169

• 研究论文 • 上一篇    下一篇

不等间距对三根电线火蔓延及合并特性的影响

赵曰心， 黄新杰*， 尹志鹏， 盛栋   

  1. 安徽工业大学建筑工程学院，安徽 马鞍山 243032
  • 收稿日期:2025-06-16 修回日期:2025-11-19 出版日期:2026-07-28 发布日期:2026-07-28
  • 通讯作者: 黄新杰 hxj501@mail.ustc.edu.cn
  • 基金资助:
    安徽省高等学校科学研究项目

Effect of unequal spacing on the flame spread and merging characteristics of triple wires

Yuexin ZHAO,  Xinjie HUANG*,  Zhipeng YIN,  Dong SHENG   

  1. School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan, Anhui 243032, China
  • Received:2025-06-16 Revised:2025-11-19 Online:2026-07-28 Published:2026-07-28
  • Contact: HUANG Xin-jie hxj501@mail.ustc.edu.cn

RichHTML

PDF

摘要： 多导线平行布置作为电力系统的典型结构，其火焰间相互作用对火焰蔓延行为产生重要影响。本研究选取两种型号的聚乙烯绝缘电线(铜芯直径分别为6和8 mm，绝缘层厚度为2 mm)，通过控制两个间距参数(S1=0, 3, 6, 10, 12, 15, 18 mm, S2=3, 6, 10, 12, 15, 18, 20 mm，且S1<S2)，系统研究了三根电线在不等间距下的火焰蔓延与合并特性。实验结果表明，三个火焰呈现明显非对称特征，位于小间距侧的火焰1和火焰2在合并概率和火焰高度方面均大于火焰3，且平均火焰宽度显著增加。在不等间距条件下，三个火焰的热反馈同样存在显著差异，S1间距下的火焰1和火焰2之间热力学耦合作用更强，气相传热更为显著，从而导致其火蔓延速度高于火焰3。当间距逐渐增大，非对称特征逐渐减弱，直到火焰之间无相互作用。最后，建立了相应的火蔓延热量传递模型，该模型能够较好地预测火蔓延速度，预测误差在±20%以内。本研究可为多电线能源系统的布线间距设计提供参考，并丰富火蔓延理论体系，具有重要的现实意义。

关键词: 电线火蔓延, 不等间距, 非对称特征, 合并特性, 热量传递

Abstract: As a typical and critical configuration in power systems, the flame interaction among multiple conductors arranged in parallel significantly influences flame spread behavior. In this work, two types of polyethylene-insulated wires (with copper core diameters of 6 and 8 mm and an insulation thickness of 2 mm) were selected. By controlling a comprehensive set of spacing parameters, defined as S1 (0, 3, 6, 10, 12, 15, 18 mm) and S2 (3, 6, 10, 12, 15, 18, 20 mm) with the condition S1<S2, the flame spread and merging characteristics of triple wires under unequal spacing conditions were systematically investigated across a wide spectrum of configurations to understand their integral flame behavior. The experimental results revealed that the three flames exhibited distinct asymmetric characteristics due to the different spacing. Specifically, flame 1 and flame 2, located on the side with the smaller spacing (S1), demonstrated a higher flame merging probability (Pm) and greater flame height (Hf) than flame 3. Moreover, it was observed that the average flame width (Wf) increased significantly in the transverse direction. Thermal analysis further showed that the heat feedback among the three flames varied considerably depending on the spacing. Due to the strong thermodynamic coupling effect between flame 1 and flame 2, their gas phase heat transfer exceeded that of flame 3, resulting in a faster flame spread rate for the closely spaced pair. As the spacing between the wires was systematically increased, all previously noted asymmetric flame characteristics gradually diminished until there was no interaction between flames. Finally, a heat transfer model of flame spread was established, which accurately predicted the flame spread rate, and the prediction error was within ±20%. This study can provide corresponding wiring spacing designs for multi-wire energy systems and enrich the flame spread theories, both of which hold significant practical importance.

Key words: wire flame spread, unequal spacing, asymmetric characteristics, merging characteristics, heat transfer