受限空间内声场抑制线缆火蔓延研究  

Research on Acoustical Suppression of Flame Spread Over Electric Wire in Confined Space

作　　者：吕敬龙 熊才溢 陈国华[1] LÜJinglong;XIONG Caiyi;CHEN Guohua(School of Mechanical&Automotive Engineering,South China University of Technology,Guangzhou 510641,China)

机构地区：[1]华南理工大学机械与汽车工程学院,广州510641

出　　处：《工程热物理学报》2025年第3期1009-1016,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金资助项目(No.52006185)。

摘　　要：本文通过实验探究了声场对火蔓延的抑制行为,围绕铜芯线缆的水平火蔓延为主要对象,测试了不同结构声场的熄火能力。研究发现,随频率和压力改变,声场会对火蔓延同时起到促进与抑制作用。此外,与自由声场相比,受限空间内声场可通过侧壁反射大幅提升声压及介质流速,进而提升灭火效率。基于此,本文构造了耦合声场结构和声学参数的火蔓延模型,并基于拉伸率讨论了声场抑制火蔓延机制。本文可为清洁抑制建筑电气火蔓延提供新思路。This study experimentally investigated the suppressing effect of sound field on fire spread.The extinguishing performance of sound fields with different structures on flame spread over horizontal electrical wires was explored.Results showed that the sound field can both suppresses and facilitates flame spread,as the sound frequencies and sound pressures varying.In addition,the sound field in confined space performs more excellent on flame extinction than free one.Due to the significant enhancement of sound pressure and medium flow velocity(acoustic streaming)caused by sidewall reflection.Moreover,a fire spread model coupling the structure of sound field and acoustic parameters was formulated.The mechanism behind wire fire extinction in sound field was analyzed based on stretch rate.This study can provide valuable insights for suppressing electrical fire spread in buildings without any residue.

关 键 词：受限空间 外加声场 线缆火 火蔓延 熄火机理 

分 类 号：TK123[动力工程及工程热物理—工程热物理]