宽度和载荷对沟槽地表火蔓延特性的影响  

Influence of Width and Load on Trench Surface Fire Spread Characteristics

作　　者：丁超 马双阳 肖康 尉锦超 刘思雨 焦艳 DING Chao;MA Shuangyang;XIAO Kang;WEI Jinchao;LIU Siyu;JIAO Yan(School of Environmental and Energy Engineering,Anhui Jianzhu University,Hefei Anhui 230601)

机构地区：[1]安徽建筑大学环境与能源工程学院,安徽合肥230601

出　　处：《湖北理工学院学报》2024年第2期15-21,共7页Journal of Hubei Polytechnic University

基　　金：安徽省高校优秀青年科研项目(项目编号:2022AH030037);安徽省高校优秀青年人才支持计划项目(项目编号:gxyqZD2022058);安徽省自然科学基金项目(项目编号:2008085QE268);安徽建筑大学引进人才项目(项目编号:2019QDZ21)。

摘　　要：为探究燃料床的宽度和燃料载荷对沟槽地表火蔓延燃烧特性的影响,设计了宽度分别为10、15、20 cm的燃料槽,分析了不同宽度和载荷条件下地表火蔓延速度、火焰高度和夹角、质量损失、滞留时间等燃烧特性的变化规律。结果表明,载荷越高,燃料的质量损失速率越大;相同载荷下,沟槽宽度越小,燃料消耗率越高。燃料槽侧壁使卷吸受限,火线成线性。火蔓延速率随宽度增加而增大,火焰高度随宽度和载荷增大而增大。在高载荷的情况下,火蔓延过程中产生大量可燃烟气,火焰形成向火蔓延方向的火焰夹角。In order to investigate the influence of the width of the fuel bed and the fuel load on the combustion characteristics of the trench surface fire spread,three fuel grooves with widths of 10 cm,15 cm and 20 cm respectively are designed.This paper analyzes the change rule of combustion characteristics such as surface fire spreading speed,flame height and angle of entrapment,mass loss,and retention time under different width and loading conditions.The results show that the higher the load,the higher the rate of mass loss of fuel;the smaller the width of the groove,the higher the rate of fuel consumption for the same load.The sidewalls of the fuel grooves confines the coil suction and the fire line becomes linear.The rate of fire spread increases with increasing width,and the flame height increases with increasing width and load.At high loads,a large amount of combustible smoke is produced during fire spread and the flame forms a flame pinch in the direction of fire spread.

关 键 词：地表火 燃料床宽度 载荷 火蔓延速率 质量损失 

分 类 号：X932[环境科学与工程—安全科学]