通风风速对分岔巷道内火灾烟气分布的影响数值研究
Numerical research on the influence of ventilation velocity on fire smoke distribution in bifurcated roadway
丁翠1
作者信息
- 1. 中国劳动关系学院 安全工程学院,北京 100048
- 折叠
摘要
为探究通风风速对分岔巷道内火灾烟气流动的影响,采用CFD数值模拟方法研究了火源位于主巷分岔口上游附近时,通风风速对烟气逆流长度、主巷下游和分巷内温度及CO质量浓度纵向分布的影响规律.研究结果表明:主巷内烟气逆流长度随着通风风速的增大呈现线性降低规律;不同通风风速下,呼吸带高度处分巷内平均温度略高于主巷下游,最大温差 8℃;随着通风风速增大,主巷下游和分巷内呼吸带高度平均温度呈现出幂函数下降规律;随着通风风速的增大,呼吸带高度处主巷下游和分巷内CO质量浓度差值逐渐降低,最小质量浓度差为9.25 mg/m3,主巷下游和分巷内CO平均质量浓度均符合幂函数的下降趋势;当通风风速为1～3 m/s时,分巷道内工作人员不易受到火灾烟气有毒气体侵害,当通风风速为 1.5～3 m/s时主巷下游内工作人员不易受到火灾烟气有毒气体侵害.
Abstract
In order to investigate the influence of ventilation velocity on fire smoke distribution in bifurcated roadway,the computa-tional fluid dynamics(CFD)numerical method was adopted to simulate the fires located in upstream of main-roadway.The influ-ence of ventilation velocity on the length of smoke backflow and the temperature distribution and CO mass concentration distribu-tion in main-roadway and sub-roadway were analyzed.The results showed that the length of smoke backflow decreased linearly as the increasing of ventilation velocity.The average temperature at the height of breathing zone in sub-roadway was little higher than that in main-roadway downstream under different ventilation velocity condition,and the biggest temperature difference is 8℃.The relationship between ventilation velocity and the average temperature at the height of breathing zone in main-roadway downstream and in sub-roadway fitted in power function trend.The CO mass concentration difference between main-roadway downstream and sub-roadway decreased gradually as the increasing of ventilation velocity,and the smallest mass concentration difference was 9.25 mg/m3.The relationship between ventilation velocity and the CO average mass concentration at the height of breathing zone in main-roadway downstream and in sub-roadway fitted in power function trend.When the ventilation velocity is 1-3 m/s,the workers in the sub-roadway are less susceptible to fire smoke and toxic gases,and when the ventilation velocity is 1.5-3 m/s,the workers in the main-roadway downstream are less susceptible to fire smoke and toxic gases
关键词
矿井火灾/分岔巷道/通风风速/烟气分布/数值模拟Key words
mine fire/bifurcated roadway/ventilation velocity/smoke distribution/numerical simulation引用本文复制引用
出版年
2025
国家科技期刊平台
NSTL
万方数据