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

作　　者：丁翠 DING Cui(School of Safety Engineering,China University of Labor Relations,Beijing 100048,China)

机构地区：[1]中国劳动关系学院安全工程学院,北京100048

出　　处：《煤矿安全》2025年第1期93-99,共7页Safety in Coal Mines

基　　金：中国劳动关系学院校级一般资助项目(24XYJS009);河南省瓦斯地质与瓦斯治理重点实验室-省部共建国家重点实验室培育基地开放基金资助项目(WS2022B11)

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/m^(3),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。In order to investigate the influence of ventilation velocity on fire smoke distribution in bifurcated roadway,the computational fluid dynamics(CFD)numerical method was adopted to simulate the fires located in upstream of main-roadway.The influence of ventilation velocity on the length of smoke backflow and the temperature distribution and CO mass concentration distribution 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/m^(3).The relationship between ventilation velocity and the CO average mass concentration at the height of breathing zone in mainroadway 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 

分 类 号：TD752.2[矿业工程—矿井通风与安全]