摘要
采用FDS数值模拟方法,对Ⅴ形坡隧道火灾时烟气运动特性及隧道纵向中心线上温度分布情况进行研究,并提出不同火灾位置时顶板最大温升参数经验预测模型。结果表明,火源位于变坡点右侧120 m时,隧道纵向中心线峰值温度点向下游偏移,偏移距离随坡度的增加而增加,隧道顶板最高温度随坡度的增加而减小。通过推导无量纲火源位置与变坡点距离不同时的最大温升参数预测模型得出,无量纲最大温升参数随无量纲火源位置的增大而增大、与无量纲热释放速率的0.8次幂成正比,且与隧道坡度呈非线性非单调关系。
By using the FDS numerical simulation method, the smoke movement characteristics of the Ⅴ-shaped slope tunnel and the temperature distribution on the longitudinal centerline of the tunnel during a fire are studied, and an empirical prediction model for the maximum temperature rise parameters of the roof at different fire positions is proposed. The results show that when the fire source is 120 m away from the right of the slope change point, the peak temperature point of the longitudinal centerline of the tunnel shifts to the downstream direction, the shift distance increases with the increase of the slope, and the maximum temperature of the tunnel roof decreases with the increase of the slope. By deriving the prediction model of the maximum temperature rise parameter when the distance between the nondimensional fire source position and the variable slope point is different, it is concluded that the dimensionless maximum temperature rise parameter increases with the increase of the dimensionless fire source position, and is proportional to the 0.8 th power of the dimensionless heat release rate, and has a nonlinear and non-monotonic relationship with the slope of the tunnel.
作者
姜学鹏
于思维
金俊
JIANG Xue-peng;YU Si-wei;JIN Jun(School of Resource and Environmental Engineering,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Fire Safety Technology Institute,Wuhan University of Science and Technology,Hubei Wuhan 430081,China;Hubei Provincial Industrial Safety Engineering Technology Research Center,Hubei Wuhan 430081,China)
出处
《消防科学与技术》
CAS
北大核心
2021年第5期672-678,共7页
Fire Science and Technology
基金
国家自然科学基金项目(51874213,51806156)
湖北省自然科学项目(2018CFB185,2018CFB226)。
关键词
Ⅴ形坡隧道
火灾烟气
最大温升
数值模拟
无量纲分析
Ⅴ-slope tunnel
fire smoke
maximum temperature rise
numerical simulation
non-dimensional analysis
