坡度对隧道火灾温度分布特性的影响研究  

Slope Effects on Temperature Distribution Characteristics in Tunnel Fires

作　　者：黄洋[1] 张英[1] 牛奕[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉市430070

出　　处：《公路》2015年第9期268-272,共5页Highway

基　　金：国家自然科学基金;项目编号51404178

摘　　要：为了研究隧道火灾的坡度效应,采用CFD数值模拟的方法对不同坡度下的隧道火灾烟气蔓延及温度分布特性进行了模拟。结果发现,与水平隧道相似,不同坡度下隧道纵向温度沿程分布呈指数衰减规律;然而,由于隧道坡度诱导的火风压会对烟气蔓延产生作用,使得烟气在不同区域表现出不同的坡度效应。在火区,拱顶温度随坡度增加而增加;在火区上游,拱顶温度随坡度增加而减小;在火区下游,拱顶温度基本不随坡度变化。另外,通过数据拟合建立了与坡度相关的隧道上游烟气温度纵向分布的理论预测关系式。To explore slope effects under tunnel fires, the smoke diffusion and its temperature distribution characteristics are studied by means of CFD numerical simulation method. Results show that, like the horizontal tunnel, the temperature exponential decreases with the distance from fire under different tunnel slopes, however, different slope effects on temperature are observed in different tunnel areas due to the influence by induced fire wind pressure on smoke diffusion. In fire area, the ceiling temperature increases with slope. The ceiling temperature drops with slope in upstream fire area, but remains unchanged in downstream fire area. Moreover, a fitted function of slope is obtained to predict the temperature distribution along tunnel in upstream fire area.

关 键 词：隧道火灾 坡度效应 顶棚烟气温度 CFD 研究 

分 类 号：U453.5[建筑科学—桥梁与隧道工程]