城市地下交通联系隧道火灾时围护结构的传热计算  

Heat Transfer Calculation of Envelope of Urban Traffic Link Tunnel Under Fire

作　　者：肖益民[1,2] 孙宁[1,2] 阳东[1,2] 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]重庆大学低碳绿色建筑国际联合研究中心,重庆400045

出　　处：《中国公路学报》2016年第3期98-105,共8页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51178482;51106189);高等学校学科创新引智计划项目(B13041)

摘　　要：为分析城市地下交通联系隧道(UTLT)发生火灾时的烟气流动情况,对隧道气流进行了整体的网络模拟计算;在考虑围护结构传热对气流温度和流量影响的基础上,建立了UTLT围护结构传热模型,分析并给出了围护结构的传热影响深度、初始温度分布、边界换热等定解条件的确定方法,导出了模型求解的离散方程组,并将围护结构传热计算融入网络计算模型。对某一城市地下交通联系隧道进行网络模拟计算,得到了该隧道温度分布、风量分布以及围护结构传热量。结果表明:围护结构传热对隧道内的风量和温度均有明显的影响,在模拟计算过程中不能忽略。In order to analyze the smoke flow situation of the urban traffic link tunnel（UTLT）under fire,network simulation calculation of tunnel airflow for the whole tunnel was carried out.Considering impact of heat transfer of envelope on the temperature and quantity of airflow,heat transfer model of UTLT envelope was established and the method to determine the definite conditions which included the influence depth of envelope heat transfer,the initial temperature distribution in envelope and the heat transfer on the boundary of envelope was proposed.Then discrete equations of the model were obtained and the calculation of heat transfer of envelope was integrated into network calculation models.Network simulation method was used to calculate the temperature distribution,airflow distribution,and heat flux of envelope of a UTLT in a city.The results show that heat transfer of envelope has a significant influence on the air quantity and temperature in the tunnel and it cannot be ignored in simulation calculation.

关 键 词：隧道工程 交通联系隧道 传热模型 火灾烟气流动 围护结构 

分 类 号：U459.2[建筑科学—桥梁与隧道工程]