Numerical simulation of smoke stratification in tunnel fires under longitudinal velocities

作     者：Yuhao Guo Zhongyuan Yuan Yanping Yuan Xiaoling Cao Peng Zhao 

作者机构：School of Mechanical EngineeringSouthwest Jiaotong University111Second Ring RoadChengdu CitySichuan Province 610031PR China 

出 版 物：《Underground Space》 (地下空间（英文）)

年 卷 期：2021年第6卷第2期

页      面：163-172页

核心收录：

学科分类：081406[工学-桥梁与隧道工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0813[工学-建筑学] 0814[工学-土木工程] 082301[工学-道路与铁道工程] 0823[工学-交通运输工程] 

基　　金：supported by the Sichuan Province Youth Science and Technology Innovation Team of Building Environment and Energy Efficiency(2015TD0015) the National Natural Science Foundation of China(Grant No.51708454) 

主　　题：Tunnel fire Longitudinal ventilation Smoke stratification 

摘      要：Use of the longitudinal critical velocity in tunnel fires may destroy the stratification of smoke downstream,which is not conducive to the evacuation of downstream tunnel *** the longitudinal velocity can maintain stratification,but the appropriate longitudinal velocity range is *** of smoke under the longitudinal velocity is studied using Fire Dynamics Simulator(FDS).The aims of this paper are to explore the relationship between the longitudinal velocity and smoke stratification and to obtain a proper velocity range that can maintain clear downstream *** on Newman s theory,thestratification velocityis proposed,which is the maximum velocity that maintains downstream smoke stratification.A good correspondence between the average Froude number within 200 m downstream and the longitudinal velocity and heat release rate(HRR)is *** correlation between the temperature stratification and Froude number is ***=0.49 can be used to distinguish whether the stratification is *** relationship between the critical velocity and the stratification velocity is also discussed.