文章基本信息

标题：Study on smoke exhaust performance in tunnel fires based on heat and smoke exhaust efficiency under the lateral centralized mode
本地全文：下载
作者：Pai Xu ; Daiqiang Zhu ; Rongjun Xing 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2022
卷号：34
页码：102002
语种：English
出版社：Elsevier B.V.
摘要：When a tunnel fire occurs, using quantitative indicators to evaluate the performance of smoke extraction system and determining a reasonable exhaust volume is the key to ensuring the high efficiency of the tunnel smoke extraction system. Based on the transfer mechanism in heat and mass flow rate of smoke, theoretical models are established to calculate the heat and smoke exhaust efficiency of smoke inlets in each group and the smoke extraction system under the lateral centralized smoke exhaust mode by temperature and CO concentration. FDS is used to investigate the temperature and CO concentration changes under different exhaust volumes, and the heat and smoke exhaust efficiency are obtained. The larger the exhaust volume, the higher the total heat and smoke exhaust efficiency of the smoke extraction system. However, the phenomenon of plug-holing occurs in the lower left area of the smoke inlets. With the heat release rate of 20 MW and no longitudinal ventilation, the smoke exhaust performance can be greatly improved when the single-sided exhaust volume is 180 m3/s, the heat and smoke exhaust efficiency at the smoke inlets can reach up to 54.2% and 47.3% respectively, and the total heat and total smoke exhaust efficiency are 51.3% and 39.7% respectively.
关键词：Tunnel fire Lateral centralized smoke exhaust mode Transfer mechanism Heat exhaust efficiency Smoke exhaust efficiency Exhaust volume