[1]钟委,刘欣,高子鹤.纵向通风对隧道火灾特性及竖井自然排烟效果研究[J].郑州大学学报(工学版),2020,41(06):46-52.
 Experimental Investigation on The Influence of Longitudinal Ventilation On Tunnel Fire Characteristics and Natural Smoke Exhaust by Shaft[J].Journal of Zhengzhou University (Engineering Science),2020,41(06):46-52.
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纵向通风对隧道火灾特性及竖井自然排烟效果研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
41
期数:
2020年06期
页码:
46-52
栏目:
出版日期:
2020-12-31

文章信息/Info

Title:
Experimental Investigation on The Influence of Longitudinal Ventilation On Tunnel Fire Characteristics and Natural Smoke Exhaust by Shaft
作者:
钟委刘欣高子鹤
文献标志码:
A
摘要:
本文采用1:10小尺寸隧道模型,研究了采用竖井自然排烟的隧道内,纵向通风对隧道内火焰形态、质量损失速率及竖井内温度分布和排烟速度的影响。结果表明:随着竖井高度和纵向风速的改变,在纵向通风和烟囱效应诱发气流的耦合作用下,隧道内火焰向下游倾斜,造成燃料质量损失速率发生变化,进而影响隧道内的烟气输运规律,并最终影响竖井排烟的温度分布和排烟速度。当排烟口下方的烟气层发生吸穿时,竖井内部出现低温区,此时隧道下部的冷空气直接通过竖井排出,大大减弱了竖井的排烟效果,在对烟气层吸穿现象进行分析的基础上,对Hinckley提出的临界吸穿Froude数进行了修正,得到了用于判断纵向通风条件下竖井自然排烟吸穿的临界Froude数为3.2,当Froude数大于3.2为吸穿区,小于3.2为未吸穿区。
Abstract:
In this paper, a 1:10th scale tunnel was adopted to investigate the influence of longitudinal ventilation on the fire behavior in tunnel and the natural smoke exhaust by vertical shaft. Results showed that the flame inclination and the mass loss rate of fire changed with the ventilation velocity and shaft height, which further influenced the temperature distribution and smoke exhaust velocity through the shaft. Once plug-holing occurred, the fresh air in the lower of tunnel would be exhausted through the shaft directly, greatly reducing the smoke exhaust effect. On this basis, the critical Froude number proposed by Hinckley was improved, and the critical Froude number for natural exhaust by shaft under the longitudinal ventilation was determined as 3.2. For Froude number larger than 3.2, plug-holing occurred, while for Froude number smaller than 3.2, there was no plug-holing.
更新日期/Last Update: 2021-02-10