A Simple Method to Improve Smoke Exhaust Effectiveness of a Shallow-buried Urban Tunnel Fire with Natural Ventilation

Fan Chuangang; Chen Jian; Zhou Yang; Li Linjie; Zhang Jiaqing; Fan Minghao; Liu Xiaoping

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A Simple Method to Improve Smoke Exhaust Effectiveness of a Shallow-buried Urban Tunnel Fire with Natural Ventilation

机译：一种简单的方法，提高浅埋城市隧道火灾自然通风的烟雾废气

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摘要

In order to improve the natural ventilation performance of a shallow-buried urban tunnel under the influence of external wind blowing above the shaft, a new method with installing a jet fan downstream of the shaft was proposed and a set of simulations were conducted to validate its effectiveness. The detailed smoke spread characteristics, such as mass flow rate, temperature, and velocity vector, were analyzed together with varying the ambient wind speed above the shaft, the longitudinal wind speed in the tunnel, and the velocity of the jet fan. Results show that under the coupled push effect of the longitudinal wind upstream of the fire and the airflow of jet fan downstream of the shaft, the block effect of the strong ambient wind on the vertical flow of smoke through the shaft can be overcome completely. In the tunnel, almost all the fire-induced smoke is confined between the fire and the shaft, and smoke can only be exhausted from the shaft. The findings can be a reference for tunnel ventilation design.

机译：为了提高浅埋城市隧道的自然通风性能，在轴上吹出外部风的影响下，提出了一种在轴下游安装喷射风扇的新方法，并进行了一组模拟以验证其效力。将详细的烟雾扩散特性（例如质量流量，温度和速度向量）一起分析在轴上的环境风速，隧道中的纵向风速以及喷射风扇的速度。结果表明，在轴下游的纵向风的耦合推动效应下，轴下游的喷射风扇的气流，强大的环境风对通过轴垂直烟雾流动的块效应可以完全克服。在隧道中，几乎所有的火诱导的烟雾都在火和轴之间限制，烟雾只能从轴中排出。调查结果可以是隧道通风设计的参考。

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来源
《Combustion Science and Technology》 |2021年第4期|355-378|共24页
作者
Fan Chuangang; Chen Jian; Zhou Yang; Li Linjie; Zhang Jiaqing; Fan Minghao; Liu Xiaoping;
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作者单位

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China|Hefei Univ Technol Sch Automot & Transportat Engn Hefei Anhui Peoples R China;

Hefei Univ Technol Sch Automot & Transportat Engn Hefei Anhui Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China;

Cent South Univ Sch Civil Engn Changsha Hunan Peoples R China|Chongqing Jiaotong Univ Sch Civil Engn & Architecture Chongqing Peoples R China;

State Grid Anhui Elect Power Res Inst Hefei Anhui Peoples R China;

State Grid Anhui Elect Power Res Inst Hefei Anhui Peoples R China;

Hefei Univ Technol Sch Civil Engn Hefei 230009 Anhui Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类
关键词
Tunnel; shaft; natural ventilation; smoke spread; jet fan; ambient wind;

机译：隧道;轴;自然通风;烟雾扩散;喷射风扇;环境风;

A Simple Method to Improve Smoke Exhaust Effectiveness of a Shallow-buried Urban Tunnel Fire with Natural Ventilation

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