Control of Ventilation Airflow for Tunnel Fire Safety
作者:
H. XUE,
T.C. CHEW,
K.L. TAY,
Y.M. CHENG,
期刊:
Combustion Science and Technology
(Taylor Available online 2000)
卷期:
Volume 152,
issue 1
页码: 179-196
ISSN:0010-2202
年代: 2000
DOI:10.1080/00102200008952133
出版商: Taylor & Francis Group
关键词: Tunnel;fire;smoke movement;ventilation;reverse flow
数据来源: Taylor
摘要:
Behavior of fire-induced heat and smoke movement in a longitudinally ventilated model tunnel is studied experimentally. A gas burner is used as fire source. Ventilation velocity, heal release rate, temperature distributions arc measured under quasi-steady conditions. Flow visualization using incense smoke as a tracer has been carried out to identify some important characteristics of the flow and heat transfer, such as the upstream layer, thermal stratification, turbulence mixing, etc. Flow patterns under different ventilation velocities are analyzed and discussed. It is found that heat and smoke can be controlled by proper ventilation. Optimum environment for initial evacuation and fire services should be provided at a ventilation velocity close to or slightly less than the critical ventilation velocity, which is a function of the cube root of the heat release rate. The effects of heat release rates and tunnel inclination angles were also investigated.
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