Analysis of smoke movement in the Hsuehshan tunnel fire

Study of fire in a tunnel is very important for fire safety. Increasing concerns over terrorism put a lot of focus on the fires in tunnels as they are used extensively in mass transit systems all over the world. A lot of experiments have been carried out to study the fire hazard, smoke movement, and the effects of ventilation on fire behavior. In this paper, dynamics of a ventilated tunnel fire have been simulated using Computational Fluid Dynamics (CFD) Software, CFX 5.6, from Ansys Inc. Simulations considers different models of turbulence and radiation heat transfer. Combustion of methane is modeled using the chemical reaction schemes available in the CFX software. Two turbulent models, k–ε and Shear Stress Transport, are considered. Radiant heat exchange between the species is modeled using P1 model available in CFX 5.6. The results of the simulation have highlighted the effects of ventilation on the fire and movement of harmful gases such as carbon monoxide and nitrogen oxide. Comparison of simulated temperature fields and flame shape with the experimental data has shown good agreement.

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Study on the smoke movement characteristics in large scale interchange tunnel fire

International Journal of Ventilation ◽

10.1080/14733315.2019.1693174 ◽

2019 ◽

Vol 19 (3) ◽

pp. 224-232

Author(s):

Tao Li ◽

Longfei Chen ◽

Yuchun Zhang ◽

Weixiang Ma ◽

Chong Yang ◽

...

Keyword(s):

Large Scale ◽

Smoke Movement ◽

Tunnel Fire ◽

Movement Characteristics

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Study on smoke movement with semi-transverse smoke extraction in subway tunnel fire

Hydraulic Engineering ◽

10.1201/b14013-34 ◽

2013 ◽

pp. 195-199 ◽

Cited By ~ 1

Author(s):

Yanyan Lu ◽

Fang Liu ◽

Gang Li ◽

Shujiang Liao

Keyword(s):

Subway Tunnel ◽

Smoke Movement ◽

Tunnel Fire

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The Effect of Longitudinal Ventilation System on Smoke Movement and People’s Evacuation in Tunnel Fire

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/687/1/012142 ◽

2021 ◽

Vol 687 (1) ◽

pp. 012142

Author(s):

Kunhua Xiao ◽

Yuyang Ji

Keyword(s):

Ventilation System ◽

Smoke Movement ◽

Tunnel Fire ◽

Longitudinal Ventilation

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Effects of ambient pressure on the critical velocity and back-layering length in longitudinal ventilated tunnel fire

Indoor and Built Environment ◽

10.1177/1420326x19870313 ◽

2019 ◽

Vol 29 (7) ◽

pp. 1017-1027

Author(s):

Guanfeng Yan ◽

Mingnian Wang ◽

Li Yu ◽

Yuan Tian

Keyword(s):

Heat Release ◽

High Altitude ◽

Critical Velocity ◽

Heat Release Rate ◽

Release Rate ◽

Ambient Pressure ◽

Smoke Movement ◽

Tunnel Fire ◽

Longitudinal Ventilation ◽

High Altitude Area

Nowadays, the critical velocity and back-layering length are the key parameters in longitudinal ventilation design. However, most studies research them at standard air pressure but ambient pressure decreases at high-altitude area and the reduced ambient pressure could affect the smoke movement characteristics in a tunnel fire. In order to investigate the effect of ambient pressure on the velocity and back-layering length in longitudinal ventilated tunnel, theoretical analysis was carried out first and a series of numerical simulation were conducted with varying heat release rate and ambient pressure. Results show that Li’s model is also reliable under various ambient pressures. The critical velocity under various ambient pressures would become larger with an increase in the heat release rate and would remain stable after the heat release rate reaches a certain value. At smaller heat release rate, the length of counterflow would be higher under reduced ambient pressure while it remains the same when the HRR is large. This could provide reference for tunnel ventilation design at high-altitude areas.

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