Numerical study of the effect of blockage on critical velocity and backlayering length in longitudinally ventilated tunnel fires

2015 ◽  
Vol 48 ◽  
pp. 147-155 ◽  
Author(s):  
Soufien Gannouni ◽  
Rejeb Ben Maad
Keyword(s):  
Critical Velocity ◽  
Numerical Study ◽  
Tunnel Fires

Smoke Control in Subway Tunnel Fires

2014 ◽  
Vol 638-640 ◽  
pp. 2027-2030
Author(s):  
Xiao Xiong Zha ◽  
Sheng Zeng ◽  
Yi Yan Chen ◽  
Rui Juan Jiang
Keyword(s):  
Computer Simulation ◽  
Theoretical Analysis ◽  
Critical Velocity ◽  
Simple Formula ◽  
Control Mode ◽  
Subway Tunnel ◽  
Smoke Control ◽  
Release Rates ◽  
Tunnel Fires ◽  
Ventilation Velocity

This paper concerns the smoke control modes and the critical ventilation velocity when the subway tunnel on fires. The standard for the smoke control mode is making sure the smoke exhausting in the shortest way. The critical ventilation velocity means it is just sufficient to prevent the smoke spreading upstream. The critical velocity in different heat release rates obtained though theoretical analysis and computer simulation. In the end, a simple formula to calculate the critical velocity can be fitting out.

scholarly journals Numerical Study of Large-Scale Fire in Makkah’s King Abdulaziz Road Tunnel

Fluids ◽  
2021 ◽  
Vol 7 (1) ◽  
pp. 5
Author(s):  
Kamel Guedri ◽  
Abdullah A. Abdoon ◽  
Omar S. Bagabar ◽  
Mowffaq Oreijah ◽  
Abdessattar Bouzid ◽  
...  
Keyword(s):  
Large Scale ◽  
Unit Area ◽  
Numerical Study ◽  
Human Life ◽  
Gas Temperature ◽  
Road Tunnel ◽  
Air Velocity ◽  
Fire Dynamics ◽  
Tunnel Fires ◽  
Heat Released

Tunnel fires are one of the most dangerous catastrophic events that endanger human life. They cause damage to infrastructure because of the limited space in the tunnel, lack of escape facilities, and difficulty that intervention forces have in reaching the fire position, especially in highly crowded areas, such as Makkah in the Hajj season. Unfortunately, performing experimental tests on tunnel fire safety is particularly challenging because of the prohibitive cost, limited possibilities, and losses that these tests can cause. Therefore, large-scale modeling, using fire dynamic simulation, is one of the best techniques used to limit these costs and losses. In the present work, a fire scenario in the Makkah’s King Abdulaziz Road tunnel was analyzed using the Fire Dynamics Simulator (FDS). The effects of the heat released per unit area, soot yield, and CO yield on the gas temperature, radiation, concentrations of the oxygen and combustion products CO and CO2, and air velocity were examined. The results showed that the radiation increased with the heat released per unit area and the soot yield affected all parameters, except the oxygen concentration and air velocity. The CO yield significantly affects CO concentration, and its influence on the other studied parameters is negligible. Moreover, based on the validation part, the results proved that FDS have limitations in tunnel fires, which impact the smoke layer calculation at the upstream zone of the fire. Therefore, the users or researchers should carefully be concerned about these weaknesses when using FDS to simulate tunnel fires. Further comprehensive research is crucial, as tunnel fires have severe impacts on various aspects of people’s lives.

A Numerical Study of Tunnel Fires

1984 ◽  
Vol 37 (3-4) ◽  
pp. 153-169 ◽  
Author(s):  
J. A. Caton ◽  
J. B. Heywood ◽  
J. V. Mendillo
Keyword(s):  
Numerical Study ◽  
Tunnel Fires

A numerical study of water mist mitigation of tunnel fires

2009 ◽  
Vol 44 (2) ◽  
pp. 198-211 ◽  
Author(s):  
F. Nmira ◽  
J.L. Consalvi ◽  
A. Kaiss ◽  
A.C. Fernandez-Pello ◽  
B. Porterie
Keyword(s):  
Numerical Study ◽  
Water Mist ◽  
Tunnel Fires
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