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Simulation of smoke flow and longitudinal ventilation in tunnel fire
Understanding the characteristics of smoke flow in tunnel fire is very important for tunnel safety. The characteristics of tunnel fire were analyzed. The smoke development in different situations of an engineering example was simulated using commercial CFD software PHOENICS 3.5 by field modeling method. The spreading rules and characteristics of concentration field and temperature field of smoke flow with different longitudinal ventilation speeds were studied, which may provide the theoretical background for evacuation design in tunnel fire. The effective measures of fire rescue and crowd evacuation were also described. With the distance upstream the fire source increasing, the temperature of winds decrease. And the temperature is reduced to a constant when the distance is large enough, so the influences scope of the high temperature is limited. The highest temperature firstly appears in side wall, and then it spreads to the middle of the runnel with time, so it is better for the passengers to evacuate along the midline of the tunnel. The longitudinal ventilation speed of 3 m/s is enough to meet the fire ventilation, which can control smoke back layering and offer air passages for the vehicles and passengers, because there is no smoke back flows under that ventilation speed. The rules of smoke movement from the beginning to the growth can be obtained with transient simulation of the tunnel fire, which can offer theoretical support for the evacuation means and evacuation time.
Simulation of smoke flow and longitudinal ventilation in tunnel fire
Understanding the characteristics of smoke flow in tunnel fire is very important for tunnel safety. The characteristics of tunnel fire were analyzed. The smoke development in different situations of an engineering example was simulated using commercial CFD software PHOENICS 3.5 by field modeling method. The spreading rules and characteristics of concentration field and temperature field of smoke flow with different longitudinal ventilation speeds were studied, which may provide the theoretical background for evacuation design in tunnel fire. The effective measures of fire rescue and crowd evacuation were also described. With the distance upstream the fire source increasing, the temperature of winds decrease. And the temperature is reduced to a constant when the distance is large enough, so the influences scope of the high temperature is limited. The highest temperature firstly appears in side wall, and then it spreads to the middle of the runnel with time, so it is better for the passengers to evacuate along the midline of the tunnel. The longitudinal ventilation speed of 3 m/s is enough to meet the fire ventilation, which can control smoke back layering and offer air passages for the vehicles and passengers, because there is no smoke back flows under that ventilation speed. The rules of smoke movement from the beginning to the growth can be obtained with transient simulation of the tunnel fire, which can offer theoretical support for the evacuation means and evacuation time.
Simulation of smoke flow and longitudinal ventilation in tunnel fire
Simulation der Rauchströmung und der Longitudinalventilation im Tunnelfeuer
Yang, Gao-shang (author) / An, Yong-lin (author) / Peng, Li-min (author) / Zhang, Jin-hua (author)
Transactions of the Nonferrous Metals Society of China ; 16 ; 741-746
2006
6 Seiten, 8 Bilder, 16 Quellen
Article (Journal)
English
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