Influence of Tunnel Size on Smoke Layer Thickness in Short Tunnel Fire
In order to study the effect of tunnel size on the thickness of smoke layer in short tunnel fire,the changes of smoke layer thickness in the initial stage of tunnel fire development and the characteristics of smoke movement under different tunnel lengths and widths were analyzed through simulated tunnel fire tests.The results show that:(1)In the early stage of fire development,the longitudi-nal flue gas layer is in a stable state under the same heat release rate,and the increase of heat release rate has no obvious effect on the thickness of flue gas layer.(2)When the tunnel width is constant,the longitudinal thickness of the flue gas layer gradually increases with the increase of the tunnel length,the flue gas temperature gradually decreases,and the flue gas mass flow rate does not change sig-nificantly.(3)When the length of the tunnel is constant,the longitudinal thickness and temperature of the flue gas layer decrease with the increase of the tunnel width,and the mass flow rate of the flue gas increases with the increase of the tunnel width.(4)In tunnel construction,it is recommended to appropriately increase the ventilation speed of the ventilation system,quickly reduce the temperature in the tunnel,and provide conditions for the safe evacuation of trapped personnel.
short tunnelsimulated firethickness of smoke layermass flow rate of flue gas
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