Influence of Moving Vehicles on Temperature Distribution of Tunnel Fire Ceiling Jet

doi:10.12068/j.issn.1005-3026.2020.05.008

Abstract

Abstract: Taking the scene of car fire and bus driving through fire source in highway tunnel as an example， a fire calculation model was established based on a tunnel project， and the dynamic influence law of vehicle motion speed on temperature distribution of tunnel fire was studied by using overset mesh technology and fire numerical simulation method. The results show that when the vehicle passes through the fire source at the speed of 11.11m/s， the smoke temperature at the top of the cross and longitudinal sections of the fire source is the lowest. When the influence of vehicle-induced airflow on the temperature distribution reaches the maximum， the cross sectional smoke temperature from the ignition lane to the vehicle passing through the lane shows a pattern of first decrease and then increase.In the range of 15m upstream of the highest temperature point， the longitudinal smoke temperature decays steadily， and the decay rate reaches maximum when the vehicle speed is 11.11m/s.

Key words: tunnel fire, moving vehicle, ceiling jet, temperature distribution, numerical simulation

CLC Number:

U458.1

LIU Bin， MAO Jun， LI Gui-qiang， XI Yan-hong. Influence of Moving Vehicles on Temperature Distribution of Tunnel Fire Ceiling Jet[J]. Journal of Northeastern University Natural Science, 2020, 41(5): 655-661.

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