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Smoke poses a great risk to people in a tunnel fire if not controlled effectively, so how to extract smoke out of tunnel is an important issue of tunnel fire protection. In this study, numerical simulation has been carried out to study the influence of smoke damper configuration on point extraction ventilation system of an urban tunnel using FDS 5.5. Six fire scenarios have been simulated with different damper configurations, and simulation results of damper flow rate, visibility and temperature distribution in the tunnel have been analyzed to evaluate the different fire cases. It can be concluded that the damper area has little influence on the fire smoke control when it is large than 3m 2 , but the damper number and damper spacing have much more influence on smoke control of the point extraction ventilation system of this tunnel. [ABSTRACT FROM AUTHOR]

Abstract: An Urban Traffic Link Tunnel (UTLT) is a novel type of underground transportation system consisting of a main tunnel in a loop shape and several linked tunnels. It has a higher level of fire risk compared to other common road tunnels. In this study, numerical and experimental study has been conducted to investigate the smoke control of Wuhan Central Business District (CBD) UTLT. The transient distributions of the smoke spread have been analyzed, and the optimal smoke control strategy for the Wuhan CBD UTLT has been put forward. [Copyright &y& Elsevier]