Emergency ventilation in tilted vehicular tunnel

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Emergency ventilation in tilted vehicular tunnel


Author: Lam, Ka Kit
Title: Emergency ventilation in tilted vehicular tunnel
Degree: M.Eng.
Year: 2011
Subject: Tunnels -- Fires and fire prevention.
Emergency ventilation.
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Building Services Engineering
Pages: 110 leaves : col. ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2551459
URI: http://theses.lib.polyu.edu.hk/handle/200/6931
Abstract: This study aims to study the emergency ventilation configuration of transverse ventilation in a tilted vehicular tunnel. From the statistics in Hong Kong, the probabilities of having vehicular tunnel fire is very low. However, the consequence of any fire incidents in tunnel can cause huge damage to property and loss of lives. There is no internationally agreed prescriptive code or design guide on fire and smoke ventilation. The performance based standards for the tunnel ventilation design are of a wide range of values. This dissertation addresses specifically the tunnel emergency ventilation design information. Smoke movement in horizontal (0°) and tilted cases (2.5°,5°,7.5°, 10° in slope) were studied. Experimental studies are performed by a 1:25 scaled-model which is 1.7 m long 0.3 m width and 0.225 m high. The hot gas temperature, smoke movement pattern, transverse ventilation velocity, smoke layer interface height and smoke extraction efficiency at 0° to 10° slope of the tunnel were analysed. The transverse ventilation with constant ventilation flow rate in the vertical shaft was introduced into the tunnel smoke control system. The best performance of the upstream vent is at slope = 10°. The hot gas extraction capability of the downstream vent becomes zero as the slope increased to 5°. Result shows that the transverse ventilation is more effective in tilted tunnel with steeper slope. Effective smoke control requires a complete fire safety management system. The results in this research provide a comprehensive tunnel emergency ventilation design reference for tunnel specialists.

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