An urban traffic link tunnel (UTLT) typically consists of a looped main tunnel and several adjoining ramp tunnels. This complex network system creates a high level of fire risk and complicates smoke control. A generic design procedure to control the smoke flow in a UTLT with longitudinal forced ventilation is proposed in this paper with the relevant design criteria. The ventilation network in a UTLT is divided into three characterized regions: smoke discharge branches, smoke-prevention branches upstream of the fire and the smoke-prevention branches downstream of the fire. This conceptual division converts the looped ventilation network into a branched one, where a simple, one-dimensional calculation approach can be used to develop an appropriate ventilation system, and to solve the flow rates for the various branches. The ventilation system in a UTLT was determined using this novel design method, and the resultant flow rates for the key branches were compared to the steady-state solutions for a three-dimensional numerical simulation. The results demonstrate that the method proposed in this paper is a valid and efficient design tool for controlling smoke in UTLTs.


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    Title :

    A method for design of smoke control of urban traffic link tunnel (UTLT) using longitudinal ventilation


    Contributors:
    Du, Tao (author) / Yang, Dong (author) / Peng, Shini (author) / Xiao, Yimin (author)


    Publication date :

    2015


    Size :

    8 Seiten, 33 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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