Ventilation control in case of a fire is a very important issue in tunnel safety. In general an automatic system is employed in order to control smoke movement inside the tunnel. The major control parameter is the air velocity upstream the fire location. Depending on the ventilation philosophy critical or low air velocity philosophy might be applied. In both cases a proper measurement of the air speed is required. The control itself is performed by a PID or PID like controller, which triggers fan operations and uses the measured value of the air or smoke speed as feedback value. The best solution would be having a measurement of the upstream situation, i.e. far away from any influence of the fire. However, there exist always locations inside the tunnel, for which this ideal conditions are not possible. This paper deals with situations, where velocity information has to be taken from monitoring locations downstream the fire. Numerical simulations for wind distributions in a cross section for different heat release rates are performed and compared to measurements. The numerical simulations are performed with the FDS code.


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    Titel :

    Influence of fires on - air velocity measurements at downstream measurement locations


    Beteiligte:
    Rafiei, M. (Autor:in) / Sturm, P.J. (Autor:in)


    Erscheinungsdatum :

    2014


    Format / Umfang :

    8 Seiten, Bilder, 3 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch