Physical modeling of upward fire spread from a point ignition on vertical fuel walls is investigated with small-scale fuels burned at elevated ambient air pressure. The modelling technique, which preserves the fluid Grashof number of the full-scale fire spread process, is verified in the first part of the study with polymethyl methacrylate (PMAA) fuel. Modeling inaccuracy is shown to occur when thermal radiation from the vaporizing fuel surface is a dominant heat transfer mechanism at full-scale or when an opticaly thick condition is approached in the high-pressure, radiating flame of the small-scale model. A simplified analysis shows that the required correction factor due to thermal radiation effects should be less than 30 percent for upward fire spread on PMMA and a wide range of other fuels if model tests are conducted at absolute air pressured of 20 to 30 atm. This concept is used in the second part of the study to interpret measurements made at elevated pressure of upward fire spread on aircraft cabin materials, which include foams, textiles and solid composites. It is shown that these materials can be conveniently ranked by characteristic rate of upward fire spread in the 20 to 30-atm pressure range of optimum modeling accuracy. (Peters)


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    Titel :

    The role of radiation in pressure modeling of upward fire spread


    Weitere Titelangaben:

    Die Rolle der Strahlung bei der Druckdarstellung der senkrechten Flammenausbreitung


    Beteiligte:
    Alpert, R.L. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    1979


    Format / Umfang :

    11 Seiten, 10 Bilder, 2 Tabellen, 12 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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