Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pressure modelling of char-forming and laminated materials
The pressure modeling technique is used to study upward fire spread on fuel wall composed of char-forming or laminated materials. Time-resolved measurements are obtained at one-atmosphere (full-scale) and at elevated air pressure (model scales) to characterize fire growth in terms of rate of total mass loss, flame height, upward flame spread rate, and maximum lateral flame dimensions during the spread process. The char-forming materials (pine-wood, particular-board and a rigid, polyurethane foam) are tested in a 90 deg. wall-corner configuration while the laminated materials (PMMA) in combination with PMMA or ceramic backings) are tested in a wall configuration. Thermally-thick PMMA is tested in both configurations for purposes of comparison. Results are generally consistent with the pressure modelling scheme and a series of one-dimensional transient thermal conduction and pyrolysis calculations. The behavior of the rigid polyurethane foam, however, is an exception. This 1aterial does not support self-sustained upward flame spread at one-atmosphere when exposed to flames from a 0.1 m high PMMA ignition source but does not support rapid fire growth at elevated pressures. A possible reason for the anomalous polyurethane behavior is the intumescent structure of the hot char at one-atmosphere, but a better understanding of the mechanism of upward or wind-aided flame spread on charring materials is needed to resolve the issue.
Pressure modelling of char-forming and laminated materials
The pressure modeling technique is used to study upward fire spread on fuel wall composed of char-forming or laminated materials. Time-resolved measurements are obtained at one-atmosphere (full-scale) and at elevated air pressure (model scales) to characterize fire growth in terms of rate of total mass loss, flame height, upward flame spread rate, and maximum lateral flame dimensions during the spread process. The char-forming materials (pine-wood, particular-board and a rigid, polyurethane foam) are tested in a 90 deg. wall-corner configuration while the laminated materials (PMMA) in combination with PMMA or ceramic backings) are tested in a wall configuration. Thermally-thick PMMA is tested in both configurations for purposes of comparison. Results are generally consistent with the pressure modelling scheme and a series of one-dimensional transient thermal conduction and pyrolysis calculations. The behavior of the rigid polyurethane foam, however, is an exception. This 1aterial does not support self-sustained upward flame spread at one-atmosphere when exposed to flames from a 0.1 m high PMMA ignition source but does not support rapid fire growth at elevated pressures. A possible reason for the anomalous polyurethane behavior is the intumescent structure of the hot char at one-atmosphere, but a better understanding of the mechanism of upward or wind-aided flame spread on charring materials is needed to resolve the issue.
Pressure modelling of char-forming and laminated materials
Druckmodell von kohlebildenden Stoffen und Schichtwerkstoffen in Brandfaellen
Alpert, R.L. (Autor:in)
US Government Reports ; 1-114
1983
114 Seiten
Report
Englisch
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