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Ignition of wood under time-varying radiant exposures.
- Source :
-
Fire Safety Journal . May2016, Vol. 82, p131-144. 14p. - Publication Year :
- 2016
-
Abstract
- Many studies have utilized a small-scale experimental apparatus such as the cone calorimeter to investigate the piloted ignition of wood exposed to constant levels of incident heat flux; however, there is a deficiency of similar studies related to the non-piloted ignition of wood exposed to time-varying heat fluxes which might represent more realistic fire exposures. In this study, a method was established for producing well-controlled, time-varying exposures using the conical radiant heater of a cone calorimeter. Experiments were conducted in which the incident flux, time to non-piloted ignition, and back-surface temperature of spruce wood were measured. Measured data were used in combination with a numerical heat transfer model to compute the time-dependent temperature distribution through each specimen, and thereby deduce the surface temperature at ignition. From the 30 specimens tested, the average surface temperature for non-piloted ignition of wood was determined to be 521±10 °C. From this surface temperature range, the heat transfer model was used to predict the range of time over which non-piloted ignition was likely to occur for a given time-varying exposure. This procedure was found to produce excellent predictions of ignition time for the time-varying exposures considered in this study. In addition, several existing ignition models were considered, and their suitability for predicting the non-piloted ignition of wood was assessed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03797112
- Volume :
- 82
- Database :
- Academic Search Index
- Journal :
- Fire Safety Journal
- Publication Type :
- Academic Journal
- Accession number :
- 115217196
- Full Text :
- https://doi.org/10.1016/j.firesaf.2016.02.002