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Characterization of flame radiosity in shrubland firesAuthor(s): Miguel G. Cruz; Bret W. Butler; Domingos X. Viegas; Pedro Palheiro
Source: Combustion and Flame. 158: 1970-1976.
Publication Series: Scientific Journal (JRNL)
Station: Rocky Mountain Research Station
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DescriptionThe present study is aimed at quantifying the flame radiosity vertical profile and gas temperature in moderate to high intensity spreading fires in shrubland fuels. We report on the results from 11 experimental fires conducted over a range of fire rate of spread and frontal fire intensity varying respectively between 0.04-0.35ms-1 and 468-14,973kWm-1. Flame radiosity, or radiant emissive power, and gas temperatures were measured with narrow angle radiometers and fine wire thermocouples located at three different heights in the flames, 0.6, 1.1 and 1.6m above ground. Measured peak radiosity within the visual flame region (reaction zone and free flame) varied between 41 and 176kWm-2. Measurements within the intermittent flame region above the visually estimated average flame height varied between 10 and 30kWm-2. The flame vertical radiometric profile was characterized by a uniform area within the reaction zone and lower free flame, and a decrease in radiosity with height as the measurements approach the flame tip.
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CitationCruz, Miguel G.; Butler, Bret W.; Viegas, Domingos X.; Palheiro, Pedro. 2011. Characterization of flame radiosity in shrubland fires. Combustion and Flame. 158: 1970-1976.
Keywordsfire behaviour, fire spread, experimental fire, flame radiation, flame temperature
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