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An Experimental Study on the Effect of Rotation Strength on Fire Whirl Characteristics  

Choi Sang-Yeol (Graduate School of Chung-Ang University)
Ryou Hong-Sun (School of Mechanical Engineering, Chung-Ang University)
Publication Information
Journal of the Korean Society of Safety / v.20, no.2, 2005 , pp. 11-17 More about this Journal
Abstract
Rotational motion in the atmosphere around a fire may have a profound influence on the fire plume. This process underlies the occurrence of fire whirls. Fire whirls are rare but highly destructive phenomenon which were observed in a large forest, urban and building fires. The present study aims to investigate of the effect of rotation Strength on the fire whirl characteristics expeimentally. Experiments are performed for various sizes of fire source with different rotation strength. From the experimental observations, it is noted that the mean centerline temperature is gradually increased and mean radial temperature is decreased as increases rotation strength. The characteristic mean flame height of fire based on the visible observation is increased as increases of dimensionless swirl parameter, $\Omega/\alpha$, represented by swirl induced motion to buoyancy driven motion.
Keywords
fire whirl; rotation strength; characteristic pool diameter; characteristic mean flame height;
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