Numerical Simulation of Internal Fire Whirls in an Inclined Shaft

Yan Huo; Ye Gao; De Xiang Huang

doi:10.4028/www.scientific.net/AMR.732-733.254

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 732-733Numerical Simulation of Internal Fire Whirls in an...

Numerical Simulation of Internal Fire Whirls in an Inclined Shaft

Abstract:

In order to understand the characteristics of fire whirls in the inclined shaft with corner gap, large eddy simulations (LES) of thermal flow field in a 9-meter-high inclined shaft were employed. In the inclined shaft, the conrner gap is 0.3m and 0.7m in width, and the inclination angle is 5°, 30°, 45°, 50° and 55° from the vertical orientation axes respectively. It is found that a whirling flow field could be formed under proper inclination angles and corner gap width. Rotational axis of fire whirls in the inclined shaft would have same inclination angles with the shaft. Similar to the case of fire whirls in a vertical shaft, the width of corner gap of inclined shaft also influences the whirling motion of the flame. In this paper, for the same fire and inclination angle, the 0.3-meter-wide corner gap is easier to form stable fire whirls than the 0.7-meter-wide corner gap. By comparison with buoyancy, the slightly greater Coriolis force was found above a height 3m for inclined fire whirls when the width of croner gap is 0.3m, however, the Coriolis force acts only on the lower part of the shaft when the width of croner gap is 0.7m.

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Periodical:

Advanced Materials Research (Volumes 732-733)

Pages:

254-257

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.732-733.254

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Online since:

August 2013

Authors:

Yan Huo, Ye Gao, De Xiang Huang

Keywords:

Fire Whirls, Inclined Shaft, Thermal Flow Field

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