Air Distribution in Inclined Drifts with Intense Heat Emission Sources
M. D. Popov, M. A. Semin, L. Yu. Levin
Mining Institute, Ural Branch, Russian Academy of Sciences, Perm, Russia
Keywords: Mine ventilation, underground fire, thermal depression, ventilation stability, modeling, ventilation network
Abstract
The authors analyze convection-induced stratification of air flows in an inclined drift with an intense heat emission source. The research methodology included 3D numerical modeling of nonstationary aero-thermodynamic processes in an inclined drift and in an adjoint horizontal drift. The article describes three possible scenarios of convection-induced air flow stratification in an inclined drift depending on heat emission intensity. The dependence of the critical heat rate of the heating source on the initial depression and incline of the drift is determined. The pressure difference-mass air flow relationship in the inclined drift is analyzed at different heat emission intensities using the 3D numerical model and a 1D network model. Description of underground mine fires using 1D models requires empirical relationships of air drag, average air density and air flow rate.
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