Summary
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1.
The currents in a confined space containing support pillars display changes in static pressure both along and across the streams, which explains the unusual geometric parameters of the currents.
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2.
The turbulence intensities of the current vary with the height; the curve plotting this change is virtually a parabola, with a minimum in the height range 0.32–0.40 m, and therefore differs essentially from the curve for a confined space without obstacles.
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3.
The elucidation of the very complex laws governing the kinematic parameters of the currents is greatly helped if we employ an essentially new procedure: calculations allowing for the total momentum and local pressure losses.
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4.
Air mobility in the waste is fairly high. Interest attaches to the relation between the turbulence levels of the main and inducing currents.
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Additional information
Mining Institute of the Academy of Sciences of the KazSSR, Alma-Ata. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 108–120, July–August, 1967.
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Radchenko, G.A. Aerodynamic characteristics of currents in a high mining-out area confined by support pillars. Soviet Mining Science 3, 404–413 (1967). https://doi.org/10.1007/BF02497567
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DOI: https://doi.org/10.1007/BF02497567