Conclusions
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1.
Guide-vane units of the types tested can increase the throw of a jet created by a propellerby a factor of 1.3–1.8 for the same drive power. The use of distributor units to untwist the jet is inadvisable for economic and health reasons.
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2.
To analyze a jet untwisted by guide-vane units we can use the equation for untwisted jets with the coefficients α.
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3.
For open-pit ventilators of limited size, it is advisable to get the required throw of the jet by increasing the number of guide vanes in the unit and reducing their width.
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Literature Cited
H. Carslaw and J. Jaeger, The Conduction of Heat in Solids, Oxford University Press (1959).
V. M. Él'terman, Ventilation of Chemical Factories [in Russian], Khimiya, Moscow (1971).
Additional information
Institute of Physics of the Earth, Academy of Sciences of the USSR. All-Union Scientific-Research Institute of Transport Construction, Moscow. Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 2, pp. 110–113, March–April, 1974.
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Airuni, A.T., Skobunov, V.V. Turbulent diffusion of impurities from moving sources in underground workings. Soviet Mining Science 10, 218–221 (1974). https://doi.org/10.1007/BF02501822
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DOI: https://doi.org/10.1007/BF02501822