PROMISING WAYS OF INCREASING OF EFFICIENCY OF FANS OF LOCAL VENTILATION
Based on the analysis of the state of construction of mine fans, a promising way to improve the aerodynamic loading of adaptability and local ventilation fans is proposed. The method of calculating direct-flow radial-vortex aerodynamic design with vortex chamber, forming a high-energy circulation flow was developed. Using the theory of residues, conformal mapping method and equations of Schwarz-Christoffel, the formula for calculating circulation on profiles with circular grating of profiles with vortex sources in the corners was obtained. It was found that the vortex sources eliminate the branching of the flow in the corner points of the profile, that is, they provide a smooth flow, which significantly improves the aerodynamic loading and governing of the fans, enabling to implement the relevant itask of increasing the economic efficiency of mining enterprises.