DETERMINING THE AERODYNAMIC CHARACTERISTIC OF A MINE AXIAL FAN WHEN OPERATING IN REVERSIBLE MODE

Abstract

This paper describes the procedure for determining the approximate aerodynamic characteristics of a fan operating in a reversible mode with the reverse direction of impeller rotation and deployed position of the straightener blades. To calculate the aerodynamic characteristic, the results of computational modeling of the flow around a flat cascade of airfoil blades were used. To check the adequacy of the applied design models, the comparison of flow deflection angles and total pressure losses when flowing around flat cascades composed of NACA65 airfoils in the direct mode and the known experimental data was made. Using the example of a OV-103 fan made according to the design of Central Institute of Aerohydrodynamics, with the known experimentally obtained aerodynamic characteristic of the reversible mode, the angles of reverse flow deflection in a cascade at the middle radius and total pressure loss in it were calculated. The obtained data were used to calculate the values of the coefficient of total fan pressure depending on the flow rate of air flowing through the fan. The obtained characteristics showed the value of maximum air flow rate higher than in the experimental characteristics. But in this case, it is closer to experimentally obtained data than the value calculated from the known theoretical characteristics of flat cascades.