Numerical calculation of the boundaries of vortex zones at the entrance to round suction tubes with three shelves

Abstract

The article proposes to reduce the size of the vortex zones (VZ) formed when the flow is separated from the sharp edges, due to the formation of three fractures of the round suction socket. The lengths of the first and third bell shelves in the range of 0,1‒0,5 caliber (the radius of the suction pipe) correspond to the angles of their inclination, at which the lengths of the vortex zones are equal to the lengths of these shelves. Calculations were performed for the angles of inclination of the second shelf of the bell 30, 60 and 90 with lengths from 1, 2 and 5 calibers. The boundaries of vortex zones for the specified sizes are found, analytical dependences for their determination are proposed. Profiling according to these boundaries will eliminate the formation of vortices and reduce the coefficient of local resistance at the entrance to the bell.