Justification of geometric parameters of the ground pump impeller

Abstract

The use of an axial pump as a back-up pump in a ground pump complex of a dredger is expedient and effective, and various impellers, including profiled ones, are used as a working body. The experience of using an axial pump with profiled blades shows that at the initial stage of operation, high efficiency is ensured, which later tends to decrease sharply due to their inevitable wear. The proposed constant-pitch screw impeller has a simplified geometry, being technologically advanced in manufacturing and, importantly, repair, and with a lower efficiency can retain its value for a long period of operation. Tests of such pumps’ models have allowed us to form their characteristics, but in order to obtain the optimal value of efficiency and pressure at the required supply, it is necessary to analyze competing factors and determine their values. Such factors affecting the optimization parameter include the diameters of the impeller and sleeve, the angles of blade installation, and the density of the grate at various radii of the impeller.