Abstract
The article deals with the problems of increasing the energy efficiency of dynamic pumps, and suggests a method for upgrading the impellers. To increase the hydraulic efficiency, the option of replacing the traditional homogeneous vane grille with a heterogeneous grille was considered. To justify the feasibility of using the modification option, the theory of shockless flow entry into the impeller is presented and analyzed. The article presents a calculation algorithm and a flowchart for automating the calculation of the parameters of a wheel with a heterogeneous vane grille, where the initial data were the pump head H, the pump supply Q, and the shaft speed of a centrifugal multi-stage pump n. A feed variation parameter was also proposed for determining the angles of occurrence and the angles of installation of the blades of a heterogeneous grille, which is determined from the condition of the expansion of the feed zone. The results of the automated calculation of the parameters of a heterogeneous vane lattice are presented.