Abstract
The article deals with the problems of increasing the energy efficiency of vertical centrifugal pumps, and proposes a method for modifying the impellers. To increase the hydraulic efficiency, the option of replacing the traditional homogeneous paddle screen with a variable pitch heterogeneous screen was considered. To substantiate the expediency of applying the modification option, the theory of shockless flow entry into the impeller is presented and analyzed. To automate the calculations of the parameters of a heterogeneous lattice, a module was created in the PYTON environment. The results of an automated calculation of the parameters of a heterogeneous bladed lattice are presented, and the results of fluid flow simulation in two versions of the wheels are presented