MODELING OF THE HYDRODYNAMIC CHARACTERISTICS OF A REVERSIBLE HYDRAULIC MACHINE

Abstract

The requirements of modern energy systems to load leveling determine the designing and building of pumped storage power stations as the most effective to work in areas of peak load. Successful solution of the problem of creating highly efficient equipment for PSP depends largely on the correct choice of the geometry of the elements of the water passage of the reversible hydraulic machine, which provide the necessary level of its energy characteristics. In this paper, the issues of modeling the hydrodynamic characteristics of bladed systems of a reversible hydraulic machine, which is based on the general use of the averaged swirling flow model and the simplified spatial flow model in the bladeless sections of the water passage, are considered. Formulas that establish the relation between hydrodynamic characteristics and dimensionless complexes, and show the general laws of the interaction of the flow with a runner of the reversible hydraulic machine are reported. The influence of hydrodynamic characteristics of blade systems on the formation of the energy characteristics of a reversible hydraulic machine are considered. Analysis of the hydrodynamic characteristics of individual elements of the water passage allows to analyze their influence on the energy characteristics of a reversible hydraulic machine. The results of this analysis are the basis for solving a wide range of issues that appear during designing a reversible hydraulic machine. In this paper, the numerical studies of the reversible ORO500 hydraulic machine were carried out. The nature of the dependencies, which were given in the paper, confirms the expediency of using dimensionless complexes for calculating and analyzing the energy dependences of a reversible hydraulic machine. The calculated data testify to the determining influence of the hydrodynamic parameters of spatial lattices not only on the parameters of the optimal mode but also on the nature of the dependence of the efficiency and power upon departure from it. The choice of the most effective method depends on the design stage of the water passage and on the task at hand. Refinement of the calculations performed by the method of averaged parameters is possible using programs for the numerical study of the spatial flow.