Abstract
The article gives the main results of the study of the dynamics of wear of the working bodies of irrigation pumps, gives the main recommendations as a result of the study of pumping units in the presence of cavitation. The authors consider the cavitation coefficient as the minimum value of this expression, at which the beginning of cavitation is detected. The process of unsteady cavitation is accompanied by many significant effects in which the water flow becomes two-phase, with a corresponding change in its properties, which affects the pump's efficiency. The effect of particle size on the erosion rate is predominant only up to a certain size limit, i.e., 600-800 microns on the blades. After that, the erosion rate increases with a comparatively slower rate. This indicates that the particle size affects the erosion rate only up to a certain particle size.
Highlights
A feature of agriculture in the Republics of Central Asia is the widespread development of machine irrigation
The experiments have been conducted on the steels, and it is found that the erosion rate decrease with increasing hardness by heat treatment of the steels
Centrifugal and axial pumps used for pumping stations (PS) irrigation systems do not consider the specific requirements of irrigation PS, motivating them to be designed for pumping clean water
Summary
A feature of agriculture in the Republics of Central Asia is the widespread development of machine irrigation. By 2021, the capacity of the main pumping and power equipment that has spent the park (factory) resource amounted to more than 70% of installed capacity at pumping stations (PS). The definition of "limiting" elements of pump assemblies in changing operating conditions is an extremely urgent task at the beginning of the XXI century. Long-term operation of worn-out equipment in the conditions of tougher operating conditions leads to accelerated physical deterioration of pump components (impeller, impeller chamber, bearings), the main components, the restoration of which requires complete disassembly with decommissioning for a long period. The weighted average efficiency of the equipment is reduced, technical and economic characteristics are deteriorating
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