The aim of the research is to increase the efficiency of pumping stations operation by improving the methods of uniform spreading of the flow from the front chamber and the water intake of the pumping station and the development of constructive measures to improve the hydraulic conditions of the flow supply to the pumps. This goal is achieved by the fact that the device for supplying water to the water intake contains guiding elements. The improvement of the method of hydraulic calculation of the flow in the front chamber and the water intake chamber is carried out on the example of the head pumping station of the Jizzakh cascade. In the process of research, standard methods of full-scale and bench tests of pumps, methods of mathematical and hydraulic modeling, statistical processing of results and the creation of mathematical models based on the laws of hydromechanics were used. The project substantiates the choice of a technical solution to improve the hydraulic structure of the flow in front of the impeller of the pumps of the Jizzakh head pumping station. The authors have developed new technical solutions, including an element for influencing the flow, installed in the water intake chamber of the pumps. This makes it possible to expand the ranges of stable, cavitation-free operation of the pump, to ensure an increase in the reliability of water supply to the pumping station, without resorting to complex and expensive reconstruction measures.

The aim of the authors’ research is to improve the hydraulic conditions for supplying the flow to the impeller and to reduce the cavitation wear of the pump working bodies. This goal is achieved by the fact that the device for supplying liquid at the inlet to the pump contains guide elements in the form of flat plates mounted on the axis of the suction pipe. With further modernization, the pumped liquid was stabilized after the impeller, with the elimination of vortex flows along the entire flow path of the pump due to new elements in the pump chamber. The problem is solved by the design of a straightening blade with a free cross-sectional area of the wall channel less than the inner channel. The research methods include the conduct of field and laboratory studies using modern technical means of observation. Long-term experimental work carried out at large pumping stations investigates interconnected systems of connecting structures and pumps. The stability function is determined as a result of taking into account a number of factors: the external environment, technological properties of systems and operational requirements. The change in the critical, from the point of view of the emergence of cavitation, the value of the pump supply from different densities of the pumped liquids was established as a result of bench tests. In the experiments, the cavitation erosion of the growth was compared with analogs in the average 90-100 times. The ratio of the performance of the surface tension force to the density for mercury and water at a temperature of 15° C turned out to be equal to 91. As a result of the development of a new design together with Joint-Stock Company SUVMASH and the method of calculating the working parts of the pump with a minimum wear rate of the pump with a minimum wear rate of 5%.

The purpose of the research is to substantiate an effective technology for the use of reinforced soil in hydraulic engineering facilities. The main task is to develop calculation methods and compare them with the results of model studies. The article uses methods of physical modeling of structures made of reinforced soil. It develops the theoretical foundations of modeling by introducing the obtained data on full-scale structures. The values of the dimensionless coefficients and the corresponding hydraulic gradients for various times are given in the tabular form, which is convenient for calculating operational parameters. To clarify the change in the boundary of the filtration flow over time, experiments were carried out in a slotted tray. The article graphically depicts the results of theoretical studies and experiments; the discrepancy between the theoretical and experimental curves for changing the boundary of the filtration flow over time is no more than 4%.

The technical task of creating new designs of submersible vane pumps is to maintain stable operating parameters and increase the productivity of the pumping station with periodic regeneration and sediment removal. The pumping well station contains an outer chamber and an inner chamber, in which a pumping unit is installed, and pipelines are connected to the lower and upper pools. In the structure under study, the upper parts of the outer and inner chambers are equipped with a sealed head, and the lower part of the outer chamber is equipped with a stopper. The side surface of the inner chamber is made of elastically deformable material. An elastic pipeline with an ejector at its end with curvilinear helical grooves on the inner surface of the nozzle part of the ejector is connected to the pipeline connected to the tailpipe, and water level meters are installed in the outer chamber. The technique of balance testing of new designs of submersible vane pumps was applied because the existing technology is insufficient for correct balance tests. Research methods involve the design of the impeller, which is rigidly mounted on the shaft. The methodology has been adjusted to apply to multistage pumps with different types of impellers. In the energy balance of this pump, the power losses due to friction in the individual axial support of the impeller are additionally determined. Experimental work was carried out, resulting in measurements of the hydrodynamic moment acting on the guide vane grate. Experimental work was carried out on a vertical stand with new pump impellers ETsV-10-120-40 and with a service life of 1 year. Parametric tests made it possible to determine the change in the external parameters of the pump depending on changes in its operating conditions and network characteristics.

The purpose of the research was to study the hydraulic conditions of the flow supply in the new design of the curved suction pipe and to study the effect of these conditions on the pump operation. Improving the suction pipes provides a predetermined schedule of water supply, reducing unproductive losses and the cost of electricity for water lifting. Therefore, such studies are relevant. The article uses methods of physical modeling with the introduction of the obtained data on full-scale structures. The values of the dimensionless coefficients and the corresponding hydraulic gradients for various times are studied on a suction pipe model at Qmax and Qmin, over the entire range of operating parameters. The chosen method of improving the suction pipes provides an optimal water supply schedule, reducing unproductive losses and electricity costs for water lifting. During the reconstruction of pumping stations, projects for the modernization of water supply facilities were introduced with annual energy efficiency amounting to 1312 million sum for the pumping stations Kuyumazor, Kiziltepa-1 - 105 million sum.