Cavitation-abrasive wear working collectors of pumps

Glovatsky, Oleg; Ergashev, Rustam; Saparov, Azamat; Berdiev, Mustafo; Shodiev, Bobur

doi:10.1088/1757-899x/869/4/042006

Cited by 16 publications

(11 citation statements)

References 4 publications

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“…We now move on to justify the shape of the working surfaces of the device cover covers. In solving this problem, we proceed from the condition that the time of interaction between the working surface of the cover and the parts of the mouth is minimal [20][21][22][23][24][25][26][27][28][29]. This is due to the fact that, firstly, the sheets are easily moved along the working surface, and secondly, the technological process is carried out with minimal energy consumption.…”

Section: Resultsmentioning

confidence: 99%

“…It is necessary to ensure the geodetic suction height of the water level in the avant-garde to prevent cavitation erosion that occurs on the working blades of the pump unit. In cases where the water is clean and flows at the same flow rate without obstruction, the suction height in the vane chamber can be ensured [3][4][5]. Russian Scientists from the Siberian State Technological University, V.P.…”

Section: Introductionmentioning

confidence: 99%

“…Korpachev and A.I. Perezhilin, studied the causes of water pollution in hydropower plants and recommended that reservoirs should be kept clean, mainly due to leakage of water from the shores [6].…”

Section: Introductionmentioning

confidence: 99%

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The forces acting on the teeth of catching machine

et al. 2021

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Republic of Uzbekistan, pumping stations are used in very difficult conditions. The presence of various particles and effluents in the water has a negative effect on the operating modes of the pumping equipment. Special grilles are installed to prevent the catching devices from entering the advance chamber of the pump station. The shape and length of the device covers are of great importance so that they are caught in front of the grilles and completely cover the accumulated debris. In the article, the laws of mechanics were used to determine the shape and size of the working device of the device for cleaning the effluent flowing into the pump station as water and accumulated in front of the grids. In doing so, the condition of ensuring complete removal of the leaks covered by the device was taken into account. It was argued that the angle γ between the working surfaces and velocities of the covers should be less than 90-φ over its entire working surface in order to fully cover the device shafts. It was found that when the working surface of the device is flat, the time of interaction with the catching device pieces is minimal. Studies and literature have shown that the angle of friction on the working surfaces of the device covers should be φ=20°, the angle between the working surface of the device cover and the rotational speed γ=70°.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The forces acting on the teeth of catching machine

et al. 2021

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“…Their characteristic feature is intense hardening under micro-shock action and the formation of deformation martensite. Observations carried out under the conditions of waterjet deterioration show that alloyed steels are more resistant to suspended sediment than carbon steels [16][17][18][19][20][21][22][23][24]. In this respect, they are preferred, as is the choice of material for parts subject to waterjet erosion.…”

Section: Sh=idem;mentioning

confidence: 99%

Influence of cavitation on pressure pulsation through impeller of large pumps

et al. 2021

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The article provides the main recommendations for studying the processes of cavitation development on the models of pumping units OPV-10-260 and V 20-13/45 with an impeller diameter Dr = 250 mm. The nature of the effect of cavitation depends on forms of pressure pulsation. The purpose of this work is to study abrasive-cavitation erosion of large pumps. The research objectives are to develop a methodology for calculating their operating modes, taking into account the minimum deterioration of working parts. Strongly developed cavitation leads to disruption of regular pulsations and an increase in the swing of the high-frequency component. Investigations of operating mode of pumps with deterioration of elements of flow section were carried out, and the characteristics of materials for the manufacture of hydromechanical equipment for resistance to cavitation deterioration were refined. According to experiments, the influence of pressure on the pressure fluctuation range begins to significantly affect if the pump pressure is less than 5 m. The nature of the effect of cavitation depends on the forms of pressure pulsation. The complexity of composition, high cost of high-alloy steels, and non-ferrous alloys make it irrational to use them in massive parts operating under cavitation-abrasive conditions. It is recommended to use the developed dependencies on machine water elevating systems to reduce deterioration by improving the quality of impeller materials.

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“…As a result, there is intense hydro-abrasive wear of the flow part and the pump's impeller. This leads to an intensive reduction in the main parameters of the pumps and reduces their inter-repair period [6][7][8][9][10][11][12]. Since the centrifugal and axial pumps used at these pumping stations, according to the recommendations of the manufacturers, do not take into account the specific requirements of irrigation pumping stations, and they justify this by the fact that their pumps are designed for pumping clean water [13].…”

Section: Introductionmentioning

confidence: 99%

Hydro-abrasive wear reduction of irrigation pumping units

et al. 2021

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Uzbekistan is one of few countries in the world where more than 50% of the irrigated lands are provided with water by pumping stations. The main water sources are the transboundary rivers, the Amu Darya, and the Syr Darya, which transport a large amount of bedload and suspended sediments. In these water sources, the average annual turbidity is up to 5-7 kg/m3, and the average monthly turbidity reaches 10-12 kg/m3. The content of abrasive particles with the Mohs hardness of 5 and more reaches 50-60% of the total amount of suspension. When these sediments pass through the pumping units, their hydro-abrasive wear is observed; this leads to a change in the main parameters of the pumps. Bedload sediments with the size of more than 1 mm cause the most intensive pumps hydro-abrasive wear. Therefore, in our research, much attention was paid to developing methods to prevent the ingress of bedload sediments into the flow part of pumping units. For this purpose, based on laboratory tests, taking into account the heterogeneity of bottom sediments, the dependence for determining the ridge forms' height was revealed. On the basis of this dependence was developed methods for determining the height of the threshold damless intakes and the height of the inlet of the suction pipe pumping unit relative to the riverbed bottom. The developed methods reduce abrasive wear of pumping units and increase their repair period.

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Cavitation-abrasive wear working collectors of pumps

Cited by 16 publications

References 4 publications

The forces acting on the teeth of catching machine

The forces acting on the teeth of catching machine

Influence of cavitation on pressure pulsation through impeller of large pumps

Hydro-abrasive wear reduction of irrigation pumping units

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