Erosion processes during non-stationary cavitation of irrigation pumps

Dzhurabekov, A; Rustamov, Sh.; Nasyrova, N; Rashidov, Jaloliddin

doi:10.1051/e3sconf/202126403016

Cited by 7 publications

(3 citation statements)

References 28 publications

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“…A backward-bent vane has a large radial vane force, which radial vane impellers do not have. Eckardt [20], Young [21], and Fischer and Thoma [22] reported water separations in backward inclined impellers. In Eckardt's work, at the outlet of the impeller β = 60°.…”

Section: Resultsmentioning

confidence: 99%

Improving impeller and water flow section of vane pumps

et al. 2023

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As a result of the research, it was found that the blades of the working impellers of the pumps are eroded at the inlet and outlet. Based on software studies, the points of erosion caused by cavitation and sand particles at the entrance of the impeller and the points of operation of the impeller under heavy load have been determined. The operating points under heavy load are compared with working impellers in nature. After comparison with software developments, it is determined that they are compatible with working impellers in natural conditions. The following impeller model is recommended to reduce cavitation and erosion processes in the impeller (Figures. 6, 10). The recommended impeller is shown in the inlet of the impeller to free water entry, prevent water shortage, and reduce the level of cavitation. (Figures 6, 10, 11). The ingress of water into the impeller is freed, the continuous movement of water is restored, and the methods of preventing the processes of decay and holes formed in the impeller are given. Recommended methods of significantly reducing the level of wear in the input and output parts of the impeller are given.

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Section: Resultsmentioning

confidence: 99%

Improving impeller and water flow section of vane pumps

et al. 2023

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“…For the service water supply system, centrifugal pumps of types K, KM, and D are used or, with special justification, vertical submersible pumps [7,8]. The number of pumps must be at least two (one of them is redundant with automatic switching) for a centralized or group scheme.…”

Section: Fig 3 Electric Motor Technical Support Pipelines (Oil Supply...mentioning

confidence: 99%

Elements of technical water supply system of pumping units

Ergashev,

Rashidov,

Musaev

et al. 2023

E3S Web of Conf.

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The ongoing research aims to develop an optimal variant of the industrial water supply scheme, selected based on a comparison of several possible solutions. It is recommended to use a block-by-aggregate technical water supply system at stations equipped with any number of main units with a large flow of the main pumps, more than 5 m3/s. If there is a significant amount of sediment in the water at the stations, settling tanks are needed at the water intake devices of the technical water supply systems. Filling with water from pumps installed above the source level can be performed using vacuum pumps, ejectors, the self-suction method, using suction pipes with a raised elbow, or storage tanks. The authors investigated a new process water supply system for a large pumping station in Kiziltepa with control devices and a flow meter on the service water supply inlet pipeline. The calculation of the reliability of the operation of the described structures includes a new reliability criterion, which is taken as the turbidity of the flow at the outlet of the settler.

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“…Cavitation can also lead to cavitation erosion, which is a form of wear and tear that can be harmful to pumps. Cavitation erosion occurs when vapor bubbles form in places where the pressure decreases, and then rapidly collapse when they pass into a high-pressure zone, causing damage to the pump surfaces (Dzhurabekov et al, 2021). This phenomenon occurs when the absolute pressure of the liquid moving in the pump falls below the vaporisation pressure of that liquid at a constant temperature, leading to the formation of vapour bubbles.…”

Section: Introductionmentioning

confidence: 99%

Machine Learning-Based Prediction of NPSH, Noise, and Vibration Levels in Radial Pumps Under Cavitation Conditions

ORHAN,

KURT,

KIRILMAZ

et al. 2024

Tekirdağ Ziraat Fakültesi Dergisi

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Cavitation, a physical phenomenon that detrimentally affects pump performance and reduces pump life, can cause wear on pump elements. Various engineering methods have been developed to identify the initiation and full development of the cavitation process. One such method is the determination of the net positive suction head (NPSH) through a 3% decrease in total head (Hm) at a constant flow rate. In radial pumps, commonly used in agricultural irrigation and industry, cavitation conditions result in a sudden drop in the Hm-Q curve, making it challenging to detect the 3% Hm value drop. This study differs from others in the literature by modelling NPSH, noise, and vibration levels using three machine learning models, specifically artificial neural networks (ANN), support vector machines (SVM), and decision tree regression (DTR). The best-performing model predicts NPSH, noise, and vibration levels corresponding to a 3% decrease in Hm level. The present study determined the NPSH values of a horizontal shaft centrifugal pump at different flow rates and constant operating speed, and the vibration and noise levels were measured for these NPSH values. For each of the NPSH, noise, and vibration levels, ANN, SVM and DTR models were created. The performances of these models were evaluated using criteria such as root mean squared error (RMSE), Mean Absolute Error (MAE) and mean absolute percentage error (MAPE). In addition, Taylor and error box diagrams were created. The ANN model and DTR yielded high accuracy predictions for NPSH values (R2 = 0.86 and R2 = 0.8, respectively). The ANN model provided the best prediction performance for noise and vibration levels. By entering the level of 3% drop in the Hm value of the pump as external data input to the ANN model, NPSH3, noise, and vibration levels were determined. The ANN models can be effectively employed to determine NPSH3, noise, and vibration levels, particularly in radial flow pumps, where detecting 3% reductions in manometric height value is challenging.

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Erosion processes during non-stationary cavitation of irrigation pumps

Cited by 7 publications

References 28 publications

Improving impeller and water flow section of vane pumps

Improving impeller and water flow section of vane pumps

Elements of technical water supply system of pumping units

Machine Learning-Based Prediction of NPSH, Noise, and Vibration Levels in Radial Pumps Under Cavitation Conditions

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