Cavitation in centrifugal pump with rotating walls of axial inlet device

Moloshnyi, O.; Sotnyk, Mykola Ivanovych

doi:10.1088/1757-899x/233/1/012007

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Its intensity decreases, when decreasing the flow rate, which could be explained by the reduction in the axial component of the absolute velocity. This phenomenon is described in more detail at the publication [14].…”

Section: Resultsmentioning

confidence: 90%

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Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

Moloshnyi¹,

Szulc²,

Sotnyk³

2019

JES

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The paper is devoted to the analysis of the cavitation processes in the flow section of the low specific speed centrifugal pump. A new conception of double-entry hermetic pump leads to the application of special shaped inlet device, which is a part of an electrical motor rotating element. Four flow geometrical models of the axial inlet device were taken into consideration. The first model, treated as referential and basic, has a cylindrical shape with small diffuser and a cone in front on the impeller. Other three models consist of the motionless cone, which was part of the housing, straight pipe, and diffuser section rotating analogously to the impeller and a spherical fairing. The research was conducted using physical experiments and numerical simulations of the workflow in the ANSYS CFX software environment. The analysis of the results shows that the pump with the basic model of the inlet device has NPSH 3 % above the average values. The comparison between CFD and experiment of the cavitation curves shape showed its similarity but determined by means of the physical experiment have higher values. Cavitation in the impeller starts earlier than in the axial inlet device. The zones of the cavitation in the axial inlet device are located after the cone, at the beginning of the diffuser section and near the fairing at the outlet of the diffuser section. The cavitation zone, which is located after the cone, is separated from the walls of the axial inlet device. The value of the NPSH 3 % increases, when the diameter of the axial inlet device decreases, as the result of the raise of head loses in the inlet structure.

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Section: Resultsmentioning

confidence: 90%

“…Moloshnyi et. al [14] analyzed the cavitation processes in a pump with the similar shape of inlet device and found the cavitation zone in the diffuser. Using the sudden expansion at the outlet of the diffuser decreases their area.…”

Section: Literature Reviewmentioning

confidence: 99%

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

Moloshnyi¹,

Szulc²,

Sotnyk³

2019

JES

View full text Add to dashboard Cite

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“…Because the mathematical model of processes occurring in agricultural substrates disintegration is poorly described in the literature, an analogous example of cavitation in pumps can be mentioned [38]. The example of the computational fluid dynamics (CFD) model of processes occurring in the centrifugal pump is described in [39]. This study involving cavitation modelling implemented the Rayleigh-Plesset equation.…”

Section: Mathematical Modelmentioning

confidence: 99%

Innovative Hydrodynamic Disintegrator Adjusted to Agricultural Substrates Pre-treatment Aimed at Methane Production Intensification—CFD Modelling and Batch Tests

et al. 2020

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The study objective was to adjust the hydrodynamic disintegrator dedicated to sewage sludge pre-treatment (HDS) to work with agricultural substrate. This involved the development and implementation of a mathematical model of flow via the device’s domain. An innovative disintegrator (HAD—hydrodynamic disintegrator for agriculture) was designed, built, and tested based on the obtained results. The main improvements to the HDS include the implementation of shredding knives in order to overcome clogging by crushed substrate, and the application of ribs in the recirculation zone, contributing to the development of an additional structure damage zone. The challenge of this study was also to determine the operating parameters of the HDA that would provide for an increase in methane production with positive energy balance. The testing procedures, for which maize silage was selected, involved batch disintegration tests and biochemical methane potential tests. No clogging of rotor or spontaneous shutting off of the device, in other words, problems that had occurred in the HDS, were observed. The applied pre-treatment method permitted an increase in the methane potential of maize silage by 34.4%, 27.0%, and 21.6%, respectively for samples disintegrated at energy densities of 10 kJ/L, 20 kJ/L, and 35 kJ/L with net energy profit.

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Optimal design of vortex chamber pump

Rogovyi

Korohodskyi

Khovanskyi

et al. 2021

J. Phys.: Conf. Ser.

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The difficult operating conditions during the pumping of abrasive solid mediums lead to the rapid wear of the mechanical parts of the pumps. The use of jet pumps can significantly increase the reliability and durability of pumping equipment. However, direct-flow jet pumps have low efficiency. The use of the centrifugal force led to the creation of new jet pumps - vortex chamber pumps. Their performance indicators are better than direct-flow jet pump ones. The geometric parameters of the flow channel of the vortex chamber pumps were optimized. The study was carried out experimentally and numerically. Numerical simulation is based on solving the RANS equations with the shear stress transport turbulence model. The geometrical dimensions of the vortex chamber pump with the best performance indicators such as pressure and flow are found. The maximum achievable operating parameters of the vortex chamber pump are analyzed. The comparison of simulation results with experimental data is made.

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Cavitation in centrifugal pump with rotating walls of axial inlet device

Cited by 4 publications

References 4 publications

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

Influence of an Inlet Rotating Axial Device on the Cavitation Processes in a Low Specific Speed Centrifugal Pump

Innovative Hydrodynamic Disintegrator Adjusted to Agricultural Substrates Pre-treatment Aimed at Methane Production Intensification—CFD Modelling and Batch Tests

Optimal design of vortex chamber pump

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