Characteristics of unsteady excitation induced by cavitation in axial-flow oil–gas multiphase pumps

Liu, Xiaobing; Hu, Quanyou; Wang, Huiyan; Jiang, Qifeng; Shi, Guangyuan

doi:10.1177/1687814018771260

Cited by 15 publications

(9 citation statements)

References 15 publications

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“…4 For the suitable cavitation model, the Rayleigh-Plesset equation (RPE) was employed to analyze the two-phase transition. 12,[27][28][29] For a single bubble in an unbounded incompressible liquid, the Rayleigh-Plesset cavitation model, derived from a momentum balance in the absence of thermal effects, is as follows…”

Section: Numerical Analysis Setupmentioning

confidence: 99%

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Kim

Yang

Suh

et al. 2020

Advances in Mechanical Engineering

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In this study, two types of mixed-flow pump models exhibiting different suction performances were investigated to understand the cavitation characteristics of head drop gradients due to the decrease in inlet pressure. Both models were designed with the same specifications except for the shroud inlet blade angle and inlet radius which directly affect the incidence angle. The steady- and unsteady-state analyses were performed using ANSYS CFX, and the results of both models were compared. Bubble generation and patterns were systemically represented at the design flow rate to observe their influence on suction performance. Furthermore, experimental tests were performed to validate the numerical results. From the results, the head drop gradient can determine the suction performance of mixed-flow pumps. The amount and shape of the bubbles concerning the suction performance of a mixed-flow pump exhibit significant differences with the changes in time and inlet pressure. The patterns of generated bubble are not stable even for each blade.

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Section: Numerical Analysis Setupmentioning

confidence: 99%

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Kim

Yang

Suh

et al. 2020

Advances in Mechanical Engineering

View full text Add to dashboard Cite

show abstract

“…As a suitable cavitation model, the Rayleigh-Plesset equation (RPE) was employed to solve the two-phase transition. 8,[36][37][38] For a single cavity generated in an incompressible liquid, the RPE, derived from a momentum balance in the neglect of thermal effects, is as follows:…”

Section: Cavitation Analysismentioning

confidence: 99%

Effect of incidence angle on cavity blockage and flow stability in the net positive suction head drop of mixed-flow pumps

Kim

Lee

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The cavitation is an inevitable factor in pumps used in the whole industry, which is a major cause of energy loss and mechanical breakdown. In this study, the cavitation phenomena at the design flow rate were numerically analyzed for two pumps with different incidence angles. The design flow rate for both models was located near the best efficiency point (BEP). The incidence angle was determined with the impeller inlet diameter and the blade angle. A pump with a smaller incidence angle consistently showed a stable flow pattern as the inlet pressure decreased, whereas a pump with a larger incidence angle contained non-uniform flow streamlines despite a very small amount of the generated cavities. The flow pattern at the impeller inlet was handled by the shape and thickness of the generated cavities which could act as an additional blockage in the pumps. The inception and growth of the cavity with a decrease of inlet pressure were also inferred, which was specifically quantified as the blockage ratio. A pump with a larger incidence angle performed poor cavitation characteristics and obtained the pressure fluctuation and cavity oscillation. The magnitude of pressure fluctuation was indicated using the fast Fourier transform (FFT) analysis. The experimental tests were performed on both pumps to validate the numerical results.

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“…Meanwhile, the centrifugal pump operates an off-design, where the inner flow inside the pump becomes unstable and complex. At the same time, a variety of unstable factors such as cavitation, stator-rotor interaction, rotating stall, and backflow [4,5], lead to poor pumping, suction performances, wild vibration, and noise.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Fluid-Structure Coupling Dynamic Characteristics of Centrifugal Pump Rotor System

Yuan

Shi

et al. 2022

Energies

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Safety and reliable operation is one of the most important research areas for centrifugal pump systems, due to the interaction of complex flow, large structural load, and vibration caused by the operation of the impeller. To analyze the internal flow and impeller deformation of the centrifugal pump, the single-stage single-suction centrifugal pump titled IS100-80-160 was selected as the research object. Under the principle of single variable, the turbulent flow and structural response of three impellers designed by different parameters were calculated by CFX and ANSYS Workbench. A numerical simulation of steady flow at different flow rates of the centrifugal pump was carried out, and its hydraulic performance is consistent with the corresponding experimental results. By comparing the deformation of the impeller rotor system, it was found that the closed impeller has the worst stability with the best hydraulic performance; the impeller with split blades has the worst stability with the best hydraulic performance. This study could enhance the understanding of impeller FSI on centrifugal pump stability and provide a reference for improving the operational stability of centrifugal pumps.

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Characteristics of unsteady excitation induced by cavitation in axial-flow oil–gas multiphase pumps

Cited by 15 publications

References 15 publications

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Numerical study on the cavitation phenomenon for the head drop and unsteady bubble patterns with a difference in the incidence angle of a mixed-flow pump

Effect of incidence angle on cavity blockage and flow stability in the net positive suction head drop of mixed-flow pumps

Analysis of Fluid-Structure Coupling Dynamic Characteristics of Centrifugal Pump Rotor System

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