Vibration and flow characteristics near cavitation occurrence in mixed-flow pump

Yang, Hyeon-Mo; Lee, K Y; Kim, J H; Choi, Yeong Suk

doi:10.1088/1755-1315/240/6/062032

Cited by 4 publications

(3 citation statements)

References 5 publications

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“…60 Moreover, the experimental results on the vibration characteristics in the cavitation state for type B of this study were already reported as a previous paper. 61 A 3-axis accelerometer was used to measure the magnitude of vibration in the cavitation state. From their results, the vibration increased slightly as the inlet pressure decreased and then contained a significant magnitude near the 3% head drop point.…”

Section: Pressure Fluctuationmentioning

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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Section: Pressure Fluctuationmentioning

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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show abstract

“…This method demonstrates high feasibility in noise prediction and noise reduction for hydraulic machinery (Kato et al, 2005). Some scholars have studied the cavitation phenomenon inside mixed-flow pumps, exploring the pressure fluctuation and vibration characteristics in the flow channels through calculations, providing guidance for stable and low-noise operation of mixed-flow pumps (Yang et al, 2019). Numerical calculations can also be used for optimization design work.…”

Section: Introductionmentioning

confidence: 98%

“…, 2005). Some scholars have studied the cavitation phenomenon inside mixed-flow pumps, exploring the pressure fluctuation and vibration characteristics in the flow channels through calculations, providing guidance for stable and low-noise operation of mixed-flow pumps (Yang et al. , 2019).…”

Section: Introductionmentioning

confidence: 99%

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Zhang,

Wang,

Yang

et al. 2024

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PurposeThis study aims to investigate the noise-inducing characteristics during the start-up process of a mixed-flow pump and the impact of different start-up schemes on pump noise.Design/methodology/approachThis study conducted numerical simulations on the mixed-flow pump under different start-up schemes and investigated the flow characteristics and noise distribution under these schemes.FindingsThe results reveal that the dipole noise is mainly caused by pressure fluctuations, while the quadrupole noise is mainly generated by the generation, development and breakdown of vortices. Additionally, the noise evolution characteristics during the start-up process of the mixed-flow pump can be divided into the initial stage, stable growth stage, impulse stage and stable operation stage.Originality/valueThe findings of this study can provide a theoretical basis for the selection of start-up schemes for mixed-flow pumps, reducing flow noise and improving the operational stability of mixed-flow pumps.

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Experimental studies of cavitation evolution through a butterfly valve at different regulation conditions

Zhang,

et al. 2023

Exp Fluids

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Vibration and flow characteristics near cavitation occurrence in mixed-flow pump

Cited by 4 publications

References 5 publications

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

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

Investigation on the flow and induced-noise mechanism during the transient start-up process of a mixed-flow pump

Experimental studies of cavitation evolution through a butterfly valve at different regulation conditions

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