Experimental study on hydrodynamic performance of a cavitating centrifugal pump during transient operation

Wu, Dazhuan; Wang, Leqin; Hao, Zongrui; Li, Zhifeng; Bao, Zhejing

doi:10.1007/s12206-009-1217-3

Cited by 40 publications

(14 citation statements)

References 11 publications

(16 reference statements)

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“…In fact, the limit of P s ≅ 8 mH 2 O coincides with the maximum suction lift reported by Stepanoff [1]. A cavitation limit for P s between 8 and 9 mH 2 O has also been observed in centrifugal pumps [11]. Fig.…”

Section: Resultssupporting

confidence: 86%

Maximum suction lift of water jet pumps

Neto

2011

J Mech Sci Technol

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This paper describes an experimental study on water jet pumps with different diameters and nozzle-to-throat area ratios. The results revealed that the area ratio was an important parameter to characterize the maximum suction lift of the jet pumps, while their diameters had a negligible effect. All jet pumps reached the cavitation regime at a suction lift of about 8 mH 2 O. In the non-cavitating region, it was found that the higher the area ratio, the higher the maximum suction lift for the same motive pressure head. However, the lower the area ratio, the higher the resistance to enter the cavitation regime. A dimensionless correlation was obtained for the non-cavitating region to describe the maximum suction lift as a function of a modified Thoma number and the area ratio. Curve fitting of experimental data also provided a dimensionless correlation to predict the onset of cavitation. Finally, applications of the results are presented.

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Section: Resultssupporting

confidence: 86%

Maximum suction lift of water jet pumps

Neto

2011

J Mech Sci Technol

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“…The transient characteristics of the centrifugal pump in its acceleration and deceleration process were determined by Tsukamoto et al [2] using a theoretical analysis. Wu and Li et al [3,4] examined the starting and stopping transients of the centrifugal pumps and mixed flow pumps by combining experimental and numerical calculations. A systematic study on the start-up process of centrifugal pumps with different valve opening degrees, different impeller outside diameters, different blade widths, and different starting descending speeds was conducted by Elaoud et al [5,6].…”

Section: Introductionmentioning

confidence: 99%

The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Zhao

Wang

et al. 2019

Processes

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Coast-down characteristics are the crucial safety evaluation factors of nuclear reactor coolant pumps. The energy stored at the highest moment of inertia of the reactor coolant pump unit is utilized to maintain a normal coolant supply to the core of the cooling loop system for a short period of time during the coast-down transition. As a result of the high inertia moment of the rotor system, the unit requires a high reliability of the nuclear reactor coolant pump and consumes considerable energy in the start-up and normal operation. This paper considers the operational characteristics of the coast-down transition process based on the existing hydraulic model of the nuclear reactor coolant pump. With the implementation of an orthogonal test, the hydraulic performance of the nuclear reactor coolant pump was optimized, and the optimal combination of impeller geometrical parameters was selected using multivariate linear regression to prolong the coast-down time of the reactor coolant pump and to avoid serious nuclear accidents.

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“…Aiming at the internal unsteady flow field and noise characteristics of the centrifugal pump, a large number of scholars conducted a lot of researches and analysis on this kind of problems through theoretical analysis, experimental research, numerical simulation and so on [1][2][3][4][5][6][7]. Langthjem [8,9] conducted a numerical computation for the flow field and sound field of a two-dimensional centrifugal pump.…”

Section: Introductionmentioning

confidence: 99%

Numerical computation for the impact of flow rate and rotational speed on the flow-induced noise of the centrifugal pump

Wang¹,

Song²,

Song³

et al. 2017

J. vibroeng.

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This paper adopted an indirect mixed method (computational fluid dynamics + boundary element method) based on computational fluid dynamics + Lighthill acoustic analogy theories to compute the flow field and flow-induced noise of the centrifugal pump, and experimentally verified the correctness of computational results. The pressure distribution of the centrifugal pump through an unsteady computation showed that there were obvious separation vortexes at the outlet of the centrifugal pump and pressure at the edge of impellers was obviously more than that of other parts. There were many peak noises on the sound pressure level curve at the outlet of the centrifugal pump. The sound pressure level gradually decreased with the increased frequency. However, sound pressure levels will be a stable value when the analyzed frequency was more than 3000 Hz. Sound pressures at the inlet and outlet of the centrifugal pump were relatively large. Sound pressures at the inlet pipeline gradually decreased from outside to inside and sound pressures of outlet pipeline gradually decreased from inside to outside. The structure of the centrifugal pump was not completely symmetrical, and the sound field was not symmetrical. In addition, the radiation noises in the external field at the inlet and outlet of the centrifugal pump were similar to the radiation of many point sound sources. Peak values of flow-induced noises at the outlet of the centrifugal pump were more than those at the inlet of the centrifugal pump under the working condition of different rotational speeds and flow rates. In the meanwhile, sound pressure levels at the inlet and outlet of the centrifugal pump did not show many differences in amplitudes when the rotational speed was small. When the rotational speed reached up to 3000 r/min, the sound pressure at inlet was more than that at outlet within 1500 Hz-4500 Hz. At many peak frequency points, peak noises at outlet were obviously more than those at inlet, which thus proved that fluid caused large pressure fluctuations due to the interaction between impellers and volutes after flowing through the centrifugal pump and flow-induced noises caused by pressure fluctuations were mainly reflected in blade frequency. The change of the rotational speed and flow rate would not only increase the flow-induced noise in the centrifugal pump, but also seriously affect the external radiation sound field of the centrifugal pump.

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Experimental study on hydrodynamic performance of a cavitating centrifugal pump during transient operation

Cited by 40 publications

References 11 publications

Maximum suction lift of water jet pumps

Maximum suction lift of water jet pumps

The Influence and Optimization of Geometrical Parameters on Coast-Down Characteristics of Nuclear Reactor Coolant Pumps

Numerical computation for the impact of flow rate and rotational speed on the flow-induced noise of the centrifugal pump

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