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Research Papers: Multiphase Flows

Cavitation-Induced Unsteady Flow Characteristics in the First Stage of a Centrifugal Charging Pump

[+] Author and Article Information
Fan Zhang

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212013, China;
Institute of Fluid Mechanics and
Fluid Machinery,
Technical University of Kaiserslautern,
Kaiserslautern 67663, Germany
e-mail: zf513301649@126.com

Shouqi Yuan

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212013, China
e-mail: shouqiy@ujs.edu.cn

Qiang Fu

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212013, China
e-mail: ujsfq@sina.com

Ji Pei

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212013, China
e-mail: jpei@ujs.edu.cn

Martin Böhle

Institute of Fluid Mechanics and
Fluid Machinery,
Technical University of Kaiserslautern,
Kaiserslautern 67663, Germany
e-mail: martin.boehle@mv.uni-kl.de

Xusong Jiang

National Research Center of Pumps,
Jiangsu University,
Zhenjiang 212013, China
e-mail: 946021459@qq.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received March 25, 2015; final manuscript received July 16, 2016; published online September 20, 2016. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 139(1), 011303 (Sep 20, 2016) (13 pages) Paper No: FE-15-1202; doi: 10.1115/1.4034362 History: Received March 25, 2015; Revised July 16, 2016

Cavitation is the main factor that causes reliability problems in centrifugal charging pumps (CCPs) in nuclear power plants. In this study, the cavitation-induced unsteady flow characteristics of a CPR1000 CCP were investigated by numerical and experimental methods. The vapor distribution in the impeller, velocity fluctuation, and pressure fluctuation results in the time and frequency domains were considered for several typical monitoring points in the impeller and volute. The pressure fluctuations in the impeller occurred at an impeller rotating frequency of fR and its integer harmonics, whereas those in the volute mainly occurred at an impeller blade-passing frequency of fB and its integer harmonics. The absolute error between the simulated and measured NPSHr was 3.6%, and that between the calculated and measured head was 2.9%, validating the simulation of the cavitation performances of a CCP.

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References

Figures

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Fig. 1

Cross section model of a CCP

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Fig. 2

Three-dimensional model of the CCP with the first-stage impeller

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Fig. 3

Head comparison under five different grids

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Fig. 4

Monitoring points in the CCP

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Fig. 5

Five states in a cavitation process

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Fig. 6

Vapor volume fraction in the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 7

Static pressure distribution in the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 8

Vapor volume fraction distribution along the radial position of the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 9

Vapor volume fraction in the suction side of the blade in the process of critical cavitation NPSH3%. (a) t1 = ΔT/6, (b) t2 = 2ΔT/6, (c) t3 = 3ΔT/6, (d) t4 = 4ΔT/6, (e) t5 = 5ΔT/6, and (f) t6 = ΔT.

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Fig. 10

Velocity fluctuation in the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 11

Velocity fluctuation in the volute: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 12

Pressure fluctuation in the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 13

Frequency domain results of pressure fluctuation in the impeller: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 14

Pressure fluctuation in the volute: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 15

Frequency domain results of pressure fluctuation in the volute: (a) head detection cavitation, (b) developing cavitation, (c) critical cavitation, (d) large cavitation, and (e) head breakdown cavitation

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Fig. 16

Test rig of the charging pump

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Fig. 17

Radial cross section of the charging pump

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Fig. 18

Hydraulic performance of the charging pump with n = 4500 rpm

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Fig. 19

Numerical simulation and test result on cavitation performance at Q = 160 m3/h with n = 4500 rpm

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Fig. 20

Cavitation performance test at Q = 13.6 m3/h, 34 m3/h, 110 m3/h, and 148 m3/h with n = 4500 rpm

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