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Research Papers: Flows in Complex Systems

Unsteady Flow Structures and Pressure Pulsations in a Nuclear Reactor Coolant Pump With Spherical Casing

[+] Author and Article Information
Dan Ni

School of Energy and Power Engineering,
Jiangsu University,
No. 301 Xuefu Road,
Zhenjiang 212013, China
e-mail: nxm0424@163.com

Minguan Yang

School of Energy and Power Engineering,
Jiangsu University,
No. 301 Xuefu Road,
Zhenjiang 212013, China
e-mail: mgyang@ujs.edu.cn

Ning Zhang

School of Energy and Power Engineering,
Jiangsu University,
No. 301 Xuefu Road,
Zhenjiang 212013, China
e-mail: zhangningwlg@163.com

Bo Gao

School of Energy and Power Engineering,
Jiangsu University,
No. 301 Xuefu Road,
Zhenjiang 212013, China
e-mail: gaobo@ujs.edu.cn

Zhong Li

School of Energy and Power Engineering,
Jiangsu University,
No. 301 Xuefu Road,
Zhenjiang 212013, China
e-mail: lizhong@ujs.edu.cn

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 20, 2016; final manuscript received December 20, 2016; published online March 16, 2017. Assoc. Editor: Riccardo Mereu.

J. Fluids Eng 139(5), 051103 (Mar 16, 2017) (14 pages) Paper No: FE-16-1263; doi: 10.1115/1.4035638 History: Received April 20, 2016; Revised December 20, 2016

Severe vibrations induced by flow instabilities in the nuclear reactor coolant pump (RCP) are detrimental to the safe operation of the pump. Due to the particular spherical casing in the RCP, the internal flow structures are extremely ambiguity and complicated. The goal of the present work is to shed comprehensive light on the unsteady flow structures and its correlation with the pressure pulsations by using large eddy simulation (LES) method of the RCP. The vorticity distribution and the shedding vortex from the blade trailing edge are depicted in detail. Furthermore, the internal correlations between the flow unsteadiness and pressure pulsation are illustrated in some special regions of the RCP. Evidently, some main excitation components in the pressure spectra are excited by the shedding vortex. Besides, components at blade passing frequency (fBPF) are closely associated with rotor–stator interaction between the wake flow from the impeller outlet and unsteadiness vortexes shedding from the diffuser blade trailing edge. It is thought to be that the pressure pulsations of the RCP are closely associated with the corresponding vorticity distribution and the unsteady vortex shedding effect.

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References

Figures

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Fig. 1

Assembly and computational domain of the RCP model pump: (a) the assembly of the RCP model pump and (b) the computational domain of the RCP model pump

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Fig. 2

Closed-loop test rig

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Fig. 3

Test used the diffuser and spherical casing: (a) the diffuser and (b) the spherical casing

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Fig. 4

Structured mesh of the impeller

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Fig. 5

Details of the monitoring points on the RCP model pump

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Fig. 6

Hydraulic performance comparison between the experimental and numerical results

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Fig. 7

Pressure spectra of the monitoring points D1 and transient vorticity magnitude of the midspan plane using LES and RANS methods: (a) pressure spectra and (b) transient vorticity magnitude of the midspan plane

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Fig. 8

Pressure spectra of the monitoring points at the diffuser outlet

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Fig. 9

Pressure spectra of the spherical casing in the circumferential direction

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Fig. 10

Pressure pulsation amplitude values at blade passing frequency (fBPF)

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Fig. 11

Pressure pulsation amplitude values using RMSE

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Fig. 12

Pressure spectra (left) and vorticity spectra (right) of monitoring points near the left region of the discharge nozzle (points C1, C2, and C3)

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Fig. 13

Pressure spectra (left) and vorticity spectra (right) of monitoring points near the right region of the discharge nozzle (points C4, C5, C6, and C3)

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Fig. 14

Vorticity magnitude at the midspan plane of the RCP

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Fig. 15

Evolution process of transient vorticity magnitude in one rotating cycle at regions α and β

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Fig. 16

Evolution process of Q-criterion in one rotating cycle at regions α and β

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Fig. 17

Velocity magnitude of the midspan plane in the RCP

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Fig. 18

Pressure spectra (left) and vorticity spectra (right) of monitoring points in region α and region β (points D1 and W7)

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Fig. 19

Evolution process of the transient vorticity magnitude in one rotating cycle at region δ and region γ

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Fig. 20

Magnification figure of the Q-criterion in one periodical vortex shedding at region δ and region γ

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Fig. 21

Pressure spectra (left) and vorticity spectra (right) of monitoring points in region δ and region γ (points D2 and W6)

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