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Research Papers: Multiphase Flows

Numerical Study of Solid Particle Erosion in a Centrifugal Pump for Liquid–Solid Flow

[+] Author and Article Information
Fen Lai

Key Laboratory of Thermo-Fluid
Science and Engineering of MOE,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: laifen198609@163.com

Yu Wang

School of Energy and Power Engineering,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: 1561552276 @qq.com

Saeed A. EI-Shahat

Key Laboratory of Thermo-Fluid
Science and Engineering of MOE,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: saeedanwar2012@yahoo.com

Guojun Li

Key Laboratory of Thermo-Fluid
Science and Engineering of MOE,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an, Shaanxi 710049, China
e-mail: liguojun@mail.xjtu.edu.cn

Xiangyuan Zhu

Key Laboratory of Thermo-Fluid
Science and Engineering of MOE,
Xi'an Jiaotong University,
No. 28, Xianning West Road,
Xi'an 710049, Shaanxi, China
e-mail: xiangyuan.zhu@hotmail.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received January 10, 2019; final manuscript received April 17, 2019; published online June 3, 2019. Editor: Francine Battaglia.

J. Fluids Eng 141(12), 121302 (Jun 03, 2019) (16 pages) Paper No: FE-19-1022; doi: 10.1115/1.4043580 History: Received January 10, 2019; Revised April 17, 2019

Solid particle erosion is a serious issue in centrifugal pumps that may result in economic losses. Erosion prediction in centrifugal pump is complex because the flow field inside it is three-dimensional (3D) unsteady and erosion can be affected by numerous factors. In this study, solid particle erosion of the entire centrifugal pump for liquid–solid flow is investigated numerically. Two-way coupled Eulerian–Lagrangian approach is adopted to calculate the liquid–solid interaction. The reflection model proposed by Grant and Tabakoff and the erosion model proposed by the Erosion/Corrosion Research Center are combined to calculate the erosion rate and predict the erosion pattern. Results show that for the baseline case, the inlet pipe is the least eroded component, whereas the impeller is the most eroded component. The highest average and maximum erosion rates occur at the hub of impeller. The most severe erosion region of a blade is the leading edge with a curvature angle that varies from 55 deg to 60 deg. The most severe erosion region of a volute is in the vicinity of a curvature angle of 270 deg. The impeller erosion pattern, especially the middle part of the hub and the vicinity of the blade pressure side, can be greatly influenced by operation parameters, such as flow rate, particle concentration, and particle size.

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Figures

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Fig. 1

Comparison between numerical results and experimental data

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Fig. 2

Model of the centrifugal pump

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Fig. 3

Structured hexahedron grids

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Fig. 4

Grid independence study

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Fig. 5

Test centrifugal pump

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Fig. 6

Centrifugal pump closed test rig

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Fig. 7

Comparisons of head and efficiency between the numerical results and experimental data

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Fig. 8

Fluid velocity contour t = 2 s: (a) section: x = 0, (b) section: y = 0, and (c) section: z = 0

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Fig. 9

Particle motion characteristics colored by particle velocity: (a) particle trajectory and (b) particle distribution

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Fig. 10

Particle concentration contour t = 2 s: (a) front view, (b) back view, and (c) lateral view

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Fig. 11

Erosion pattern t = 2 s: (a) front view, (b) back view, and (c) lateral view

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Fig. 12

Erosion pattern: (a) t = 0.5 s, (b) t = 1.0 s, and (c) t = 1.5 s

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Fig. 13

Erosion rate for different regions of the centrifugal pump: (a) average erosion rate and (b) maximum erosion rate

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Fig. 14

Erosion contour of the marked blade and the erosion rate along the marked blade curvature angle in anticlockwise direction

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Fig. 15

Erosion contour of the volute and the erosion rate along the volute curvature angle in anticlockwise direction

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Fig. 16

Erosion contours of the impeller for three flow rates (left, shroud; middle, blades; right, hub): (a) Q = 20 m3h−1, (b) Q = 25 m3h−1, and (c) Q = 30 m3h−1

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Fig. 17

Variations in the average erosion rate of the impeller with different flow rates

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Fig. 18

Erosion contours of the impeller for three particle concentrations (left, shroud; middle, blades; right, hub): (a) Cm = 7 kg m−3, (b) Cm = 32 kg m−3, and (c) Cm = 57 kg m−3

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Fig. 19

Variations in the average erosion rate with different particle concentrations

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Fig. 20

Erosion contour of the impeller for different particle sizes (left, shroud; middle, blades; right, hub): (a) dp = 30 μ, (b) dp = 60 μ, and (c) dp = 90 μ

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Fig. 21

Variations in the average erosion rate of the impeller with different particle sizes

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