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Research Papers: Fundamental Issues and Canonical Flows

Influence of Geometry of Inlet Guide Vanes on Pressure Fluctuations of a Centrifugal Pump

[+] Author and Article Information
Ming Liu

State Key Laboratory of
Hydroscience and Engineering,
Department of Energy and
Power Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: lmamor@126.com

Lei Tan

State Key Laboratory of
Hydroscience and Engineering,
Department of Energy and
Power Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: tanlei@mail.tsinghua.edu.cn

Shuliang Cao

State Key Laboratory of
Hydroscience and Engineering,
Department of Energy and
Power Engineering,
Tsinghua University,
Beijing 100084, China
e-mail: groupcaotan@163.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 19, 2017; final manuscript received March 9, 2018; published online May 2, 2018. Assoc. Editor: Wayne Strasser.

J. Fluids Eng 140(9), 091204 (May 02, 2018) (13 pages) Paper No: FE-17-1595; doi: 10.1115/1.4039714 History: Received September 19, 2017; Revised March 09, 2018

Prewhirl regulation by inlet guide vanes (IGVs) has been proven as an effective method for operation regulation of centrifugal pumps. By contrast, the influence of the geometry of IGVs on operation stability of centrifugal pump remains unknown. The pressure fluctuations and flow patterns in a centrifugal pump without and with two-dimensional (2D) or three-dimensional (3D) IGVs are investigated numerically at 1.0Qd, 0.6Qd, and 1.2Qd. Renormalization group (RNG) k–ε turbulence model is used as turbulence model, and fast Fourier transform (FFT) method is used to analyze the pressure fluctuations. The dominant frequency of pressure fluctuations in impellers is either the rotational frequency fi or twice thereof for pumps without and with IGVs at three flow rates, while the dominant frequency is constantly the blade passing frequency in volute. For 1.0Qd, the comparison of pumps without IGVs indicates that the maximum amplitude of pressure fluctuations at fi in pumps with 2D IGVs is decreased by an average of 22.2%, and the amplitude is decreased by an average of 44.9% in pumps with 3D IGVs. The IGVs mainly influence the pressure fluctuations at fi but indicate minimal influence at 2fi. For 0.6Qd, the comparison of pumps without IGVs denotes that the maximum amplitudes of pressure fluctuations at fi in pumps with 2D or 3D IGVs both increase; the maximum increase is 2.01%. For 1.2Qd, the comparison of pumps without IGVs indicates that the maximum amplitudes of pressure fluctuations at fi in pumps with 2D or 3D IGVs both decrease; the maximum decline is 15.9%.

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Figures

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Fig. 1

3D structure of IGVs: (a) 2D IGVs and (b) 3D IGVs

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Fig. 2

Geometric structure of IGVs: (a) 2D IGVs and (b) 3D IGVs

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Fig. 3

Computation domain of centrifugal pump with IGVs

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Fig. 4

IGVs at different prewhirl angles: (a) γ = 24 deg, (b) γ = 12 deg, (c) γ = 0 deg, (d) γ = 12 deg, and (e) γ = 24 deg

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Fig. 5

Mesh of IGVs and impeller: (a) IGVs and (b) Impeller

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Fig. 7

Independence test of time-step: (a) PS2, (b) PM2, and (c) SS2

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Fig. 8

Comparison of pump performance between experimental and numerical results: (a) γ = 0 deg, (b) γ = 12 deg, (c) γ = 24 deg, (d) γ = 12 deg, and (e) γ = 24 deg

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Fig. 9

Time history of pressure on monitor point PM4

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Fig. 10

Frequency spectra of pressure fluctuations on monitoring points at 1.0Qd: (a) Without IGVs (impeller), (b) without IGVs (volute), (c) with 2D IGVs (impeller), (d) with 2D IGVs (volute), (e) with 3D IGVs (impeller), and (f) with 3D IGVs (volute)

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Fig. 11

Amplitude of pressure fluctuations on PM1–PM5 at 1.0Qd: (a) fi and (b) 2fi

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Fig. 12

Normalized amplitude and phase of pressure fluctuations at fi or 2fi: (a) amplitude for 2D IGVs, (b) amplitude for 3D IGVs, (c) phase for 2D IGVs, and (d) phase for 3D IGVs

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Fig. 13

Peak values of pressure fluctuations in impeller

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Fig. 14

Peak values of pressure fluctuations in volute

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Fig. 15

Pressure distribution in impeller at 1.0Qd: (a) without IGVs, (b) with 2D IGVs, and (c) with 3D IGVs

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Fig. 16

Flow pattern in pump without IGVs at 0.6Qd: (a) T/24, (b) 2T/24, (c) 3T/24, and (d) 4T/24

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Fig. 17

Flow pattern in pump with 2D IGVs at 0.6Qd: (a) T/24, (b) 2T/24, (c) 3T/24, and (d) 4T/24

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Fig. 18

Flow pattern in pump with 3D IGVs at 0.6Qd: (a) T/24, (b) 2T/24, (c) 3T/24, and (d) 4T/24

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Fig. 19

Pressure distribution in impeller at 1.2Qd: (a) without IGVs, (b) with the 2D IGVs, and (c) with 3D IGVs

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Fig. 20

Pressure difference of pump with 2D IGVs minus pump without IGVs: (a) 0.6Qd, (b) 1.0Qd, and (c) 1.2Qd

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Fig. 21

Pressure difference of pump with 3D IGVs minus pump 2D IGVs: (a) 0.6Qd, (b) 1.0Qd, and (c) 1.2Qd

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Fig. 22

Velocity difference of pump with 2D IGVs minus pump without IGVs: (a) 0.6Qd, (b) 1.0Qd, and (c) 1.2Qd

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Fig. 23

Velocity difference of pump with 3D IGVs minus pump 2D IGVs: (a) 0.6Qd, (b) 1.0Qd, and (c) 1.2Qd

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