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Research Papers: Flows in Complex Systems

Research on Improving the Dynamic Performance of Centrifugal Pumps With Twisted Gap Drainage Blades

[+] Author and Article Information
Zheng-Chuan Zhang

Shanghai Institute of
Applied Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: zhangzc9898@163.com

Hong-Xun Chen

Shanghai Institute of
Applied Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: chenhx@shu.edu.cn

Zheng Ma

Chinese Ship Scientific Research Center,
Shanghai 200011, China
e-mail: mazh8888@sina.com

Jian-Wu He

Shanghai Institute of
Applied Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: 2386590618@qq.com

Hui Liu

Shanghai Marine Equipment Research Institute,
Shanghai 200031, China
e-mail: huiliu119@foxmail.com

Chao Liu

Shanghai Institute of
Applied Mathematics and Mechanics,
Shanghai University,
Shanghai 200072, China
e-mail: 312896533@qq.com

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 28, 2018; final manuscript received February 2, 2019; published online March 18, 2019. Assoc. Editor: Satoshi Watanabe.

J. Fluids Eng 141(9), 091101 (Mar 18, 2019) (15 pages) Paper No: FE-18-1309; doi: 10.1115/1.4042885 History: Received April 28, 2018; Revised February 02, 2019

Through numerical simulation and experiments analysis, it is indicated that the hydraulic and anticavitation performance of a centrifugal pump with twisted gap drainage blades based on flow control theory can be significantly improved under certain operating conditions. In order to introduce the technology of gap drainage to practical applications, we put forward the parameter formulas of the twisted gap drainage blade to design three-dimensional new type blade, which are also proved to be effective for enhancing the dynamic characteristics of the centrifugal pump. Furthermore, a practical centrifugal pump is redesigned to be a twisted gap drainage impeller with the same structure size as the original impeller, and the nonlinear hybrid Reynolds-averaged Navier–Stokes (RANS)/large eddy simulation (LES) method is employed to simulate the hydraulic dynamic characteristics. Numerical simulation results show that the hydraulic performance and dynamic characteristics of the redesigned impeller centrifugal pump are significantly enhanced. In experiments, the twisted gap drainage blades structure not only remarkably improves the hydraulic performance and the pressure pulsation characteristics of the centrifugal pump but also reduces the vibration intensity.

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References

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Figures

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Fig. 1

The three-dimensional model of two impellers: axial projection: (a) con-impeller, (b) gap-impeller, and (c) vice and main blade detail

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Fig. 2

Computational domain: (a) inlet pipe, (b) front cavity, (c) impeller, (d) volute, and (e) rear cavity

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Fig. 3

Mesh of computing model (grid N1): (a) origin impeller, (b) gap impeller, (c) volute (d) the volute tongue local magnification, and (e) integral mesh

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Fig. 4

Monitoring points layout of pressure pulsation in impeller and volute

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Fig. 5

Variation of the pressure pulsation amplitude of circumferential points with flow in impellers (left: con, right: gap; R = 0.3R, 0.5R, and R): (a) R = 0.3R, (b) R = 0.5R, and (c) R = R

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Fig. 6

Variation of the pressure pulsation amplitude of monitoring points with flow in the volute of two different centrifugal pumps

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Fig. 7

Spectrum distribution of pressure pulsation in impellers under low and design flow rate condition (left: con, right: gap; Q = 0.5Q0, 1.0Q0)

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Fig. 8

Spectrum distribution of pressure pulsation inside the impellers under large flow rate condition (left: con, right: gap; Q = 1.3Q0, 1.5Q0)

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Fig. 9

Spectrum distribution of pressure pulsation in the volute under low and design flow rate condition (left: con, right: gap; Q = 0.5Q0, 1.0Q0)

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Fig. 10

Spectrum distribution of pressure pulsation in the volute under large flow rate condition (left: con, right: gap; Q = 1.3Q0, 1.5Q0)

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Fig. 11

Velocity vector distribution in the axial center plane of the impeller and the curve of the amplitude of pressure fluctuating at 0.3R with the variation of flow rate (top: con, bottom: gap; Q = 1.5Q0)

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Fig. 12

Pressure distribution and vortex dissipative distribution cloud in the axial center plane of the impeller and volute under large flow rate condition (left: con, right: gap; Q = 1.5Q0)

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Fig. 13

Axial center plane streamline of impeller and volute and spectrum distribution of pressure pulsation in volute (top: con, bottom: gap; Q = 1.5Q0)

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Fig. 14

Comparison of numerical results and experimental data of hydraulic performance in pumps (left: con; right: gap)

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Fig. 15

Mutual comparison of hydraulic performance between traditional and 3D-gap centrifugal pump (left: experiments, right: CFD simulation)

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Fig. 16

Comparison of the vibration characteristics (dB) of the two centrifugal pumps under 0.8Q0, Q0, and 1.15Q0 conditions

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Fig. 17

Comparison of the vibration characteristics (dB) under 0.8Q0, Q0, and 1.15Q0 conditions (left: con, right: gap)

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