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Flows in Complex Systems

Numerical Investigations and Performance Experiments of a Deep-Well Centrifugal Pump With Different Diffusers

[+] Author and Article Information
Ling Zhou

 National Research Center of Pumps and Pumping System Engineering and Technology, Jiangsu University, Zhenjiang 212013, People’s Republic of Chinalingzhoo@hotmail.com

Weidong Shi1

 National Research Center of Pumps and Pumping System Engineering and Technology, Jiangsu University, Zhenjiang 212013, People’s Republic of Chinawdshi@ujs.edu.cn

Weigang Lu, Bo Hu, Suqing Wu

 National Research Center of Pumps and Pumping System Engineering and Technology, Jiangsu University, Zhenjiang 212013, People’s Republic of China

1

Corresponding author.

J. Fluids Eng 134(7), 071102 (Jun 21, 2012) (8 pages) doi:10.1115/1.4006676 History: Received November 17, 2011; Revised April 18, 2012; Published June 21, 2012; Online June 21, 2012

In this paper, the design methodology of a new type of three-dimensional surface return diffuser (3DRD) is presented and described in detail. The main goal was to improve the hydrodynamic performance of the deep-well centrifugal pump (DCP). During this study, a two-stage DCP equipped with two different type diffusers was simulated employing the commercial computational fluid dynamics (CFD) software ANYSY-Fluent to solve the Navier-Stokes equations for three-dimensional steady flow. A sensitivity analysis of the numerical model was performed in order to impose appropriate parameters regarding grid elements number and turbulence model. The flow field and the static pressure distribution in the diffusers obtained by numerical simulation were analyzed, and the diffuser efficiency was defined to quantify the pressure conversion capability. The prototype experimental test results were acquired and compared with the data predicted from the numerical simulation, which showed that the performance of the pump with 3DRD is better than that of the traditional cylindrical return diffuser (CRD) under all operating conditions. The efficiency and single-stage head of the pump with 3DRD have been significantly improved compared with the standard DCP of the same class.

Copyright © 2012 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

DCP with different type diffusers (a) space diffuser (b) radial diffuser (c) 3DRD

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Figure 2

Impeller (a) cross section (b) solid model

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Figure 3

Diffuser 3DRD (a) top view (b) cross-section (c) solid model

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Figure 4

Diffuser CRD (a) cross section (b) solid model

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Figure 5

Cross section of investigated DCP with 3DRD

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Figure 6

Deep-well centrifugal pump test rig (not to scale)

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Figure 7

Calculation domains

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Figure 8

Sketch of the structured mesh (a) overview of whole calculation domain (b) impeller (c) diffuser

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Figure 9

Comparison of performance characteristic acquired by numerical simulation

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Figure 10

Comparison of the numerical and test results (a) pump efficiency (b) single-stage head

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Figure 11

Diffuser efficiency

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Figure 12

Velocity vector and tangential velocity contours at diffuser outlet of DCP with 3DRD (a) 1.2Qdes , first stage (b) 1.2Qdes , second stage (c) 1.6Qdes , first stage (d) 1.6Qdes , second stage

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Figure 13

Static pressure distribution of the second stage cross section at Qdes, (a) DCP with 3DRD (b) DCP with CRD

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Figure 14

Monitoring lines locations

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Figure 15

Static pressure change trend of 3DRD at Qdes (a) first stage (b) second stage

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Figure 16

Static pressure change trend of CRD at Qdes (a) first stage (b) second stage

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Figure 17

Upward view of velocity streamlines in diffuser of first stage at Qdes (a) 3DRD (b) CRD

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Figure 18

Static pressure distributions in the diffuser middle section of first stage at Qdes (a) 3DRD (b) CRD

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Figure 19

3DRD solid model

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