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Research Papers

Investigation of Periodically Unsteady Flow in a Radial Pump by CFD Simulations and LDV Measurements

[+] Author and Article Information
Jianjun Feng1

Department of Mechanical Engineering, Faculty of Engineering, University of Duisburg-Essen, Duisburg 47048, Germanyjianjun.feng@uni-due.de

Friedrich-Karl Benra

Department of Mechanical Engineering, Faculty of Engineering, University of Duisburg-Essen, Duisburg 47048, Germanyfriedrich.benra@uni-due.de

Hans Josef Dohmen

Department of Mechanical Engineering, Faculty of Engineering, University of Duisburg-Essen, Duisburg 47048, Germanyhans-josef.dohmen@uni-due.de

1

Corresponding author.

J. Turbomach 133(1), 011004 (Sep 07, 2010) (11 pages) doi:10.1115/1.4000486 History: Received March 20, 2008; Revised July 05, 2009; Published September 07, 2010; Online September 07, 2010

The periodically unsteady flow fields in a low specific speed radial diffuser pump have been investigated both numerically and experimentally for the design condition (Qdes) and also one part-load condition (0.5Qdes). Three-dimensional, unsteady Reynolds-averaged Navier–Stokes equations are solved on high-quality structured grids with the shear stress transport turbulence model by using the CFD (computational fluid dynamics) code CFX-10 . Furthermore, two-dimensional laser Doppler velocimetry (LDV) measurements are successfully conducted in the interaction region between the impeller and the vaned diffuser, in order to capture the complex flow with abundant measurement data and to validate the CFD results. The analysis of the obtained results has been focused on the behavior of the periodic velocity field and the turbulence field, as well as the associated unsteady phenomena due to the unsteady interaction. In addition, the comparison between CFD and LDV results has also been addressed. The blade orientation effects caused by the impeller rotation are quantitatively examined and detailedly compared with the turbulence effect. This work offers a good data set to develop the comprehension of the impeller-diffuser interaction and how the flow varies with relative impeller position to the diffuser in radial diffuser pumps.

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Figures

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Figure 5

Comparison between I¯u and T¯u in the impeller region at Qdes, obtained from LDV. (a) Time-averaged impeller unsteady intensity and (b) time-averaged turbulence intensity.

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Figure 11

Contours of S¯u and T¯u in the diffuser at Qdes, from LDV. (a) S¯u at Qdes and (b) T¯u at Qdes.

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Figure 12

Contours of S¯u and T¯u in the diffuser at 0.5Qdes, from LDV. (a) S¯u and (b) T¯u.

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Figure 1

Cross section of the pump

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Figure 14

Flow separations at φ=0 deg, 0.5Qdes. (a) Relative velocity field from CFD and (b) velocity comparison at r/R2=0.757.

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Figure 13

T¯u and S¯u at Qdes and 0.5Qdes in the diffuser region, from LDV. (a) r/R2=1.01, (b) inlet throat, (c) outlet throat, and (d) r/R4=1.01.

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Figure 10

Periodic velocity vectors obtained from LDV, Qdes. (a) φ=−24 deg, (b) φ=−10 deg, (c) φ=0 deg, and (d) φ=10 deg.

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Figure 9

Incidence variation at Qdes, from CFD

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Figure 8

Turbulence intensity fields for different impeller positions at Qdes, from LDV. (a) φ=−10 deg, (b) φ=0 deg, (c) φ=10 deg, and (d) φ=26 deg.

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Figure 7

Comparison of the absolute flow angles between CFD and LDV, r/R2=1.01, Qdes. (a) φ=−10 deg, (b) φ=0 deg, (c) φ=10 deg, and (d) φ=20 deg.

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Figure 6

Comparison of the relative velocity components between CFD and LDV, r/R2=1.01, Qdes. (a) φ=−10 deg, (b) φ=0 deg, (c) φ=10 deg, and (d) φ=20 deg.

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Figure 4

Evolution of the radial and circumferential components in the impeller region at Qdes, from LDV. (a) r/R2=0.757, (b) r/R2=0.93, (c) r/R2=0.983, and (d) r/R2=1.01.

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Figure 3

Velocity triangle

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Figure 2

Measuring region of the LDV

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