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TECHNICAL PAPERS

Flow in a Centrifugal Pump Impeller at Design and Off-Design Conditions—Part I: Particle Image Velocimetry (PIV) and Laser Doppler Velocimetry (LDV) Measurements

[+] Author and Article Information
Nicholas Pedersen, Poul S. Larsen

Department of Mechanical Engineering, Fluid Mechanics Section, Technical University of Denmark, DK-2800 Lyngby, Denmark

Christian B. Jacobsen

Fluid Dynamic Engineering, Grundfos Management A/S, DK-8850 Bjerringbro, Denmark

J. Fluids Eng 125(1), 61-72 (Jan 22, 2003) (12 pages) doi:10.1115/1.1524585 History: Received September 20, 2001; Revised May 06, 2002; Online January 22, 2003
Copyright © 2003 by ASME
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References

Figures

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Two stages of an industrial multistage pump with the shrouded centrifugal pump impeller under study, 13
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Blade-to-blade (left) and meridional (right) view of the shrouded centrifugal pump impeller, 13
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Measured performance curve for a single stage of the multistage pump under investigation, 13. The design load condition is marked by a star and the quarter-load condition by a circle.
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Closed-loop test rig consisting of a 400-mm diameter cylindrical tank with the 190-mm diameter test impeller mounted in the vertical center plane. Optical access was provided from the sides as well as from beneath, 11.
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Schematic of the PIV setup
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Measurement positions. The squares show the locations of the two 93×94 mm2 field-of-views measured with PIV, and the circles indicate the LDV measurement radii.
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Sample instantaneous velocity vector maps; (a) absolute velocity C, (b) corresponding relative velocity vector map W . (Q/Qd=1.0).
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Ensemble averaged relative speed |〈W 〉|. A copy of the measured data has been rotated 60 deg with respect to the rotation axis to demonstrate the flow congruence between adjacent passages. (Q/Qd=1.0).
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Vector plot of the relative velocity 〈W 〉 measured with LDV at radial stations of r/R2={0.65,0.75,0.90,1.01}.(Q/Qd=1.0).
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(a) Contour plot of the portion k2D of the turbulent kinetic energy, measured by PIV. (b) Convergence history of the first and second moments in the three sample grid points P1,P2, and P3. (b1) Horizontal velocity component 〈Cx〉. (b2) Turbulent kinetic energy k2D.(Q/Qd=1.0).
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PIV vector maps of the relative velocity W . (a) Sample instantaneous snapshot. (b) Ensemble average of 1000 instantaneous samples. (c) Sample instantaneous deviation. (Q/Qd=0.25).
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Details of the ensemble averaged relative PIV velocity field 〈W 〉 shown in Fig. 11(b). (a) Inlet stall cell. (b) Reversed flow at outlet. (Q/Qd=0.25).
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Vector maps of the ensemble averaged relative velocity 〈W 〉. The well-behaved passage is denoted A and the stalled passage is denoted B. Only every second vector is shown to avoid crowding. (Q/Qd=0.25).
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Vector plot of the relative velocity 〈W 〉 measured with LDV at radial stations of r/R2={0.50,0.65,0.75,0.90}.(Q/Qd=0.25).
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Contour plot of the measured portion k2D of the turbulent kinetic energy. (Q/Qd=0.25).
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Bin resolved LDV data obtained at r/R2=0.90. (a) Radial velocity 〈Cr〉. (b) Tangential velocity 〈Ct〉. (c) RMS-velocity Cr. (d) Number of radial velocity samples. (Q/Qd=1.0).
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Bin resolved LDV data obtained at r/R2=0.90. (a) Radial velocity 〈Cr〉. (b) Tangential velocity 〈Ct〉. (c) RMS-velocity Cr. (d) Number of radial velocity samples. (Q/Qd=0.25).
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Blade-to-blade distributions of the mean radial velocity 〈Cr〉/U2 measured with PIV (— —) and LDV (–) at flow rates of Qd (left) and 0.25Qd (right). (a) r/R2=0.50, (b) r/R2=0.75, (c) r/R2=0.98.
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Blade-to-blade distributions of the mean tangential velocity 〈Wt〉/U2 measured with PIV (— —) and LDV (–) at flow rates of Qd (left) and 0.25Qd (right). (a) r/R2=0.50, (b) r/R2=0.75, (c) r/R2=0.98.
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Blade-to-blade distributions of the turbulence intensity Tu=k2D/U2 measured with PIV (— —) and LDV (–) at flow rates of Qd (left) and 0.25Qd (right). (a) r/R2=0.65, (b) r/R2=0.90, (c) r/R2=0.98.

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