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Flows in Complex Systems

Experimental Investigation of Draft Tube Inlet Velocity Field of a Propeller Turbine

[+] Author and Article Information
Jean-Mathieu Gagnon, Vincent Aeschlimann, Sébastien Houde

 LAMH, Laval University, Quebec, QC, G1V 0A6, Canada

Felix Flemming, Stuart Coulson

 Voith Hydro, Inc., 760 East Berlin Road, York, PA 17408

Claire Deschenes

 LAMH, Laval University, Quebec, QC, G1V 0A6, Canada

J. Fluids Eng 134(10), 101102 (Sep 28, 2012) (12 pages) doi:10.1115/1.4007523 History: Received April 25, 2012; Revised August 01, 2012; Published September 24, 2012; Online September 28, 2012

The draft tube of reaction hydraulic turbines is subject to numerous investigations since it accounts for a significant portion of the energy recovery. But even with up-to-date computational fluid dynamics methodologies, simulating the draft tube flow remains highly challenging since it is a diverging swirling flow that may undergo flow separations and become dominated by unsteady secondary flows. Within the framework of a collaborative research project on the flow dynamics of a propeller turbine model, the flow at the inlet region of the draft tube was studied using 2D-laser Doppler velocimetry (2D-LDV). Measurements were used to detect and characterize the flow structures at three operating conditions: partial discharge, near best efficiency, and full-load conditions. The paper presents analysis based on phased-averaged velocity fields to yield information on fluctuations and dominant frequencies according to runner positions. The main features detected are the flow nonuniformity at the runner exit and the secondary flow structures associated with the runner hub wake. Those results are part of a larger database aimed at providing test cases for the validation of numerical simulation strategies.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

Hydraulic components of the investigated propeller turbine model

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Figure 2

Efficiency hill chart and operating points ( –η/ηref; −−− guide vane opening)

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Figure 3

LDV measurement locations

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Figure 4

Phase average decomposition of velocity measurements

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Figure 5

Convergence test of ⟨cz⟩ and Cz  rms (OP1, za , r/Rref  = 0.69)

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Figure 6

Average velocity Cz and Ct . Elevation za  = −1.21, zb  = −1.78, and zc  = −2.11; OP1, OP2, and OP3.

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Figure 7

Average flow imbalance; zb  = −1.78; zc  = −2.11; OP1, OP2, and OP3

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Figure 8

Phase averaged velocity. Vertical axis: axial velocity component and color contours: circumferential velocity component. Azimuth 93.5 deg; elevation za  = −1.21, zb  = −1.78, and zc  = −2.11; OP1, OP2, and OP3. T × N is the dimensionless time and t × N = 1 corresponds to 360 deg of runner rotation.

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Figure 9

Phase averaged velocity. Azimuth 93.5 deg; r/Rref  = 0.75; elevation za  = −1.21, zb  = −1.78, and zc  = −2.11; (a) OP2 and (b) OP3.

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Figure 10

Phase averaged velocity relative to the blade velocity. Azimuth 93.5 deg; r/Rref  = 0.75; OP2.

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Figure 11

Phase velocity fluctuation; vertical axis: axial velocity component and color contours: circumferential velocity component. Azimuth 93.5 deg; elevation za  = −1.21, zb  = −1.78, and zc  = −2.11; OP1, OP2, and OP3.

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Figure 12

Phase velocity fluctuation. Azimuth 93.5 deg; r/Rref  = 0.75; elevation za  = −1.21, zb  = −1.78, and zc  = −2.11; (a) OP1, (b) OP2, and (c) OP3.

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Figure 13

Frequency at elevation zb , azimuth 93.5 deg (r/Rmax  < 0 corresponds to the azimuth 93.5 deg + 180 deg); from top to bottom: OP1, OP2, and OP3

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Figure 14

Spectrum amplitude at OP1 for elevation zb and zc

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