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TECHNICAL PAPERS

Experimental Study and Numerical Simulation of the FLINDT Draft Tube Rotating Vortex

[+] Author and Article Information
Gabriel Dan Ciocan

Laboratory for Hydraulic Machines, Ecole Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007, Lausanne, Switzerlandgabrieldan.ciocan@orange.fr

Monica Sanda Iliescu

Laboratory for Hydraulic Machines, Ecole Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007, Lausanne, Switzerlandmsiliescu@yahoo.fr

Thi Cong Vu

Hydropower Technology, GE Energy, 795 George V, Lachine, Quebec, H8S-4K8, Canadathi.vu@ps.ge.com

Bernd Nennemann

Hydropower Technology, GE Energy, 795 George V, Lachine, Quebec, H8S-4K8, Canadabernd.nennemann@ps.ge.com

François Avellan

Laboratory for Hydraulic Machines, Ecole Polytechnique Fédérale de Lausanne (EPFL), Avenue de Cour 33bis, CH-1007, Lausanne, Switzerlandfrancois.avellan@epfl.ch

J. Fluids Eng 129(2), 146-158 (Jul 10, 2006) (13 pages) doi:10.1115/1.2409332 History: Received June 27, 2005; Revised July 10, 2006

The dynamics of the rotating vortex taking place in the discharge ring of a Francis turbine for partial flow rate operating conditions and cavitation free conditions is studied by carrying out both experimental flow survey and numerical simulations. 2D laser Doppler velocimetry, 3D particle image velocimetry, and unsteady wall pressure measurements are performs to investigate thoroughly the velocity and pressure fields in the discharge ring and to give access to the vortex dynamics. Unsteady RANS simulation are performed and compared to the experimental results. The computing flow domain includes the rotating runner and the elbow draft tube. The mesh size of 500,000 nodes for the 17 flow passages of the runner and 420,000 nodes for the draft tube is optimized to achieve reasonable CPU time for a good representation of the studied phenomena. The comparisons between the detailed experimental flow field and the CFD solution yield to a very good validation of the modeling of the draft tube rotating vortex and, then, validate the presented approach for industrial purpose applications.

Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Scale model hill chart and part load operating point

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Figure 2

Measurement zones in the cone of the FLINDT turbine

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Figure 3

Calibration setup for 3D PIV measurements

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Figure 4

Phase average calculation of the LDV and PIV velocity signal

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Figure 5

LDV-PIV phase average comparison

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Figure 6

Waterfall diagram and corresponding cavitation ropes

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Figure 7

Computation flow domain and mesh

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Figure 8

Evolution of pressure monitoring in transient computation

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Figure 9

Comparison of CFD and experimental frequency spectra

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Figure 10

Period adjustment and phase shift on the numerical data to compare with the experimental ones

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Figure 11

Phase average wall pressure comparison

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Figure 12

Mean velocity profiles comparison in the cone

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Figure 13

Cz phase average velocity profiles

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Figure 14

Cr - Cz phase average velocity profiles comparison in the cone

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Figure 15

Vorticity field in the cone

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Figure 16

Vortex center evolution in the cone

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Figure 17

Mesh size in the vortex center position

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