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3D PIV and LDV Measurements at the Outlet of a Francis Turbine Draft Tube

[+] Author Affiliations
Monica Sanda Iliescu, Gabriel Dan Ciocan, François Avellan

Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland

Paper No. FEDSM2002-31332, pp. 311-316; 6 pages
doi:10.1115/FEDSM2002-31332
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

For certain geometries of elbow draft tubes of a hydraulic turbine, a drop in the pressure recovery coefficient is observed for a small variation of the flow rate. In order to determine the possible causes of this characteristics shape, the flow field analysis for 4 nearby operating points have been investigated. For velocity and turbulence fields investigation in the outlet section of the studied draft tube, LDV measurements were performed in a transversal section and the 3D-PIV system was qualified for global velocity measurements in longitudinal sections, with an accuracy of less than 3%. By correlating the LDV and PIV results, the quantification of the flow rate through each channel, related to the operating points, and the description of the secondary flow in the outlet zone are possible.

Copyright © 2002 by ASME

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