Werle´–Legendre Separation in a Hydraulic Machine Draft Tube-Reference-Cited by-同舟云学术

Werle´–Legendre Separation in a Hydraulic Machine Draft Tube

Published:2004-11-01 Issue:6 Volume:126 Page:976-980
ISSN:0098-2202
Container-title:Journal of Fluids Engineering
language:en
Short-container-title:

Author:

Mauri S.¹,Kueny J. L.¹,Avellan F.¹

Affiliation:

1. LMH—Laboratory for Hydraulic Machines, EPFL—Swiss Federal Institute of Technology, Av. Cour 33bis, Lausanne 1007, Switzerland

Abstract

The three-dimensional turbulent flow in a compact hydraulic machine elbow draft tube is numerically investigated for several operating conditions, covering an extended range around the best efficiency point. Comparisons with the experimental data are presented as validation. The interest is focused on the experimentally observed pressure recovery drop occurring near the best efficiency point. The flow is first analyzed locally by means of a topological analysis, then globally with an energetic approach. The study provides evidence for the role played by a Werle´–Legendre separation originating in the bend. The separation is due to the contrasting flow angles imposed by the blades, and the angle resulting from the secondary flow.

Publisher

ASME International

Subject

Mechanical Engineering

Link

http://asmedigitalcollection.asme.org/fluidsengineering/article-pdf/126/6/976/5834827/976_1.pdf

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3. De´lery, J. M. , 2001, “Toward the Elucidation of Three-Dimensional Separation,” Annu. Rev. Fluid Mech., 33, pp. 129–54.

4. Ciocan, G. D., Kueny, J.-L., and Avellan, F., 2000, “Optical Measurement Techniques for Experimental Analysis of Hydraulic Turbines Rotor-Stator Interaction,” Proceedings of 2000 ASME Fluids Engineering Conference, Boston, June 11–15.

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