Werle´–Legendre Separation in a Hydraulic Machine Draft Tube
- Mauri, S. LMH—Laboratory for Hydraulic Machines, EPFL—Swiss Federal Institute of Technology, Av. Cour 33bis, Lausanne 1007, Switzerland
- Kueny, J. L. LMH—Laboratory for Hydraulic Machines, EPFL—Swiss Federal Institute of Technology, Av. Cour 33bis, Lausanne 1007, Switzerland
- Avellan, F. LMH—Laboratory for Hydraulic Machines, EPFL—Swiss Federal Institute of Technology, Av. Cour 33bis, Lausanne 1007, Switzerland
- 2005-3-11
Published in:
- Journal of Fluids Engineering. - ASME International. - 2004, vol. 126, no. 6, p. 976-980
English
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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1115/1.1839930
- ISSN 0098-2202
- Persistent URL
- https://sonar.ch/global/documents/282164
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