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Flow, Turbulence and Combustion
Published in: Flow, Turbulence and Combustion 4/2016

16-09-2016

Analysis of Head Losses in a Turbine Draft Tube by Means of 3D Unsteady Simulations

Authors: Sylvia Wilhelm, Guillaume Balarac, Olivier Métais, Claire Ségoufin

Published in: Flow, Turbulence and Combustion | Issue 4/2016

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Abstract

In this paper, Unsteady RANS (URANS) simulations and Large Eddy Simulations (LES) in the draft tube of a bulb turbine are presented with the objective to understand and locate the head losses in this turbine component. Three operating points of the turbine are considered. Numerical results are compared with experimental velocity measurements for validation. Thanks to a detailed analysis of the energy balance in the draft tube, the physical and hydrodynamic phenomena responsible for head losses in the draft tube are identified. Head losses are due to transfer of mean kinetic energy to the turbulent flow and viscous dissipation of kinetic energy. This occurs mainly in the central vortex structure and next to the walls in the draft tube. Head losses prediction is found to be dependent on the turbulence model used in the simulations, especially in URANS simulations. Using this analysis, the evolution of head losses between the three operating points is understood.
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Appendix
Available only for authorised users
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Metadata
Title
Analysis of Head Losses in a Turbine Draft Tube by Means of 3D Unsteady Simulations
Authors
Sylvia Wilhelm
Guillaume Balarac
Olivier Métais
Claire Ségoufin
Publication date
16-09-2016
Publisher
Springer Netherlands
Published in
Flow, Turbulence and Combustion / Issue 4/2016
Print ISSN: 1386-6184
Electronic ISSN: 1573-1987
DOI
https://doi.org/10.1007/s10494-016-9767-9

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