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Analysis of head losses in a turbine draft tube by means of 3D unsteady simulations

S. Wilhelm
Grenoble-INP/CNRS/UJF-Grenoble 1, LEGI UMR 5519, Grenoble, F-38041, France; Alstom Hydro France, 82 avenue Léon Blum, Grenoble, 38041, France

Guillaume Balarac
Grenoble-INP/CNRS/UJF-Grenoble 1, LEGI UMR 5519, Grenoble, F-38041, France

Olivier Metais
Grenoble-INP/CNRS/UJF-Grenoble 1, LEGI UMR 5519, Grenoble, F-38041, France

C. Segoufin
Alstom Hydro France, 82 avenue Leon Blum, Grenoble, 38041, France

Sinopsis

URANS simulations and LES in the draft tube of a bulb turbine are presented with the objective to understand the head losses in this turbine component. Numerical results are compared with experimental velocity measurements. The velocity profiles prediction is slightly better with LES than with URANS simulations but the mesh for LES has to be refined to improve the accuracy of the results. Thanks to a detailed analysis of the energy balance in the draft tube, head losses were located in the central vortex structure and next to the walls.

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