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Article

CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models

1
Institute of Systems Engineering, University of Applied Sciences and Arts Western Switzerland Valais, Route du Rawil 47, CH-1950 Sion, Switzerland
2
Kraftwerke Oberhasli AG (KWO), Grimsel Hydro, CH-3862 Innertkirchen, Switzerland
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(12), 2505; https://doi.org/10.3390/app8122505
Received: 1 November 2018 / Revised: 23 November 2018 / Accepted: 27 November 2018 / Published: 5 December 2018
(This article belongs to the Special Issue Radial Turbomachinery Aerodynamics)
Due to the integration of new renewable energies, the electrical grid undergoes instabilities. Hydroelectric power plants are key players for grid control thanks to pumped storage power plants. However, this objective requires extending the operating range of the machines and increasing the number of start-up, stand-by, and shut-down procedures, which reduces the lifespan of the machines. CFD based on standard URANS turbulence modeling is currently able to predict accurately the performances of the hydraulic turbines for operating points close to the Best Efficiency Point (BEP). However, far from the BEP, the standard URANS approach is less efficient to capture the dynamics of 3D flows. The current study focuses on a hydraulic turbine, which has been investigated at the BEP and at the Speed-No-Load (SNL) operating conditions. Several “advanced” URANS models such as the Scale-Adaptive Simulation (SAS) SST k ω and the BSL- EARSM have been considered and compared with the SST k ω model. The main conclusion of this study is that, at the SNL operating condition, the prediction of the topology and the dynamics of the flow on the suction side of the runner blade channels close to the trailing edge are influenced by the turbulence model. View Full-Text
Keywords: CFD; URANS; Francis turbine; speed-no-load; scale-adaptive simulation; EARSM CFD; URANS; Francis turbine; speed-no-load; scale-adaptive simulation; EARSM
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MDPI and ACS Style

Decaix, J.; Hasmatuchi, V.; Titzschkau, M.; Münch-Alligné, C. CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models. Appl. Sci. 2018, 8, 2505. https://doi.org/10.3390/app8122505

AMA Style

Decaix J, Hasmatuchi V, Titzschkau M, Münch-Alligné C. CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models. Applied Sciences. 2018; 8(12):2505. https://doi.org/10.3390/app8122505

Chicago/Turabian Style

Decaix, Jean, Vlad Hasmatuchi, Maximilian Titzschkau, and Cécile Münch-Alligné. 2018. "CFD Investigation of a High Head Francis Turbine at Speed No-Load Using Advanced URANS Models" Applied Sciences 8, no. 12: 2505. https://doi.org/10.3390/app8122505

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