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Large Eddy Simulation of the Rotating Stall in a Pump-Turbine Operated in Pumping Mode at a Part-Load Condition
Journal article

Large Eddy Simulation of the Rotating Stall in a Pump-Turbine Operated in Pumping Mode at a Part-Load Condition

  • Pacot, Olivier Institute of Industrial Science (IIS), The University of Tokyo, Tokyo 153-8505, Japan e-mail:
  • Kato, Chisachi Professor Institute of industrial Science (IIS), The University of Tokyo, Tokyo 153-8505, Japan e-mail:
  • Guo, Yang Institute of industrial Science (IIS), The University of Tokyo, Tokyo 153-8505, Japan e-mail:
  • Yamade, Yoshinobu Institute of industrial Science (IIS), The University of Tokyo, Tokyo 153-8505, Japan e-mail:
  • Avellan, François Professor École polytechnique fédérale de Lausanne (EPFL), Laboratory for Hydraulic Machines, Avenue de Cour 33bis, Lausanne CH-1007, Switzerland e-mail:
  • 2016-7-15
Published in:
  • Journal of Fluids Engineering. - ASME International. - 2016, vol. 138, no. 11
Mechanical Engineering
English The investigation of the rotating stall phenomenon appearing in the HYDRODYNA pump-turbine reduced scale model is carried out by performing a large-scale large eddy simulation (LES) computation using a mesh featuring approximately 85 × 106 elements. The internal flow is computed for the pump-turbine operated at 76% of the best efficiency point (BEP) in pumping mode, for which previous experimental research evidenced four rotating stall cells. To achieve an adequate resolution near the wall, the Reynolds number is decreased by a factor of 25 than that of the experiment, by assuming that the flow of our interest is not strongly affected by the Reynolds number. The computations are performed on the supercomputer PRIMEHPC FX10 of the University of Tokyo using the overset finite-element open source code FrontFlow/blue with the dynamic Smagorinsky turbulence model. It is shown that the rotating stall phenomenon is accurately simulated using the LES approach. The results show an excellent agreement with available experimental data from the reduced scale model tested at the EPFL Laboratory for hydraulic machines. The number of stall cells as well as the propagation speed agree well with the experiment. Detailed investigations on the computed flow fields have clarified the propagation mechanism of the stall cells.
Language
  • English
Open access status
closed
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https://sonar.ch/global/documents/294697
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