Unsteady hydraulic simulation of the cavitating part load vortex rope in Francis turbines

J. Brammer, C. Segoufin, F. Duparchy, P. Y. Lowys, A. Favrel, F. Avellan

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

For Francis turbines at part load operation a helical vortex rope is formed due to the swirling nature of the flow exiting the runner. This vortex creates pressure fluctuations which can lead to power swings, and the unsteady loading can lead to fatigue damage of the runner. In the case that the vortex rope cavitates there is the additional risk that hydro-acoustic resonance can occur. It is therefore important to be able to accurately simulate this phenomenon to address these issues. In this paper an unsteady, multi-phase CFD model was used to simulate two part-load operating points, for two different cavitation conditions. The simulation results were validated with test-rig data, and showed very good agreement. These results also served as an input for FEA calculations and fatigue analysis, which are presented in a separate study.

Original languageEnglish
Article number012020
JournalJournal of Physics: Conference Series
Volume813
Issue number1
DOIs
Publication statusPublished - 2017 Apr 4
Externally publishedYes
EventHYdropower Plants PERformance and FlexiBle Operation Towards Lean Integration of New Renewable Energies Symposium, HYPERBOLE 2017 - Porto, Portugal
Duration: 2017 Feb 22017 Feb 3

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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