Analysis of the part load helical vortex rope of a Francis turbine using on-board sensors

F. Duparchy, A. Favrel, P. Y. Lowys, C. Landry, A. Müller, K. Yamamoto, F. Avellan

Research output: Contribution to journalConference articlepeer-review

21 Citations (Scopus)


The cavitation helical vortex rope arising at Francis turbine partial load induces pressure fluctuations at the rope precession frequency, which can be decomposed into two components; the convective one and the synchronous one. The latter acts as an excitation source for the hydraulic system and is amplified in case of resonance. The present paper aims to highlight the impact of both components on the mechanical behaviour of the runner by performing on-board measurements. It is shown that the use of on-board pressure sensors enables to naturally separate the components of the pressure fluctuations. In addition, the synchronous component has little impact on the mechanical behaviour of the runner, even for the case in which hydro-acoustic resonance occurs.

Original languageEnglish
Article number012061
JournalJournal of Physics: Conference Series
Issue number1
Publication statusPublished - 2015 Dec 3
Externally publishedYes
Event9th International Symposium on Cavitation, CAV 2015 - Lausanne, Switzerland
Duration: 2015 Dec 62015 Dec 10

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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