Numerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine

K. Yamamoto, A. M�ller, Arthur Tristan Favrel, C. Landry, F. Avellan

Research output: Contribution to journalConference article

3 Citations (Scopus)

Abstract

Francis turbines are subject to various types of the cavitation flow depending on the operating conditions. In order to compensate for the stochastic nature of renewable energy sources, it is more and more required to extend the operating range of the generating units, from deep part load to full load conditions. In the deep part load condition, the formation of cavitation vortices in the turbine blade to blade channels called inter-blade cavitation vortex is often observed. The understanding of the dynamic characteristics of these inter-blade vortices and their formation mechanisms is of key importance in an effort of developing reliable flow simulation tools. This paper reports the numerical and experimental investigations carried out in order to establish the vortex characteristics, especially the inception and the development of the vortex structure. The unsteady RANS simulation for the multiphase flow is performed with the SST- SAS turbulence model by using the commercial flow solver ANSYS CFX. The simulation results in terms of the vortex structure and the cavitation volume are evaluated by comparing them to the flow visualizations of the blade channel acquired through a specially instrumented guide vane as well as from the downstream of the runner across the draft tube cone. The inter-blade cavitation vortex is successfully captured by the simulation and both numerical and experimental results evidence that the inter-blade vortices are attached to the runner hub.

Original languageEnglish
Article number082005
JournalIOP Conference Series: Earth and Environmental Science
Volume49
Issue number8
DOIs
Publication statusPublished - 2016 Dec 13
Externally publishedYes
Event28th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2016 - Grenoble, France
Duration: 2016 Jul 42016 Jul 8

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cavitation
turbine
vortex
simulation
multiphase flow
formation mechanism
visualization
sea surface temperature
turbulence

ASJC Scopus subject areas

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

Cite this

Numerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine. / Yamamoto, K.; M�ller, A.; Favrel, Arthur Tristan; Landry, C.; Avellan, F.

In: IOP Conference Series: Earth and Environmental Science, Vol. 49, No. 8, 082005, 13.12.2016.

Research output: Contribution to journalConference article

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