Cavitation surge in a small model test facility simulating a hydraulic power plant

Koichi Yonezawa*, Daisuke Konishi, Kazuyoshi Miyagawa, François Avellan, Peter Doerfler, Yoshinobu Tsujimoto

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Model tests and CFD were carried out to find out the cause of cavitation surge in hydraulic power plants. In experiments the cavitation surge was observed at flow rates higher and lower than the swirl free flow rate, both with and without a surge tank placed just upstream of the inlet volute. The surge frequency at smaller flow rate was much smaller than the swirl mode frequency caused by the whirl of vortex rope. An unsteady CFD was carried out with two boundary conditions: (1) the flow rate is fixed to be constant at the volute inlet, (2) the total pressure is kept constant at the volute inlet, corresponding to the experiments without/with the surge tank. The surge was observed with both boundary conditions at both higher and lower flow rates. Discussions as to the cause of the surge are made based on additional tests with an orifice at the diffuser exit, and with the diffuser replaced with a straight pipe.

Original languageEnglish
Pages (from-to)152-160
Number of pages9
JournalInternational Journal of Fluid Machinery and Systems
Issue number4
Publication statusPublished - 2012


  • Cavitation
  • Draft tube surge
  • Hydro turbine

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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