Visualization of the elliptical form of a cavitation vortex rope and its collapse by two cameras

A. Favrel, Z. Liu, W. Takahashi, T. Irie, M. Kubo, K. Miyagawa

研究成果: Conference article査読

1 被引用数 (Scopus)

抄録

This article presents preliminary results of an experimental study of the upper-part load instability and the associated elliptical form of the cavitation vortex rope in a Francis turbine draft tube. The influence of the operating parameters on the onset and the development of the instability is first briefly studied by pressure measurements in the draft tube. Visualizations of the cavitation vortex rope and its associated elliptical form are performed by using two synchronized high-speed cameras spaced by an angle of 90°. This allows to reconstruct the instantaneous position of the vortex center along the draft tube. It is confirmed that using a single camera leads to biased estimations of the cavitation volume fluctuations. The breathing behaviour of the vortex rope, responsible for the pressure pulsations according to several authors, cannot be definitely demonstrated without a proper reconstruction of the vortex shape based on high-speed videos from several positions. Finally, unique intermittent collapses of cavitation in the vortex center, giving rise to two distinct cavities connecting on both sides the vortex rope, are highlighted.

本文言語English
論文番号012035
ジャーナルIOP Conference Series: Earth and Environmental Science
405
1
DOI
出版ステータスPublished - 2019 12 20
イベント8th IAHR International Workshop on Cavitation and Dynamic Problems in Hydraulic Machinery and Systems, IAHR 2019 - Stuttgart, Germany
継続期間: 2019 10 92019 10 11

ASJC Scopus subject areas

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

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