Interaction of a pulsating vortex rope with the local velocity field in a Francis turbine draft tube

A. Müller*, A. Bullani, M. Dreyer, S. Roth, A. Favrel, C. Landry, F. Avellan

*この研究の対応する著者

研究成果: Conference article査読

12 被引用数 (Scopus)

抄録

Acoustic resonances in Francis turbines often define undesirable limitations to their operating ranges at high load. The knowledge of the mechanisms governing the onset and the sustenance of these instabilities in the swirling flow leaving the runner is essential for the development of a reliable hydroacoustic model for the prediction of system stability. The present work seeks to study experimentally the unstable draft tube flow by conducting a series of measurements on a reduced Francis Turbine model. The key physical parameters and their interaction with the hydraulic and mechanical system are studied and quantified. In particular, the evolution of the axial and tangential velocity components in the draft tube cone is analysed by means of Laser Doppler Anemometry. Combined with the calculation of the instantaneous vortex rope volume based on flow visualization and the measurement of the pressure fluctuations, the nature of the auto-oscillation in the draft tube flow is investigated.

本文言語English
論文番号032040
ジャーナルIOP Conference Series: Earth and Environmental Science
15
PART 3
DOI
出版ステータスPublished - 2012
外部発表はい
イベント26th IAHR Symposium on Hydraulic Machinery and Systems - Beijing, China
継続期間: 2012 8月 192012 8月 23

ASJC Scopus subject areas

  • 環境科学一般
  • 地球惑星科学一般

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