Waseda Research Institute for Science and Engineering早稲田大学 理工学術院総合研究所

プロジェクト研究

水車ドラフトチューブ内旋回流によるサージング及び渦芯振れ回りによる圧力脈動現象の解明によるモデル化のための実験と理論的アプローチ

Experimental and theoretical approaches for understanding and modelling cavitation draft tube surge and vortex-induced pressure excitation sources in swirling flows in hydro turbines
  • 研究番号:19C10
  • 研究部門:technology
  • 研究種別:奨励研究
  • 研究期間:2019年04月〜2020年03月

代表研究者

ファヴレル、アーチャ・トリスタン 理工総研が募集する次席研究員
FAVREL, Arthur Tristan Researcher

理工学術院総合研究所 宮川和芳研究室
Research Institute for Science and Engineering

研究概要

Hydraulic turbines operating in off-design conditions may experience two types of draft tube flow instabilities: 

  • Cavitation surge at full load, characterized by self-excited oscillations of a axisymmetric cavitation vortex inducing severe pressure pulsations; 
  • Vortex-induced pressure source, inducing pressure pulsations and resonance in certains conditions. 

The latter is induced by a precessing vortex core occurring in swirling flows after vortex breakdown. This phenomenon is encountered in a wide range of engineering applications involving swirling flows and the results of the proposed research might attract attention of researchers in the fields of fundamental swirling flow dynamics.  

   Following my backgroung and previous researches, this research plan proposes to investigate both phenomena from an experimental and theoretical point of view. It is proposed to take advantage of the experimental facilities of Waseda University (i.e. simple air draft tube with swirlers, Venturi water draft tube with swirlers and Francis turbine reduced scale model) and to upgrade them to enable advanced optical flow measurements, such as stereo Particle Image Velocimetry and Laser Doppler Velcometry, and a new type of cavitation visualization based on two cameras, which will be developped in the present research. The final objective is to gain a better understanding of the underlying physical mechanisms involved in both phenomena, to develop more accurate models enabling the prediction of flow instabilities dynamics and the induced effects, i.e. pressure and flow rate fluctuations, and finally to propose counter-measures mitigating these instabilities, based on a precise understanding of the underlying physical mechanisms.  

年次報告

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