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

K. Yamamoto, A. Müller, A. Favrel, C. Landry, F. Avellan

研究成果: Conference article査読

15 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号082005
ジャーナルIOP Conference Series: Earth and Environmental Science
49
8
DOI
出版ステータスPublished - 2016 12月 13
外部発表はい
イベント28th IAHR Symposium on Hydraulic Machinery and Systems, IAHR 2016 - Grenoble, France
継続期間: 2016 7月 42016 7月 8

ASJC Scopus subject areas

  • 環境科学(全般)
  • 地球惑星科学(全般)

フィンガープリント

「Numerical and experimental evidence of the inter-blade cavitation vortex development at deep part load operation of a Francis turbine」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル