Intrinsic features of turbulent flow in strongly 3-D skew blade passage of a francis turbine

L. X. Zhang, W. Q. Wang, Yakun Guo

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The turbulent flow, with the Reynolds number of 5.9 × 105, in the strongly 3-D skew blade passage of a true Francis hydro turbine was simulated by the Large Eddy Simulation (LES) approach to investigate the spatial and temporal distributions of the fully developed turbulence in the passage with strongly 3-D complex geometry. The simulations show that the strong three-dimensionality of the passage has a great amplification effect on the turbulence in the passage, and the distributions of the turbulence are diversely nonuniform, for instance, the rise of turbulent kinetic energy in the lower 1/3 region of the passage is more than 45%, whereas its rise in the upper 1/3 region is less than 1%. With the LES approach, the details of the flow structures at the near-wall surfaces of the blades could be obtained. Several turbulent spots were captured.
Original languageEnglish
Pages (from-to)92-99
Number of pages8
JournalJournal of Hydrodynamics, Series B
Volume19
Issue number1
DOIs
Publication statusPublished - Feb 2007

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