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Intrinsic Features of Turbulent Flow in Strongly 3-D Skew Blade Passage of a Francis Turbine

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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.

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Authors and Affiliations

  1. Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming, 650051, China

    Li-xiang Zhang & Wen-quan Wang

  2. Department of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK

    Yakun Guo

Authors
  1. Li-xiang Zhang
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  2. Wen-quan Wang
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  3. Yakun Guo
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Corresponding author

Correspondence to Li-xiang Zhang.

Additional information

Project supported by the National Natural Science Foundation of China (Grant Nos. 50579025, 90210005).

Biography: ZHANG Li-xiang (1959-), Male, Ph. D., Professor

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Zhang, Lx., Wang, Wq. & Guo, Y. Intrinsic Features of Turbulent Flow in Strongly 3-D Skew Blade Passage of a Francis Turbine. J Hydrodyn 19, 92–99 (2007). https://doi.org/10.1016/S1001-6058(07)60033-X

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  • DOI: https://doi.org/10.1016/S1001-6058(07)60033-X

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