INTRINSIC FEATURES OF TURBULENT FLOW IN STRONGLY 3-D SKEW BLADE PASSAGE OF A FRANCIS TURBINE |
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Authors: | ZHANG Li-xiang WANG Wen-quan GUO Yakun |
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Affiliation: | 1. Division of Combustion Physics, Lund University, 22100 Lund, Sweden;2. Division of Fluid Mechanics, Lund University, 22100 Lund, Sweden |
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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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Keywords: | turbulent flow Large Eddy Simulation (LES) hydro turbine |
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