| INTRINSIC FEATURES OF TURBULENT FLOW IN STRONGLY 3-D SKEW BLADE PASSAGE OF A FRANCIS TURBINE |
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| 作者单位： | ZHANG Li-xiang，WANG Wen-quan Department of Engineering Mechanics，Kunming University of Science and Technology，Kunming 650051，China，GUO Yakun Department of Engineering，University of Aberdeen，Aberdeen AB24 3UE，UK. |
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| 摘 要： | 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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| 关 键 词： | 水轮机 三维扭斜叶片 流道 湍流 固有特征 大涡旋模拟 |
| 收稿时间： | 2005-11-15 |
| 修稿时间： | 2006-02-16 |
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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