INTRINSIC FEATURES OF TURBULENT FLOW IN STRONGLY 3-D SKEW BLADE PASSAGE OF A FRANCIS TURBINE  

作　　者：ZHANG Li-xiang WANG Wen-quan GUO Yakun 

机构地区：[1]Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming 650051, China [2]GUO Yakun Department of Engineering, University of Aberdeen, Aberdeen AB24 3UE, UK.

出　　处：《Journal of Hydrodynamics》2007年第1期92-99,共8页水动力学研究与进展B辑（英文版）

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

摘　　要：The turbulent flow, with the Reynolds number of 5.9×10^5, 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.The turbulent flow, with the Reynolds number of 5.9×10^5, 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.

关 键 词：turbulent flow Large Eddy Simulation （LES） hydro turbine 

分 类 号：TK730.2[交通运输工程—轮机工程] TK733.7[动力工程及工程热物理—流体机械及工程]