LARGE-EDDY SIMULATION OF TURBULENT FLOW CONSIDERING INFLOW WAKES IN A FRANCIS TURBINE BLADE PASSAGE

被引:0
作者
WANG WenquanZHANG LixiangYAN Yan Department of Engineering MechanicsKunming University of Science and TechnologyKunming China GUO Yakun Department of EngineeringUniversity of AberdeenAberdeen AB UEUK [650051 ,24 ,3 ]
机构
关键词
Large Eddy Simulation (LES); turbulent flow; numerical simulation; wakes; Francis hydro turbine;
D O I
暂无
中图分类号
O357.5 [湍流(紊流)]; O242 [数学模拟、近似计算]; TV131 [水力理论、计算、实验];
学科分类号
080103 ; 080704 ; 070102 ; 0801 ; 080104 ; 081502 ;
摘要
Turbulent flow in a 3-D blade passage of a Francis hydro turbine was simulated with the Large Eddy Simulation (LES) to investigate the spatial and temporal distributions of the turbulence when strongly distorted wakes in the inflow sweep over the passage. In a suitable consideration of the energy exchanging mechanism between the large and small scales in the complicated passage with a strong 3-D curvature,one-coefficient dynamic Sub-Grid-Scale (SGS) stress model was used in this article. The simulations show that the strong wakes in the inflow lead to a flow separation at the leading zone of the passage,and to form a primary vortex in the span-wise direction. The primary span-wise vortex evolves and splits into smaller vortex pairs due to the constraint of no-slip wall condition,which triggers losing stability of the flow in the passage. The computed pressures on the pressure and suction sides agree with the measured data for a working test turbine model.
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页码:201 / 209
页数:9
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