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| Large eddy simulation of transient turbulent flow in Francis turbine |
| Huang Jianfeng, Zhang Lixiang, Wang Wenquan, Yao Ji |
| （Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650051, China） |
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Abstract Numerical simulation of threedimensional transient turbulent flow in the whole flow passage of a Francis turbine based upon the Reynolds averaged N-S equations was conducted with the large eddy simulation (LES) technique on Smargorinsky model and sliding mesh technology. The steady flow data simulated with the standard k-ε model were used as the initial conditions for the unsteady simulation. The large scale structures evolving in spatially and temporally were visualized by the software Fluent 6.3, using unstructured hybridgrid and PISO algorithm. The evolution details of the large scale structures such as eddy from generate to shedding in vane cascades and blade passages were well captured at special case. The results show that LES can well simulate transient turbulent flow in a Francis turbine with complex geometry. The computational method provides some reference for exploring mechanism of eddy formation in a complex turbulent of hydraulic machinery.
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Received: 20 November 2009
Published: 30 November 2010
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| [1]于波,肖惠民.水轮机原理与运行[M].北京:中国电力出版社,2008:311-327.[2]吴玉林,刘树红,钱忠东.水力机械计算流体动力学[M].北京:中国水利水电出版社,2007:183-203.[3]李琪飞,李仁年,韩伟,等.蜗壳内部含沙水两相流动的CFD模拟分析[J].排灌机械,2007,25(5):61-64.Li Qifei,Li Rennian,Han Wei,et al.CFD simulation of sand-water two-phase inner flow field of volute[J].Drainage and Irrigation Machinery,2007,25 (5):61-64.(in Chinese)[4]Roland Bouffanais.Advances and challenges of applied large-eddy simulation[J].Computers & Fluids,2010,39(5):735-738.[5]Karabelas S J.Large eddy simulation of high-Reynolds number flow past a rotating cylinder[J].International Journal of Heat and Fluid Flow,2010,31(4):518-527.[6]Song C,Chen X Y,He J,et al.Using computational tools for hydraulic design of hydropower plants[J].Hydro Review,1995,14(4):114-121.[7]ChenXiangying,等.采用大涡模拟方法对混流式水轮机系统进行综合模拟[J].国外大电机,2001(1):64-67.Chen Xiangying,et al.Comprehensive simulation of a Francis hydro turbine system based on large eddy simulation technique[J].Guowai Dadianji,2001(1):64-67.(in Chinese)[8]杨建明,刘文俊,吴玉林.用大涡模拟方法计算尾水管内非定常周期性湍流[J].水利学报,2001(8):79-84.Yang Jianming,Liu Wenjun,Wu Yulin.The large eddy simulation method for computation of 3-D unsteady periodic turbulent flow in draft tube[J].Journal of Hydraulic Engineering,2001(8):79-84.(in Chinese)[9]Wang Wenquan,Zhang Lixiang,Yan Yan.Large eddy simulation of turbulent flow considering inflow wakes in a Francis turbine blade passage[J].Journal of Hydrodynamics,2007,19(2):201-209.[10]黄剑峰,张立翔,何士华.混流式水轮机全流道三维定常及非定常流数值模拟[J].中国电机工程学报,2009,29(2):87-94.Huang Jianfeng,Zhang Lixiang,He Shihua.Numerical simulation of 3-D steady and unsteady flows in whole flow passage of a Francis hydro-turbine[J].Procee-dings of the CSEE,2009,29(2):87-94.(in Chinese)[11]Smagorinsky J.General circulation experiments with the primitive equations-Ⅰ:The basic experiment[J].Monthly Weather Review,1963,91(3):99-165. |
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