|
|
Large eddy simulation of turbulent flow around moving guide vane of adjusting hydro turbine |
Huang Jianfeng1, Zhang Lixiang1, Guo Yakun2 |
1.Department of Engineering Mechanics, Kunming University of Science and Technology, Kunming, Yunnan 650051, China; 2.School of Engineering, University of Aberdeen, Aberdeen, AB24 3UE, UK |
|
|
Abstract To investigate transient hydraulic process of upstream duct system and hydro turbine, based on the incompressible viscous Navier-Stokes equations and immersed boundary method(IBM)for moving boundary, using the dynamical subgrid stresses(SGS)on Smagorinsky-Lilly model in large eddy simulation(LES), a delicate numerical simulation of three dimensional turbulent flow around one moving guide vane of a benchmark hydro turbine unit in a channel was conducted. The distributions of the pressure and the topological structures of wake were well captured as closure of the vane. The production and evolution of the wake vortices passing the kinetic guide vane was clearly shown, and the physics of the structures were analyzed. The results show that the flow around a moving guide vane will produce numerous complex transient structure which induces water hammer of upstream duct system and transient behavior of downstream runner passage. The numerical results show that the numerical method of LES-IBM with dynamical Smagorinsky-Lilly SGS model can be used to well simulate the interaction between high Reynolds number turbulent flow with motion of the vane closure, revealing the mechanism evolution properties of the wake to the downstream in the hydro turbine adjustment process.
|
Received: 30 October 2012
|
|
|
|
[1]Zhang Lixiang, Guo Yakun, Wang Wenquan. Large eddy simulation of turbulent flow in a true 3D Francis hydro turbine passage with dynamical fluid-structure interaction[J]. International Journal for Numerical Me-thods in Fluids, 2007, 54(5):517-541.[2]Zhang Lixiang, Guo Yakun, Wang Wenquan. FEM si-mulation of turbulent flow in a turbine blade passage with dynamical fluid-structure interaction[J]. International Journal for Numerical Methods in Fluids, 2009, 61(12):1299-1330.[3]Wang W Q, He X Q, Zhang L X,et al. Strongly coupled simulation of fluid-structure interaction in a Francis hydroturbine[J]. International Journal for Numerical Methods in Fluids, 2009, 60(5):515-538.[4]黄剑峰,张立翔,姚激,等.混流式水轮机三维空化湍流场混合数值模拟[J].中国电机工程学报,2011, 31(32):115-121. Huang Jianfeng,Zhang Lixiang,Yao Ji,et al.Numerical simulation of 3D cavitation turbulent flow in Francis hydro-turbine passage on mixture modeling technology[J].Proceedings of the CSEE,2011,31(32): 115-121.(in Chinese)[5]张立翔,王文全,姚激.混流式水轮机转轮叶片流激振动分析[J].工程力学, 2007, 24(8): 143-150. Zhang Lixiang, Wang Wenquan, Yao Ji. Analysis of flow-induced vibration of blades for a Francis hydro turbine[J]. Engineering Mechanics, 2007,24(8): 143-150.(in Chinese)[6]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 3D steady and unsteady flows in whole flow passage of a Francis hydro-turbine[J]. Proceedings of the CSEE,2009,29(2):87-94.(in Chinese)[7]黄剑峰,张立翔,王文全,等.混流式水轮机三维非定常流分离涡模型的精细模拟[J]. 中国电机工程学报, 2011,31(26):83-89. Huang Jianfeng, Zhang Lixiang, Wang Wenquan, et al. Fine simulation of 3D unsteady flows in a Francis hydro-turbine on detached eddy simulation [J]. Proceedings of the CSEE, 2011, 31(26): 83-89.(in Chinese)[8]庞立军,钟苏,卜良峰,等.混流式水轮机异常噪声现场试验分析[J].振动与冲击,2012,31(14):39-42. Pang Lijun,Zhong Su, Bu Liangfeng,et al.Analysis of abnormal noise of francis turbine by scene test[J].Journal of Vibration and Shock,2012,31(14):39-42.(in Chinese)[9]钱忠东,李万.泄水锥形式对混流式水轮机压力脉动的影响分析[J].水力发电学报,2012,31(5):278-285. Qian Zhongdong, Li Wan. Analysis of pressure oscillation characteristics in Francis hydraulic turbine with different runner cones[J].Journal of Hydroelectric Engineering,2012,31(5):278-285.(in Chinese)[10]李章超,常近时,辛喆. 射水减弱混流式水轮机尾水管内压力脉动的数值模拟[J].农业机械学报,2013,44(1):53-57. Li Zhangchao,Chang Jinshi,Xin Zhe.Numerical simulation of elimination of pressure fluctuation in francis turbine draft tube using water jet[J].Transactions of the Chinese Society for Agricultural Machinery,2013,44(1):53-57.(in Chinese)[11]张兰金,王磊,任岩,等. 微型低比转数混流式水轮机的水力特性分析[J].水利水电技术,2013,44(1):128-130. Zhang Lanjin,Wang Lei,Ren Yan,et al. Analysis on hydraulic characteristics of micro Francis hydro-turbine with low specific speed[J].Water Resources and Hydropower Engineering, 2013,44(1):128-130.(in Chinese)[12]赵飞. 混流式水轮机空化流动特性分析[J].西华大学学报:自然科学版,2012,31(2):69-72. Zhao Fei.Cavitation characteristic analysis of francis turbine[J]. Journal of Xihua University:Natural Science Edition,2012,31(2):69-72.(in Chinese)[13]Guardone A, Isola D, Quaranta G. Arbitrary Lagrangian Eulerian formulation for two-dimensional flows using dynamic meshes with edge swapping[J]. Journal of Computational Physics, 2011, 230:7706-7722.[14]黄剑峰,张立翔,王文全,等.基于动网格的活动导叶流道内湍流场数值模拟[J]. 排灌机械工程学报, 2010, 28(2):140-143. Huang Jianfeng, Zhang Lixiang, Wang Wenquan, et al. Numerical simulation of turbulent flow in vane passage based on dynamical mesh technology[J]. Journal of Drainage and Irrigation Machinery Engineering, 2010, 28(2): 140-143.(in Chinese)[15]李金伟,刘树红,周大庆,等.混流式水轮机飞逸暂态过程的三维非定常湍流数值模拟[J].水力发电学报, 2009, 28(1): 178-182. Li Jinwei, Liu Shuhong, Zhou Daqing, et al. Three dimensional unsteady simulation of the runaway transient of the Francis turbine [J]. Journal of Hydroelectric Engineering, 2009, 28(1):178-182.(in Chinese)[16]Peskin C S. Flow patterns around heart valves: A numerical method [J]. Journal of Computational Physics, 1972, 10(2): 252-271.[17]Tyagi M, Acharya S. Large eddy simulation of turbulent flows in complex and moving rigid geometries using the immersed boundary method[J]. International Journal for Numerical Methods in Fluids, 2005, 48(7):691-722.[18]Liao C C, Chang Y W, Lin C A, et al. Simulating flows with moving rigid boundary using immersed-boundary method[J]. Computers and Fluids, 2010,39(8):152-167.[19]Chiu P H,Lin R K, Sheu T W H. A differentially interpolated direct forcing immersed boundary method for predicting incompressible Navier-Stokes equations in time-varying complex geometries[J]. Journal of Computational Physics,2010, 229(12):4476-4500.[20]Mittal R, Iaccarino G. Immersed boundary methods [J]. Annuai Review of Fluid Mechanics, 2005, 37:239-261. |
|
|
|