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ON SEPARATED SHEAR LAYER OF BLUNT CIRCULAR CYLINDER

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【Author】 Dong Yufei;Wei Zhonglei;Xu Cheng;Jiang Xiaoqin;Liao Yufeng State Key Laboratory for Turbulence Research, Department of Mechanics, Peking University, Beijing 100871, China Institute of Mechanics, Chinese Academy of Sciences, Beijing 100080, China School of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China Navy Academy of Engineering, Wuhan 430033, China

【机构】 State Key Laboratory for Turbulence Research, Department of Mechanics, Peking University, Beijing 100871, China Institute of Mechanics, Chincse Academy of Sciences, Beijing 100080, China； State Key Laboratory for Turbulence Research, Department of Mechanics, Peking University, Beijing 100871, China； School of Mechanical Engineering, Nanjing University of Science & Technology, Nanjing 210094, China； Navy Academy of Engineering, Wuhan 430033, China；

【摘要】 <正> Separated shear layer of blunt circular cylinder has been experimen-tally investigated for the Reynolds numbers (based on the diameter) ranging from2.8×10~3 to 1.0×10~5, with emphasis on evolution of separated shear layer, its struc-ture and distribution of Reynolds shear stress and turbulence kinetic energy. Theresults demonstrate that laminar separated shear layer experiences 2～3 times vor-tex merging before it reattaches, and turbulence separated shear layer takes 5～6times vortex merging. In addition, relationship between dimensionless initial frequen-cies of K-H instability and Reynolds numbers is identified, and reasons for the decayof turbulence kinetic energy and Reynolds shear stress in reattachment region arediscussed.更多还原

【Abstract】 Separated shear layer of blunt circular cylinder has been experimen- tally investigated for the Reynolds numbers (based on the diameter) ranging from 2.8×10~3 to 1.0×10~5, with emphasis on evolution of separated shear layer, its struc- ture and distribution of Reynolds shear stress and turbulence kinetic energy. The results demonstrate that laminar separated shear layer experiences 2～3 times vor- tex merging before it reattaches, and turbulence separated shear layer takes 5～6 times vortex merging. In addition, relationship between dimensionless initial frequen- cies of K-H instability and Reynolds numbers is identified, and reasons for the decay of turbulence kinetic energy and Reynolds shear stress in reattachment region are discussed.更多还原

【关键词】 blunt circular cylinder； separated flow； shear layer； K-H instability；
【Key words】 blunt circular cylinder； separated flow； shear layer； K-H instability；

【基金】 The proJect supported by the National Natural Science Foundation of China;the Key Laboratory for Hydrodynamics of NDCST

【文献出处】 Acta Mechanica Sinica ,力学学报(英文版) , 编辑部邮箱 ,1997年04期

【分类号】O357.5
【被引频次】1
【下载频次】12

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