| EXPERIMENTAL STUDY OF FLOW STRUCTURE BEHIND A CIRCULAR CYLINDER WITH WAVY SURFACE BY PIV |
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| 作者姓名： | ZHANG Wei Daichin |
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| 作者单位： | Shanghai Institute |
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| 摘 要： | 1. INTRODUCTIONThe flow around a s mooth circular cylinderhas been extensively studied by many researchers ,as can be seen fromthe comprehensive reviews ofWilliamson1]and Rockwell2]. Wang et al .3]in-vestigated the 3D flow structure behind a circularcy…
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| 关 键 词： | 波状柱面 尾流结构 PIV 空间分布 光滑柱面 |
| 收稿时间： | 2005-05-23 |
EXPERIMENTAL STUDY OF FLOW STRUCTURE BEHIND A CIRCULAR CYLINDER WITH WAVY SURFACE BY PIV |
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| ZHANG Wei Daichin.EXPERIMENTAL STUDY OF FLOW STRUCTURE BEHIND A CIRCULAR CYLINDER WITH WAVY SURFACE BY PIV[J].Journal of Hydrodynamics,2006,18(1):97-103. |
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| Authors: | ZHANG Wei Daichin |
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| Abstract: | The wake behind a circular cylinder with wavy surface was investigated using single-frame PIV technique at Re=5200. The mean flow field and spatial distribution of turbulence statistics in the nodal, saddle and middle planes were presented and compared with those of a smooth cylinder. The near wake behind the wavy cylinder shows pronounced spanwise periodicity of flow structures. Compared with a smooth cylinder, the vortex formation region considerably expands in the streamwise direction, particularly reaching maximum in the saddle plane of the wavy cylinder. However, the longitudinal vortices in the nodal plane were noticeably suppressed in the transverse direction. In addition, the wake in the nodal plane contains the peak value of turbulent kinetic energy and the Reynolds shearing stress due to the intensive entrainment of free flow and the momentum exchange in the spanwise direction. |
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| Keywords: | wavy cylinder wake structure PIV |
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