대한기계학회논문집B (Transactions of the Korean Society of Mechanical Engineers B)

  • 제25권1호
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  • Pages.71-77
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  • 2001
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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평판에 고정된 유한 실린더 상면표면 주위에 형성되는 와류유동의 가시화

Visualization of Vortical Flow Around the Free End Surface of a Finite Circular Cylinder Mounted on a Flat Plate

  • 발행 : 2001.01.01
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초록

A flow visualization study using the oil film method and the smoke-laser light sheet arrangement is carried out to investigate the three-dimensional flow pattern around the free end surface region of a finite circular cylinder (aspect ratios of 1.25 and 4.25) mounted on a flat plate. The experiment is performed for the cases of two Reynolds numbers: 5.92${\times}$10$^3$and 1.48${\times}$10(sup)5. Various kinds of singular points on the free-end surface are disclosed from the oil surface flow visualization. The smoke-laser light sheet visualization, to aid in understanding the oil streak-line patterns, clearly demonstrates that a pair of tornado-like vortices marched along the downstream together with a pair of side tip vortices. A topological sketch to characterize the surface flow and the four vortices emanating from the top surface is included.

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참고문헌

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