On the Critical Geometry of a Ring in Flow.
Bibliographic Information
- Other Title
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- 流れのなかに置かれたリングの臨界断面
- ナガレ ノ ナカ ニ オカレタ リング ノ リンカイ ダンメン
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Abstract
The present aim is to clarify the streamwise thickness effect of a ring with rectangular cross sections, which is immersed perpendicularly to uniform flow. In a wind tunnel, we carried out measurements using a pressure transducer and a hot wire anemometer, and flow visualisations by a somke wire method, for Re=5.0×(10)3-1.5×(10)4, d/ω-4.0-8.0, and t/ω=0.29-1.30, where d. ω and t are mean diameter, cross section width and cross section thickness of the ring, respectively. Consequently, Strouhal number St, which is a reduced frequency of regular vortex shedding from the ring, is independent of t/ω, d/ω and Re. On the other hand, we can observe the maximum base suction and the maximum drag at a certain critical value of t/ω, depending on d/ω. We can clearly classify flow into two modes, viz., sub and over critical modes. Round the critical is a transition range of the modal shift. Over critical leeward extension of the after body drastically enhances the formation of vortex rings, and weakens a ring curvature effect. Only the existence of an inner sidewall is essential for the modal shift.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 67 (664), 3101-3109, 2001
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390001206184757888
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- NII Article ID
- 130004080568
- 110002403441
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- NII Book ID
- AN00187441
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- ISSN
- 18848346
- 03875016
- http://id.crossref.org/issn/03875016
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- NDL BIB ID
- 6019973
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed