書誌事項
- タイトル別名
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- On the Critical Geometry of a Ring in Flow.
- 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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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.
収録刊行物
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- 日本機械学会論文集Ｂ編
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日本機械学会論文集Ｂ編 67 (664), 3101-3109, 2001
一般社団法人 日本機械学会
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詳細情報 詳細情報について
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- CRID
- 1390001206184757888
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- NII論文ID
- 130004080568
- 110002403441
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- NII書誌ID
- AN00187441
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- ISSN
- 18848346
- 03875016
- http://id.crossref.org/issn/03875016
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- NDL書誌ID
- 6019973
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可