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titleOn the critical Reynolds number of the drag coefficient for a circular cylinder
Other TitleOn the critical Reynolds number of the drag coefficient for a circular cylinder
Author(jpn)松井 辰彌
Author(eng)Matsui, Tatsuya
Author Affiliation(jpn)岐阜大学 工学部 機械工学科
Author Affiliation(eng)Gifu University Department of Mechanical Engineering, Faculty of Engineering
Issue Date2008-02-29
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title境界層遷移の解明と制御研究会講演論文集 第40回
Proceedings of the 40th JAXA Workshop on Investigation and Control of Boundary-Layer Transition
Start page39
End page40
Publication date2008-02-29
AbstractDrag coefficient of a circular cylinder in a uniform flow shows a steep fall when the Reynolds number increases from about 3.0 x 10(exp 5) to about 3.8 x 10(exp 5) in our experiments. At about Re = 3.6 x 10(exp 5), the drag coefficient curve is not continuous, but has a jump, and also a lift force actually acts on the cylinder. This phenomenon results from the sudden and asymmetric appearance of separation bubbles on both sides of the circular cylinder. The asymmetric formation of separation bubbles is the origin of lift. The Reynolds number, Re = 3.6 x 10(exp 5), is appropriately called the critical Reynolds number for the drag coefficient of a circular cylinder.
DescriptionJAXA Special Publication
Keywordscircular cylinder; uniform flow; critical Reynolds number; aerodynamic drag; drag measurement; pressure distribution; separated flow; boundary layer separation; separation bubble; lift; turbulent boundary layer; 円筒; 一様流; 臨界レイノルズ数; 空力抵抗; 抗力測定; 圧力分布; 剥離流; 境界層剥離; 剥離泡; 揚力; 乱流境界層
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-026E

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