vortex street, small Reynolds number, hydraulic test tunnel, circular cylinder, hot-wire velocimeter, vortex shedding, digital camera, hydrogen bubble chamber, velocity fluctuation, research and development, forced vibration, Strouhal number
その他のタイトル（英）
Formation of vortex street at small Reynolds numbers
Institute of Flow Research
Institute of Flow Research
Institute of Flow Research
出版者
航空宇宙技術研究所
出版者（英）
National Aerospace Laboratory (NAL)
雑誌名
航空宇宙技術研究所特別資料: 境界層遷移の解明と制御研究会講演論文集 第29回・第30回
雑誌名(英)
Special Publication of National Aerospace Laboratory: Proceedings of the 29th and 30th NAL Workshops on Investigation and Control of Boundary-Layer Transition
巻
56
ページ
23 - 26
発行年
2002-12
抄録（英）
Experiments were carried out in a small water tunnel. The formation of vortex street behind cylinders was investigated in Reynolds number range from 20 to 100 by the simultaneous use of hydrogen bubble technique and hot-wire velocimeter. The boundary Reynolds number which is the smallest Reynolds number with vortex shedding was determined experimentally. The value is about 40. The Strouhal number, which is the nondimensional frequency of vortex shedding is around 0.13 at small Reynolds numbers. Because they are sensitive to a weak fluctuation in the flow, the precise values can not be determined.
小さいレイノルズ数での渦列の形成
nalsp0056007.pdf
(6.5MB)
