@inproceedings{oai:jaxa.repo.nii.ac.jp:00004893, author = {福西, 祐 and 鈴木, 芳宗 and 茂田, 正哉 and 伊澤, 精一郎 and Fukunishi, Yu and Suzuki, Yoshimune and Shigeta, Masaya and Izawa, Seiichiro}, book = {宇宙航空研究開発機構特別資料: 「境界層遷移の解明と制御」研究会講演論文集(第43回・第44回), JAXA Special Publication: Proceedings of the 43rd and 44th JAXA Workshops on "Investigation and Control of Boundar-Layer Transition"}, month = {Feb}, note = {第43回(2008年10月2日-10月3日)「境界層遷移の解明と制御」研究会; 第44回(2009年3月26日-3月27日)「境界層遷移の解明と制御」研究会, 43rd JAXA Workshops on "Investigation and Control of Boundar-Layer Transition" (October 2-3, 2008) ; 44th JAXA Workshops on "Investigation and Control of Boundar-Layer Transition" (March 26-27, 2009), The effect of a localized disturbance outside a boundary layer on the transition is investigated by a wind-tunnel experiment. The disturbance is introduced by a turbulence generator which consists of two vortex-ring-generating units arranged face to face along the spanwise direction in the freestream. Each vortex-ring-generating unit issues intermittent jets that soon roll up into vortex rings. The two rings each from a vortex-ring-generating unit collide outside the boundary layer generating a velocity fluctuation pattern of high-speed and low-speed regions, with the high-speed region on the downstream side. An opposite pattern appears inside the boundary layer near the wall. In the high-speed region inside the boundary layer, a generation and a growth of random velocity fluctuations are observed. The velocity fluctuation grows downstream and triggers the transition to turbulence., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA0064575017, レポート番号: JAXA-SP-09-014}, publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)}, title = {境界層外部に導入した局所撹乱が遷移に及ぼす影響}, volume = {JAXA-SP-09-014}, year = {2010} }