@inproceedings{oai:jaxa.repo.nii.ac.jp:00005473, author = {星野, 真一 and 稲澤, 歩 and 浅井, 雅人 and 小西, 康郁 and 高木, 正平 and 澤田, 秀夫 and Hoshino, Shinichi and Inasawa, Ayumu and Asai, Masahito and Konishi, Yasufumi and Takagi, Shohei and Sawada, Hideo}, 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41回・第42回), JAXA Special Publication: Proceedings of the 41st and 42nd JAXA Workshops on Investigation and Control of Boundar-Layer Transition}, month = {Feb}, note = {第42回「境界層遷移の解明と制御」研究会(2008年3月31日-4月1日), The instability of axisymmetric laminar wake behind a body of revolution whose cross section is a NACA0018 airfoil is studied experimentally under a natural disturbance condition. Magnetic Suspension and Balance Systems (MSBS) are used to support the axisymmetric body in order to avoid undesirable influences of mechanical supports on the disturbance development. A multi-hotwire-sensor probe is used to identify helical instability modes. The experiment is conducted mainly at a Reynolds number based on the maximum diameter Re = 1.9 × 10(exp 4). It is found that the wake is convectively unstable despite that the flow is slightly reversed near the trailing edge. Spatially-growing instability waves are found to be helical modes with azimuthal wavenumber of 1 as predicted by the linear stability theory for the axisymmetric wake. The spatial growth rate and amplitude distribution obtained experimentally agree well with those calculated from the linear stability theory., 形態: カラー図版あり, 資料番号: AA0064237015, レポート番号: JAXA-SP-08-006}, publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)}, title = {軸対称物体後流の不安定モードに関する実験的研究}, volume = {JAXA-SP-08-006}, year = {2009} }