Department of Aerospace Engineering, Tokyo Metropolitan University
Department of Aerospace Engineering, Tokyo Metropolitan University
Department of Aerospace Engineering, Tokyo Metropolitan University
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
Japan Aerospace Exploration Agency (JAXA)
出版者
宇宙航空研究開発機構
出版者（英）
Japan Aerospace Exploration Agency (JAXA)
雑誌名
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）
雑誌名(英)
JAXA Special Publication: Proceedings of the 41st and 42nd JAXA Workshops on Investigation and Control of Boundar-Layer Transition
巻
JAXA-SP-08-006
発行年
2009-02-27
会議概要（会議名, 開催地, 会期, 主催者等）
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）
抄録（英）
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.
軸対称物体後流の不安定モードに関する実験的研究
64237015.pdf
(795.12KB)
