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Other TitleAbout support-interference-free aerodynamic force acting on a sphere with boundary layer trip around its critical Reynolds number
Author(jpn)澤田 秀夫; 須田 信一
Author(eng)Sawada, Hideo; Suda, Shinichi
Author Affiliation(jpn)宇宙航空研究開発機構 総合技術研究本部; 宇宙航空研究開発機構 総合技術研究本部
Author Affiliation(eng)Japan Aerospace Exploration Agency Institute of Aerospace Technology; Japan Aerospace Exploration Agency Institute of Aerospace Technology
Issue Date2008-02-29
PublisherJapan Aerospace Exploration Agency (JAXA)
Publication title第39回流体力学講演会/航空宇宙数値シミュレーション技術シンポジウム2007論文集
Proceedings of 39th Fluid Dynamics Conference/Aerospace Numerical Simulation Symposium 2007
Start page28
End page32
Publication date2008-02-29
AbstractThrough advanced detail simulation tests, adjusting model mass and control factors made successful measurement of aerodynamic force on a sphere at Reynolds numbers around critical one at the JAXA 60 cm magnetic suspension and balance system. The obtained averaged aerodynamic force for 8 seconds shows that the minimum drag coefficient after the critical Reynolds number reaches 0.062 and that any hysteresis phenomenon on drag coefficient with respect to Reynolds number was not observed around the critical one. Through the obtained fluctuations of aerodynamic force, the shrunk force fluctuating around the sphere axis parallel to main flow and some force swirling the sphere about the axis for a short time were observed at Reynolds numbers larger than the critical one. And some oscillating force on a plane including the axis was observed in the test of a sphere with double tapes for boundary layer trip in large Reynolds number region around the critical one.
DescriptionJAXA Special Publication
Keywordsboundary layer transition; sphere; blunt body; aerodynamic force; magnetic suspension; critical Reynolds number; wind tunnel model; wind tunnel test; computational fluid dynamics; 境界層遷移; 球; 鈍頭体; 流体力; 磁気浮上; 臨界レイノルズ数; 風洞模型; 風洞試験; 計算流体力学
Document TypeConference Paper
JAXA Category特別資料
Report NoJAXA-SP-07-016

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