@inproceedings{oai:jaxa.repo.nii.ac.jp:00036746,
 author = {森, 友紀 and 福島, 千晴 and 永田, 拓 and Mori, Tomonori and Fukushima, Chiharu and Nagata, Hiroshi},
 book = {航空宇宙技術研究所特別資料, Special Publication of National Aerospace Laboratory},
 month = {Sep},
 note = {航空宇宙技術研究所 Sep. 1994 (15th). Mar. 1995 (16th) 東京 日本, National Aerospace Laboratory Sep. 1994 (15th). Mar. 1995 (16th) Tokyo Japan, 水素気泡法による渦構造の理解への定量的情報を与える技法を提案した。この技法を用いて、円柱の後流近傍の渦領域での速度のみでなく、速度勾配テンソルも得た。この技法に基づいて得た値より、滞留点を通過する断面流線のパターンや、それの渦の中心近傍領域への拡大や渦度の等高線などによって、渦の全体構造を示した。それにより、剪断応力の局所値や渦領域での発散、さらには、全般的な渦の特性値、例えば循環、エンストロフィー、運動量、角運動量など、を決定した。それらの結果は、柱体の背後で形成される渦が、柱体の後流近くの下流で対流を起す時、シート状の渦から棒状の渦への渦構造の変化が起こることを示唆した。, A technique for quantitative information was proposed to understand the vortex structure by means of hydrogen bubble techniques. Using the technique, not only the velocity but the velocity gradient tensor was obtained in the vortex region in the near wake of a circular cylinder. Based on the values obtained in this technique, the patterns of sectional streamlines passing through stagnation points and extending to the region near the center of vortices and the contour of vorticity were illustrated to see the overall structure of the vortices. Thus, the local values of shear stress and divergence were determined in the vortex region as well as the global characteristic values of vortices, e. g. circulation, enstrophy, momentum, angular momentum, etc. These results suggest that the vortices change in structure from sheet-like vortices to rod-like vortices when the vortices formed behind the cylinder were convected downstream in the near wake of the cylinder., 資料番号: AA0000109017, レポート番号: NAL SP-28},
 pages = {67--72},
 publisher = {航空宇宙技術研究所, National Aerospace Laboratory (NAL)},
 title = {可視化実験による渦構造の定量的解明:速度こう配テンソルの測定},
 volume = {28},
 year = {1995}
}