Dispersive evolution of a point-source disturbance in three-dimensional boundary layers subject to crossflow instability

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
3次元境界層に固有な横流れ不安定場での点状連続攪乱の形成と成長を実験的に検討した。攪乱は、小さな孔から境界層流中に連続的に空気を噴出する空気噴流柱により、人工的に起こした。熱線測定の結果、静的モードも進行モードも楔形になる。これは、進行波が分散しながら正常方向にも局部外向流の方向にも伝搬するからである。
The formation and development of a point-source disturbance in a three-dimensional boundary layer subject to crossflow instability has been investigated experimentally. The disturbance was artificially initiated by an airjet column, which was continuously issued into the boundary layer flow through a small hole. Hot-wire surveys showed that both stationary and traveling modes evolve into a wedge shape as the traveling waves dispersively propagate in both directions approximately normal to local external flow.
資料番号: AA0000109012
レポート番号: NAL SP-28