並列タイトル等Three-Dimensional Boundary-Layer Transition on a Swept Wing
タイトル（掲載誌）航空宇宙技術研究所特別資料 = Special Publication of National Aerospace Laboratory SP-15
一般注記Stability and transition experiments are conducted on a 45 degrees swept airfoil in the ASU Unsteady Wind Tunnel. The pressure gradient is designed to obtain pure crossflow-dominated transition where the instability occurs through crossflow vortices that are generic to three-dimensional boundary layers. Flow-visualization and hot-wires are used to show that transition to turbulence occurs through a high-frequency, secondary instability that appears when the streamwise velocity profile is distorted by the stationary crossflow vortex. Multiple inflection points occur in the velocity profiles in very localized regions. These regions, characterized by spanwise velocity gradients that are the same magnitude as the normal-to-the-wall gradients, are the source of the sawtooth transition patterns. The travelling crossflow waves, although strongly amplified, appear to play only a passive role in the transition process. Detailed roughness measurements near the attachment line account for the strongly three-dimensional transition patterns that have been observed.
資料番号: NALSP0015009
レポート番号: NAL SP-15
一次資料へのリンクURLhttps://jaxa.repo.nii.ac.jp/?action=repository_action_common_download&item_id=43483&item_no=1&attribute_id=31&file_no=1
連携機関・データベース国立情報学研究所 : 学術機関リポジトリデータベース（IRDB）（機関リポジトリ）
提供元機関・データベース宇宙航空研究開発機構 : 宇宙航空研究開発機構リポジトリ