The nature of the secondary instability in transition of 3-D boundary layers

Material type: 文書・図像類

Author: White, Edward B.ほか

Publisher: 航空宇宙技術研究所

Publication date: 2000-12

Material Format: Digital

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Note (General)：: 航空宇宙技術研究所 27-29 Sept.2000 東京日本National Aerospace Laboratory 27-29 Sept.2000 Tokyo Japan後退翼上で直交流支配遷移をする時の直交流不安定性の強非線形性問題を検討した。定在波支配直交流境界層の崩壊領域に関するデータを...

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Material Type: 文書・図像類
Title: The nature of the secondary instability in transition of 3-D boundary layers
Author/Editor: White, Edward B.
Saric, William S.
Author Heading: White, Edward B.
Saric, William S.
Publication, Distribution, etc.: 航空宇宙技術研究所
Publication Date: 2000-12
Publication Date (W3CDTF): 2000-12
Alternative Title: 3次元境界層遷移時の2次不安定性の性質
Periodical title: 航空宇宙技術研究所特別資料 = Special Publication of National Aerospace Laboratory
No. or year of volume/issue: 48T
Volume: 48T
Pages: 31-32
ISSN (Periodical Title): ISSN : 0289-260X
Text Language Code: eng
Subject Heading: 3次元境界層
2次不安定性
後退翼
直交流不安定性
非線形流れ挙動
乱流
平均流等高線
スパン方向変曲点
流れ方向速度勾配
崩壊パターン
境界層遷移
three dimensional boundary layer
secondary instability
swept wing
crossflow instability
nonlinear flow behavior
turbulent flow
mean flow contour
spanwise inflection point
streamwise velocity gradient
breakdown pattern
boundary layer transition
Target Audience: 一般
Note (General): 航空宇宙技術研究所 27-29 Sept.2000 東京日本
National Aerospace Laboratory 27-29 Sept.2000 Tokyo Japan
後退翼上で直交流支配遷移をする時の直交流不安定性の強非線形性問題を検討した。定在波支配直交流境界層の崩壊領域に関するデータを準備するため、境界層構造が結果的に乱流に変わる2次不安定性過程を検討した。45度後退翼の境界層内の平均および変動速度成分をアリゾナ州立大学の非定常風洞を使って測定した。モデルは自然層流設計とした。崩壊直前の代表的平均流等高線を計測した。高周波2次不安定性変動は、通常はスパン方向変曲点が支配的2次不安定性モードを支持することを明らかにした。2次不安定性は崩壊直前に急速に拡大し、崩壊の位置は最大2次不安定性活動度の位置に関係する。2次不安定性データは既報研究報告に記載の計算結果と定性的によく一致することを示した。
The problem of strongly non-linear nature of the crossflow instability at the crossflow-dominated transition on a swept wing was investigated. The secondary instability process, by which the boundary layer structure result to turbulent flow, was investigated in order to provide data on the breakdown region of a stationary-wave-dominated crossflow boundary layer. The mean and fluctuating velocity components in the boundary layer of a 45 deg swept wing were measured in the Arizona State University (ASU) unsteady wing tunnel. The model is a natural laminar flow design. A typical mean flow contour just prior to breakdown was measured. High frequency secondary instability fluctuation revealed that it is usually the spanwise inflection point that supports the dominant secondary instability mode. The secondary instability grows very rapidly just prior to breakdown, and the location of breakdown can be correlated to the location of maximum secondary instability activity. The secondary instability data show good qualitative agreement with the results of computations published in the previous report.
資料番号: AA0028637013
レポート番号: NAL SP-48T
Access Restrictions: 限定公開
Periodical Title (NCID): AN10097345
https://ci.nii.ac.jp/ncid/AN10097345
Data Provider (Database): 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）
https://irdb.nii.ac.jp
Original Data Provider (Database): 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