周期的変動を受ける剥離流れの位相平均解析
| Autor: | Yamagishi, Masaki, Togano, Tomoko, Tashiro, Shinichi |
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| Jazyk: | japonština |
| Rok vydání: | 2002 |
| Předmět: |
flat plate
平板 位相ジッタリング wavelet analysis 周波数変調 せん断層 separated flow hot-wire flowmeter boundary layer periodic velocity fluctuation 境界層 位相平均解析 ウエーブレット解析 速度分布 velocity distribution research and development Physics::Fluid Dynamics 剥離流 frequency modulation 周期的速度変動 shear layer phase averaging analysis 熱線流速計 phase jittering 研究開発 |
| Zdroj: | 航空宇宙技術研究所特別資料: 境界層遷移の解明と制御研究会講演論文集 第29回・第30回 = Special Publication of National Aerospace Laboratory: Proceedings of the 29th and 30th NAL Workshops on Investigation and Control of Boundary-Layer Transition. 56:3-6 |
| ISSN: | 1347-457X |
| Popis: | When the periodic velocity fluctuation is introduced in a mean flow, the separation flow changes in various manners. The change, in particular, the motion of the separation shear layer, appears in the frequency of the fluctuation. In order to see clearly the principal motion of the velocity field, phase averaging was conducted to the velocity signals. In this study, wavelet analysis is applied to obtain the dominant frequency and phase. The contours of the phase averaging velocity could be presented and discussed in this study. The shapes of contour varied dynamically at each phase and show the periodic motion of the shear layer. The separation shear layer flutters with the velocity fluctuation in the mean flow. By the suitable frequency, the separation region disappears in the most of phases due to the depressed shear layer near the wall. 資料番号: AA0045947002 レポート番号: NAL SP-56 |
| Databáze: | OpenAIRE |
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