Back to Search
Start Over
Characteristic features of a wave packet in rotating-disk flow
- Source :
- 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. 56:93-94
- Publication Year :
- 2002
- Publisher :
- 航空宇宙技術研究所, 2002.
-
Abstract
- Characteristic features of a wave packet in a rotating-disk boundary layer were experimentally investigated. The point disturbance originating from a small hole on the disk forms an isolated wave packet which consists of two types of unstable waves. Comparison with the prediction by Itoh's linear stability theory enabled the identification of these waves; the streamline-curvature (S-C) modes with the smaller wave number in the circumferential direction and the higher frequency are observed prior to the appearance of cross-flow (C-F) modes with the larger wave number and lower frequency. The hot-wire analyses quantitatively show that such characteristic features of these modes are in good agreement with the theoretical results. Time trace of the edge of packet does not indicate the occurrence of absolute instability but shows that the wave packet convectively passes through the radius line corresponding to the critical Reynolds number for the absolute instability predicted by Lingwood.<br />資料番号: AA0045947029<br />レポート番号: NAL SP-56
Details
- Language :
- Japanese
- ISSN :
- 1347457X
- Volume :
- 56
- Database :
- OpenAIRE
- Journal :
- 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
- Accession number :
- edsair.jairo.........0ea0ac9eb5eec7e667b039a839b70251