フルテキストURL Experim_Fluid_57_166.pdf
著者 Kouchi, Toshinori| Yamaguchi, Shingo| Koike, Shunske| Nakajima, Tsutomu| Sato, Mamoru| Kanda, Hiroshi| Yanase, Shinichiro|
抄録 We visualized the shock buffets on a two-dimensional transonic airfoil with and without vortex generators (VGs) by using a fast-framing focusing schlieren imaging. The focusing schlieren visualization showed that the flow three-dimensionality around the airfoil became remarkable with installing the VGs. This implies that narrow depth of focus of imaging systems was a key to accurately capture the characteristics of the shock oscillation due to the buffet for the cases with VGs. The time-resolved imaging also revealed that non-periodic components were included in the shock oscillation due to the buffet for the cases with VGs. This prevented Fourier analysis from being applied. We used wavelet analysis to extract the characteristic of the shock oscillation for the cases with VGs. The wavelet spectrograms revealed that the low-frequency oscillation having the buffet frequency was still included intermittently in the shock oscillation even when VG controlled the buffet. The rate of appearing the low-frequency oscillation increased with increasing both the interval between VGs and the angle of attack.
キーワード Shock Wave Wavelet Analysis Shock Motion Shock Oscillation Source Grid
備考 This is an Accepted Manuscript of an article published by Springer
発行日 2016-10-14
出版物タイトル Experiments in Fluids
57巻
11号
出版者 Springer
開始ページ 166
ISSN 0723-4864
NCID AA10447762
資料タイプ 学術雑誌論文
言語 English
OAI-PMH Set 岡山大学
論文のバージョン author
DOI 10.1007/s00348-016-2261-2
Web of Sience KeyUT 000388613000003
関連URL isVersionOf https://doi.org/10.1007/s00348-016-2261-2