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ID 119365
著者
Kato, Toshihiro The Chugoku Electric Power
森本, 努 The University of Tokushima
キーワード
Mixing Layer
Transition
Turbulence
Jet
Oscillating Plate
Periodic Disturbance
Absolute/Convective Instability
Velocity Distribution
資料タイプ
学術雑誌論文
抄録
The laminar-turbulent transition of a mixing layer induced by oscillating flat plates at an exit of a two-dimensional nozzle was experimentally investigated. A mixing layer was formed between the jet from the nozzle and the surrounding quiescent fluid. The plates oscillated vertically in relation to the mean flow. The oscillation frequency was two orders of magnitude smaller than the fundamental frequency of the velocity fluctuation. Mean and fluctuating velocity components in the streamwise and normal directions were measured by hot-wire anemometers. The oscillation was found to be effective in enhancing the mixing, though the amplitude was the same order as the momentum thickness of the boundary layer at the nozzle exit. The disturbance traveled downstream as the convective instability, though it was damped only far downstream. The downstream development rate of fluctuating velocity in the normal component was larger than that in the streamwise one. Thus, the need for linear instability analysis of non-parallel flow was suggested. Streamwise variations were examined in the fluctuating velocity and perturbation energy production and convection rates, which contribute to the velocity. The streamwise variation in the streamwise component did not correspond to that of the normal component.
掲載誌名
Journal of Fluid Science and Technology
ISSN
18805558
出版者
日本機械学会
6
6
開始ページ
887
終了ページ
901
発行日
2011
EDB ID
出版社版DOI
出版社版URL
フルテキストファイル
言語
eng
著者版フラグ
著者版
部局
理工学系