Effect of Local Periodic Disturbance on Mixing Layer at Exit of Two-Dimensional Jet
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- ICHIMIYA Masashi
- The Univ. of Tokushima, Institute of Technology and Science
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- KATO Toshihiro
- 中国電力(株)
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- MORIMOTO Tsutomu
- 徳島大学大学院ソシオテクノサイエンス研究部
Bibliographic Information
- Other Title
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- 2次元噴流出口混合層に及ぼす局所周期撹乱の効果
Abstract
The laminar-turbulent transition of a mixing layer induced by oscillating flat plates at an exit of a two-dimensional nozzle was experimentally investigated. The mixing layer was formed between the jet which issued 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 variation of the fluctuating velocity and fluctuating energy production and convection rates, which contribute to the velocity, were examined. The streamwise variation in the streamwise component did not correspond to that of the normal component.
Journal
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- TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B
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TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 77 (775), 424-436, 2011
The Japan Society of Mechanical Engineers
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Keywords
Details 詳細情報について
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- CRID
- 1390282681238279680
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- NII Article ID
- 130000873956
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- ISSN
- 18848346
- 03875016
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- Text Lang
- ja
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed