Experimental study on artificial environment to promote onset of turbulence
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- YANAGISAWA Yukizumi
- Department of Mechanical Systems Engineering, Tohoku University
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- NISHIO Yu
- Department of Systems Design Engineering, Seikei University
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- IZAWA Seiichiro
- Institute of Fluid Science, Tohoku University
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- FUKUNISHI Yu
- Institute of Computational Fluid Dynamics
Abstract
<p>A wind tunnel experiment was performed to investigate the requirements for providing a suitable environment for easily creating a localized turbulent region in a laminar boundary layer. A combination of a short-duration jet and suctions was used to prepare a potentially unstable region upstream, and another jet was ejected downstream against the region at various timings and different relative spanwise locations. Based on the results, the combination of the potentially unstable region and the short-duration jet promoted the transition to turbulence only under limited conditions, whereas in most cases, it worked negatively. However, the turbulent spot generation was enhanced when the downstream jet was used at the timing and location that enlarged the low-velocity area created upstream. Moreover, the locally disturbed region generated by the combination of the potentially unstable region and the short-duration jet did not directly grow into a turbulent spot; rather, the turbulent spot grew in the region following the disturbed region.</p>
Journal
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- Journal of Fluid Science and Technology
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Journal of Fluid Science and Technology 15 (3), JFST0017-JFST0017, 2020
The Japan Society of Mechanical Engineers
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Details 詳細情報について
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- CRID
- 1390566775160137344
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- NII Article ID
- 130007889174
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- ISSN
- 18805558
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- Text Lang
- en
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- Data Source
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- JaLC
- Crossref
- CiNii Articles
- KAKEN
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- Abstract License Flag
- Disallowed