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Experimental study on onset turbulence in a flat-plate boundary layer

Authors :
Kensuke OKADA
Masato HIROTA
Seiichiro IZAWA
Yu FUKUNISHI
Source :
Journal of Fluid Science and Technology, Vol 14, Iss 2, Pp JFST0008-JFST0008 (2019)
Publication Year :
2019
Publisher :
The Japan Society of Mechanical Engineers, 2019.

Abstract

A wind tunnel experiment was performed to investigate the suitable conditions in which a localized turbulent region can easily be generated in a flat-plate boundary layer. An artificial disturbance of zero-mass flux was introduced upstream using a combination of a short-duration jet and suctions to prepare a potentially unstable environment. The disturbed region by itself decayed downstream. Another jet was then ejected downstream at several different timings and two different spanwise locations relative to the passage of the locally disturbed region to promote transition to turbulence. Although the jet was too weak to trigger the turbulence transition by itself, an isolated turbulent region, the so-called turbulent spot, was generated when ejected against the disturbed region. The optimum conditions were found when the jet was ejected between the high- and low-speed areas of the convecting unstable region.

Details

Language :
English
ISSN :
18805558
Volume :
14
Issue :
2
Database :
Directory of Open Access Journals
Journal :
Journal of Fluid Science and Technology
Publication Type :
Academic Journal
Accession number :
edsdoj.5dcf35852ff149d382a9760d24911ac1
Document Type :
article
Full Text :
https://doi.org/10.1299/jfst.2019jfst0008