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Base flow modulations for skin-friction drag reduction
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. (SGCE)ORCID iD: 0000-0002-3251-8328
KTH, School of Engineering Sciences (SCI), Mechanics. KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW.
2011 (English)In: Journal of Physics: Conference Series, 2011Conference paper, Published paper (Refereed)
Abstract [en]

Recent experimental investigations have shown that spanwise modulations of thebase flow may delay transition to turbulence. In this paper we explore the possibility togenerate streaks of much larger amplitude than previously reported by using a row of miniaturevortex generators (MVGs). Here, we present the first boundary layer experiment where streakamplitudes exceeding 30% have been produced without having any secondary instability actingon them. Furthermore, the induced drag due to the streaky base flow is quantified and it isdemonstrated that the streaks can be reinforced by placing a second array of MVGs downstreamof the first one. In this way it is possible to make the control more persistent in the downstreamdirection. We conclude that the specially designed set of MVGs, as a boundary layer modulator,is a promising candidate for successfully setting up robust and persistent streamwise streaks,which is a prerequisite for a successful flow control.

Place, publisher, year, edition, pages
2011.
Series
Journal of Physics Conference Series, ISSN 1742-6588
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-87063DOI: 10.1088/1742-6596/318/3/032008ISI: 000301336300008Scopus ID: 2-s2.0-84856360176OAI: oai:DiVA.org:kth-87063DiVA: diva2:501344
Conference
EUROMECH, 13th European Turbulence Conference, Sept. 12-15, Warsaw
Note

QC 20120411

Available from: 2012-02-14 Created: 2012-02-14 Last updated: 2012-08-30Bibliographically approved

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Fransson, Jens H. M.

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  • apa
  • harvard1
  • ieee
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  • de-DE
  • en-GB
  • en-US
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  • nn-NB
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  • Other locale
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Output format
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