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Analysis and control of boundary layer transition on a NACA 0008 wing profile
KTH, School of Engineering Sciences (SCI), Mechanics.
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The main aim of this thesis was to understand the mechanism behind the classical transition scenario inside the boundary layer over an airfoil and eventually attempting to control this transition utilizing passive devices for transition delay. The initial objective of analyzing the transition phenomenon based on TS wave disturbance growth was conducted at 90 Hz using LDV and CTA measurement techniques at two different angles of attack. This was combined with the studies performed on two other frequencies of 100 and 110 Hz, in order to witness its impact on the neutral stability curve behavior. The challenges faced in the next phase of the thesis while trying to control the transition location, was to understand and encompass the effect of adverse pressure gradient before setting up the passive control devices, which in this case was miniature vortex generators. Consequently, several attempts were made to optimize the parameters of the miniature vortex generators depending upon the streak strength and stability. Finally, for 90 Hz a configuration of miniature vortex generators have been found to successfully stabilize the TS wave disturbances below a certain forcing amplitude, which also led to transition delay.

Place, publisher, year, edition, pages
2018. , p. 50
Series
TRITA-SCI-GRU ; 2018:421
Keywords [en]
boundary layer stability, laminar - turbulent transition, laminar flow control, Tollmien-Schlichting waves, streaky boundary layers, miniature vortex generators, Falkner-Skan boundary layer.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-239931OAI: oai:DiVA.org:kth-239931DiVA, id: diva2:1268646
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Examiners
Available from: 2018-12-06 Created: 2018-12-06 Last updated: 2018-12-06Bibliographically approved

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CiteExportLink to record
Permanent link

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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf