Change search
ReferencesLink to record
Permanent link

Direct link
Comparison between dierent passive vortex generators and their stabilizing effect on Tollmien-Schlichting waves
KTH, School of Engineering Sciences (SCI), Mechanics, Stability, Transition and Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0003-3310-0633
(English)Manuscript (preprint) (Other academic)
Abstract [en]

An experimental investigation is performed on the streaky boundary layers generated by three types of vortex generators; namely cylindrical roughness elements, and miniature vortex generators (MVG) with triangular and rectangular blades. The stability of the generated streaks and the amplitude of the spanwise modulations are compared together with their efficiency to stabilize Tollmien--Schlichting (TS) waves, where the TS waves are generated upstream of the vortex generators. It is shown that for constant geometrical and boundary layer parameters the amplitude of the streaks generated by rectangular MVGs is considerably higher compared to triangular MVGs and roughness elements, even though a higher critical roughness-height Reynolds numbers is obtained for MVGs with triangular blades. In the investigated streaky boundary layers similar TS wave amplitude attenuation rates are obtained for rectangular and triangular MVGs at branch~II of the neutral stability curve whereas a higher TS wave amplitude is obtained for roughness elements compared to the two-dimensional reference boundary layer.

National Category
Fluid Mechanics and Acoustics
Identifiers
URN: urn:nbn:se:kth:diva-181894OAI: oai:DiVA.org:kth-181894DiVA: diva2:901347
Funder
EU, European Research Council
Note

QS 2016

Available from: 2016-02-07 Created: 2016-02-07 Last updated: 2016-02-08Bibliographically approved

Open Access in DiVA

No full text

Search in DiVA

By author/editor
Sattarzadeh Shirvan, Sohrab
By organisation
Stability, Transition and ControlACCESS Linnaeus Centre
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Total: 5 hits
ReferencesLink to record
Permanent link

Direct link