Spanwise boundary layer modulations using finite discrete suction for transition delay
(English)Manuscript (preprint) (Other academic)
Discrete suction is deployed in a flat plate boundary layer to create spanwise mean velocity gradients with the goal of delaying the onset of laminar-to-turbulent transition. It is shown that finite boundary layer suction through a set of holes in a spanwise-oriented array in the flat plate is successful in setting up steady and robust streamwise streaks in the boundary layer. Today, this type of three-dimensional boundary layer is known to attenuate the growth of Tollmien--Schlichting (TS) waves and delay the transition to turbulence. The control technique is also tested successfully for natural transition where a broad frequency band of TS~waves are naturally induced in the boundary layer.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-181895OAI: oai:DiVA.org:kth-181895DiVA: diva2:901348
FunderEU, European Research Council
QS 20162016-02-072016-02-072016-02-08Bibliographically approved