Mastering non-linear flow dynamics for laminar flow control
(English)Manuscript (preprint) (Other academic)
A laminar flow control technique based on spanwise mean velocity gradients (SVG) has recently proven successful in delaying transition in boundary layers. Here we take advantage of a well-known non-linear effect, namely the interaction of two oblique waves at high amplitude, to produce spanwise mean velocity variations. Against common belief we are able to fully master the first stage of this non-linear interaction to generate steady and stable streamwise streaks, that in turn trigger the SVG method. Our experimental results show that the region of laminar flow can be extended with up to 230\%.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-181896OAI: oai:DiVA.org:kth-181896DiVA: diva2:901349
FunderEU, European Research Council
QS 20162016-02-072016-02-072016-02-08Bibliographically approved