Boundary layer receptivity to free-stream turbulence and surface roughness over a swept flat plate
2011 (English)In: Physics of fluids, ISSN 1070-6631, E-ISSN 1089-7666, Vol. 23, no 3, 034107- p.Article in journal (Refereed) Published
An experimental study of the receptivity of disturbances and their subsequent development into a three-dimensional boundary layer has been carried out. The three-dimensional boundary layer was set up using a flat plate with a swept leading edge and a pressure gradient using a displacement body at the ceiling of the test section. Low level free-stream turbulence was generated with five different screens and was shown to generate traveling crossflow modes for all but the lowest turbulence level, i.e., for Tu > 0.2%, where instead a stationary crossflow disturbance dominated. Stationary crossflow disturbances were triggered by small cylindrical roughness elements arranged in an array. For high enough roughness Reynolds number (Re-k) stationary disturbances growing exponentially were seen and their amplitude seems to scale with Re-k(2.3).
Place, publisher, year, edition, pages
2011. Vol. 23, no 3, 034107- p.
DISTURBANCE GROWTH, BYPASS TRANSITION, STABILITY, FLOW, INSTABILITY
IdentifiersURN: urn:nbn:se:kth:diva-32600DOI: 10.1063/1.3562843ISI: 000289153000025ScopusID: 2-s2.0-79953646585OAI: oai:DiVA.org:kth-32600DiVA: diva2:412055
FunderTrenOp, Transport Research Environment with Novel Perspectives
QC 201104202011-04-202011-04-182012-06-12Bibliographically approved