10.13009/EUCASS2017-210
PAVLENKO, Alexandr
Alexandr
PAVLENKO
KOZLOV, Victor
Victor
KOZLOV
KATASONOV, Mikhail
Mikhail
KATASONOV
DOVGAL, Alexander
Alexander
DOVGAL
Evolution of perturbations of laminar flow behind the ledge of the surface generated by its localized vibration
Proceedings of the 7th European Conference for Aeronautics and Space Sciences. Milano, Italy, 3-6 july 2017
2017
Article
FLUID MECHANICS
AERODYNAMICS
FLOW FIELD VISUALIZATION
LAMINARITY
TURBULENCE
2017
8 pages
PDF
The origin and evolution of perturbations generated by low frequency localized local vibrations of the wall at flow separation behind a backward-facing step on a flat plate is investigated in a subsonic wind tunnel. The results are obtained using the hot-wire anemometry technique. It is found, that the wall vibrations produce disturbances of the separation region named streaky structures accompanied by wave packets of oscillations. Laminar boundary layer separation induces the growth of wave packet followed by near-wall flow turbulization.