Visualization of Mechanical Processes: An International Online Journal
Erscheint 4 Ausgaben pro Jahr
ISSN Online: 2152-209X
EXPERIMENTAL STUDY OF LOCALIZED BOUNDARY LAYER DISTURBANCES AT HIGH FREE-STREAM TURBULENCE LEVEL
Volumen 2,
Ausgabe 4, 2012,
DOI: 10.1615/VisMechProc.2013003838
ABSTRAKT
Turbulence production processes in boundary layer at enhanced and high level of free-stream turbulence have been studied. The longitudinal localized disturbances developing in the boundary layer under the action of free-stream turbulence were artificially modeled using a blowing-suction technique. Wave packets, or forerunners, produced in the boundary layer, in the region preceding the abrupt local change of flow velocity near the localized-disturbance fronts, were examined. The enhanced and high level of free-stream turbulence was found to accelerate the downstream evolution of the wave packets and their transformation into turbulent spots.
SCHLÜSSELWÖRTER: laminar-turbulent transition, high free-stream turbulence, forerunners, longitudinal structures
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