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Visualization of Mechanical Processes: An International Online Journal


ISSN Online: 2152-209X

Visualization of Mechanical Processes: An International Online Journal

DOI: 10.1615/VisMechProc.2013003838

EXPERIMENTAL STUDY OF LOCALIZED BOUNDARY LAYER DISTURBANCES AT HIGH FREE-STREAM TURBULENCE LEVEL

Victor V. Kozlov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 4/1, Novosibirsk, 630090 Novosibirsk region, Russia
Mikhail M. Katasonov
Khristianovich Institute of Theoretical and Applied Mechanics, Siberian Branch of the Russian Academy of Sciences, Institutskaya St. 4/1, Novosibirsk, 630090 Novosibirsk region, Russia
Dmitry Sergeevich Sboev
Central Aerohydrodynamic Institute (TsAGI), 1 Zhukovsky str., Zhukovsky, Moscow region, 140180 Russia

ABSTRACT

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.