Home – Home – Jornals – Thermophysics and Aeromechanics 2002 number 1

To study flow characteristics before and behind the obstacle, an attachment region position of a separated flow and flow structures near an underlying surface, a shear subsonic turbulent flow around two-dimensional obstacles of a square cross section was experimentally investigated. The aspect ratio of the obstacle height to the turbulent boundary layer thickness in a mounted point of the model h/  was varied from 3.2 up to 0.2. It is shown that at a larger part along a wingspan (transverse coordinate) the upper obstacle surface flow has a quasi-two-dimensional character, excluding the regions bearing against side ends. At the same time a flow structure near the underlying surface is three-dimensional practically in all cases. For certain, attachment of the shear layer separated from the obstacle has an unstable character. It was set a dependence of the attached region position of the separated flow on the obstacle immersion level in the turbulent boundary layer. The influence of a slip angle on a separated flow transformation and on a width of the quasi-two-dimensional flow region is shown.