8th European Postgraduate Fluid Dynamics Conference

6th – 9th July 2016
Warsaw, Poland

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Impact of strong pressure gradient on mean flow properties of turbulent boundary layer

MSc. Mathias Romanczyk1, Prof. Witold Elsner1, PhD Artur Dróżdż1
1Czestochowa University of Technology, Faculty of Mechanical Engineering and Computer Science, Institute of Thermal Machinery
The research is devoted to experimental analysis of turbulent boundary layer developed under the influence of strong adverse pressure gradient at the flat plate. The main part of this work concerns the analysis of the streamwise fluctuating velocity and mean velocity profiles as well as boundary layer global parameters. The particular goal of the study was to identify the Transitory Detachment (ITD) point, where the reverse flow occurs about 20 of the total time. For the purposes various separation criteria were discussed.
The experiment was carried out in low speed wind tunnel for three different adverse pressure gradients. The adverse pressure gradient is controlled by curvature of the upper wall and by flow suction at the same location. In the experiment hotwire anemometry technique was
Keywords: Turbulence, Wall-bounded flows
Figure 1: Distribiution of fluctuation velocity. The outer peak overcomes the inner one. It can be concluded also that the inner peak is no longer present for the strong Adverse Pressure Gradient