Investigation of the boundary layer transition, the turbulent boundary layer development and the recovery length of the turbulent boundary layer behind three dimensional roughness elements.

Albayrak, Kahraman


An experimental investigation of the effects of spherical roughness elements on transition and boundary layer development.
Yeğen, İmdat; Göksel, Ömer T.; Department of Mechanical Engineering (1982)
Investigation of wind effects on tall buildings through wind tunnel testing
Kayışoğlu, Bengi; Kurç, Özgür; Department of Civil Engineering (2011)
In recent years, especially in the crowded city-centers where land prizes have become extremely high, tall buildings with more than 30 floors have started to be designed and constructed in Turkey. On the other hand, the technical improvements have provided the opportunity of design and construction of more slender structures which are influenced by the wind actions more. If the building is flexible, wind can interact with it so the wind induced oscillations can be significantly magnified. In order to analyz...
Investigation of inertial support limits in wind turbines and the effects on the power system stability
Duymaz, Erencan; Keysan, Ozan; Department of Electrical and Electronics Engineering (2019)
In this study, the inertial support implementation is studied for variable speed wind turbines with a full-scale power electronics. To increase the active power as desired, Machine Side Converter is modified with an additional control loop. In the first part of the thesis, active power of the wind turbine is increased to the limits and the maximum achievable active power is found out to be restricted by the wind speed. It is found that the wind turbine can increase its output power by 40% of rated power in ...
Investigation of the relationship between aerosol and rainwater composition
Türküm, Ahmet; Tuncel, Süleyman Gürdal; Department of Environmental Engineering (2004)
Chemical composition of particles and rain water at three sites in Turkey were extensively compared to determine if there is a relationship between aerosol and rain composition. If such relationship exists, it can allow one to construct rain water composition using aerosol data. This is important because, rain composition data is scarce as sampling and analysis of very low concentrations of elements and ions in rain water is more difficult compared to sampling and analysis of atmospheric aerosol. Results sh...
Development and evaluation of new bleed boundary condition models for supersonic inlet boundary layer bleed flow
Akar, Gökhan; Eyi, Sinan; Department of Aerospace Engineering (2019)
Shock wave/boundary layer interaction is an important issue that should be considered when studying supersonic inlet design for air vehicles. Porous bleed systems have traditionally been used for increase stability and efficiency of the supersonic inlets by means of removing the lower momentum part of the boundary layer to prevent flow separation caused by adverse pressure gradient. However, evaluating and determining the effect of the boundary layer bleed system on the performance of the supersonic inlet i...
Citation Formats
K. Albayrak, “Investigation of the boundary layer transition, the turbulent boundary layer development and the recovery length of the turbulent boundary layer behind three dimensional roughness elements.,” Ph.D. - Doctoral Program, Middle East Technical University, 1984.