An experimental investigation of the effects of spherical roughness elements on transition and boundary layer development.

Yeğen, İmdat


An experimental investigation on the boundary layer development upon a swept flat plate with a zero streamwise pressure gradient and growth of the turbulent boundary layer behind three-dimensional roughness elements.
Çarpınlıoğlu, Melda Özdinç; Göksel, Ömer T.; Department of Mechanical Engineering (1992)
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...
An Experimental study on boundary layer separation control over s809 airfoil using synthetic jet actuators
Gül, Melika; Akmandor, İbrahim Sinan; Uzol, Oğuz; Department of Aerospace Engineering (2013)
This thesis presents the results of an experimental study that investigates the effect of periodic excitation from individually controlled synthetic jet actuators on the separated shear layer and wake of a model wing that has S809 airfoil profile. The synthetic jet array consists of three individually controlled synthetic jet actuators driven by piezoelectric diaphragms located at 28% chord location near the middle of the span of the blade. In the first part of the study, hot wire and surface pressure measu...
A comparative case study on school management practices in the United States and Turkey
Silman, Fatoş; Şimşek, Hasan; Department of Educational Sciences (2005)
This study aimed to comparatively examine school management practices in the US and Turkey in light of the two distinct administrative paradigms:Anglo-Saxon and Napoleonic traditions. In this study, a comparative case study method was used. The study was conducted in a basic education school (grades 1-8) in Ankara, Turkey, and in an elementary school (K-5) in Madison, the capital city of the state of Wisconsn, US. The sample contained 13 teachers and 4 administrators in the Turkish case, and 10 teachers and...
A Comparison of surface and biological properties of chitosan/tannic acid and chitosan/poly(acrylic acid) multilayers
Saraçoğulları, Nihan; Erel Göktepe, İrem; Department of Biotechnology (2019)
Chitosan is a natural polysaccharide which finds use in various biomedical applications due to its important biological properties. Layer-by-layer (LbL) technique is a practical and economical method to functionalize surfaces using interacting polymer pairs. LbL technique can also be used to construct polymer platforms for controlled release of functional molecules from a surface. In this thesis, ultra-thin polymer coatings were prepared using Chitosan and two different weak polyacids, i.e. Tannic Acid (TA)...
Citation Formats
İ. Yeğen, “An experimental investigation of the effects of spherical roughness elements on transition and boundary layer development.,” Ph.D. - Doctoral Program, Middle East Technical University, 1982.