An Experimental Study on Boundary Layer

An Experimental Investigation of the Compressible Turbulent Boundary Layer

The compressible turbulent boundary layer on a flat plate with air injection has been investigated experimentally. Boundary-layer developments were measured at Mach numbers of 2-5 and 3"5 for the case of zero injection and each of three different injection rates, with and without heat transfer. The free stream Reynolds numbers were 5 x 10 7 per meter for a Mach number of 2.5 and 4.7 x 10 7 per ...

Experimental Study of Resonant Interactions of Instability Waves in an Airfoil Boundary Layer

The present paper is devoted to the detailed experimental study of weakly nonlinear resonant interactions of Tollmien-Schlichting waves in a specially designed 2D non self-similar boundary layer on an airfoil. The influence of the fundamental frequency on the efficiency of the tuned subharmonic resonance is investigated as well as the influence of frequency and spanwise wavenumber detunings. Th...

On the Arctic Boundary Layer On the Arctic Boundary Layer

The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. The reason is that here the absolute temperature increases in the lowest kilometer, making the boundary layer semi-permane...

An Experimental Investigation on the Characteristics of Turbulent Boundary Layer Flows Over a Dimpled Surface

An experimental investigation was conducted to quantify the characteristics of the turbulent boundary layer flows over a dimpled surface in comparison to those over a conventional flat plate. In addition to measuring surface pressure distributions to determine the friction factors of the test plates and to map the surface pressure inside the dimple cavity, a high-resolution digital particle ima...

An Experimental Investigation of the Boundary Layer on a Porous Circular Cylinder