Title :
Optical skin friction measurements in the short-duration Ludwieg tube facility
Author_Institution :
Inst. of Aerodynamics & Flow Technol., German Aerosp. Center, Gottingen, Germany
Abstract :
The utilization of image acquisition, image processing and skin friction computations has been developed to support skin friction measurements at the Ludwieg-tube facility at DLR. Verification of the oil-film-interferometry technique with analytical tests at different flows with given shear stress distributions showed its advantages and handicaps for skin friction measurements in 3D gradient flows. The abilities of the thin oil film technique with its application in a short duration wind tunnel are demonstrated on some 2D and 3D shock wave / turbulent boundary layer interaction flows.
Keywords :
boundary layer turbulence; computational fluid dynamics; flow simulation; friction; light interferometry; liquid films; pipe flow; shock waves; wind tunnels; 2D shock wave / turbulent boundary layer interaction flows; 3D gradient flows; 3D shock wave / turbulent boundary layer interaction flows; Ludwieg tube facility; image acquisition; image processing; oil film interferometry technique; optical skin friction measurements; shear stress distributions; short duration wind tunnel; skin friction computations; three dimensional gradient flows; two dimensional shock waves; Equations; Fluid flow measurement; Friction; Interference; Optical films; Optical interferometry; Optical surface waves; Petroleum; Skin; Stress measurement;
Conference_Titel :
Instrumentation in Aerospace Simulation Facilities, 2003. ICIASF '03. 20th International Congress on
Print_ISBN :
0-7803-8149-1
DOI :
10.1109/ICIASF.2003.1274865
