Velocity profile measurement of supersonic boundary layer over a flat plate using the PIV technique

Title & Authors
Velocity profile measurement of supersonic boundary layer over a flat plate using the PIV technique
Lee, Hyuk; Kim, Young Ju; Byun, Yung Hwan; Park, Soo Hyung;

Abstract
Velocity profiles of laminar, transition and turbulent boundary layers were investigated by using Particle Image Velocimetry(PIV) measurements on the flat plate at Mach 2.96. The Schlieren visualization and PIV measurements are also used to confirm whether the oblique shock wave generated from the leading edge affects the flow field over the flat plate. The laminar velocity profile measured from the experiment was well matched with the compressible Blasius solution. The velocity profile of the transition boundary layer was well correlated with the theoretical turbulent velocity profile from near the wall and the transition began from Re = $\small{1.41{\times}106}$. For the turbulent boundary layer, considering compressibility effects, the Van Driest-transformed velocity satisfies the incompressible log-law. It is found that the log region is extended farther in the wall-normal direction compared to the log region in incompressible boundary layer.
Keywords
Particle Image Velocimetry;Supersonic Boundary Layer;Blasius Solution;Transition Reynolds Number;Log Law;Flat Plate;
Language
Korean
Cited by
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