Abstract
Measurement was made on the mean flowfield to investigate the development of a turbulent boundary layer interacting with controlled longitudinal vortex arrays that were artifically generated from tiny airfoils arranged side by side in the free stream. Five arrangements varying in spacing between neighboring airfoils and distance of airfoil arrays from the test wall were studied. Within the boundary layer, there is spanwise transport of streamwise momentum due to pairs of counterrotating secondary flows. As a result, a spanwise periodic variation corresponding to the spanwise arrangement of airfoil elements arises in the mean flowfield and persists in the far-downstream region. The spacing between neighboring airfoils leads to a significant effect on the streamwise path of longitudinal vortices, which significantly affect the magnitude of boundary layer distortion. Even in the present three-dimensional flowfield, the streamwise velocity profiles collapse reasonably well on the standard logarithmic law of the wall. However, the wake region of logarithmic profiles is different at representative spanwise locations.
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