Abstract
The interaction between a flat plate turbulent boundary layer and a 2D synthetic jet has been investigated by means of Digital Particle Image Velocimetry. The flow structure evolution downstream the suction/blowing section has been observed and changes in the mean flow field have been analyzed for different yaw angles of the synthetic jet slit. When the synthetic jet slit is aligned with the mean flow (β=0°) a counter-rotating vortex pair completely embedded in the boundary layer is present. Increasing the yaw angle only one of the two shear layers producing the vortex pair is intensified by the mean flow. The effects of the slit orientation also showed a great influence on the mean velocity profiles as well as on the streamwise and wall normal fluctuations and on the Reynolds shear stresses. For appropriate slit orientations specific zones of the near wall region showed reduced mean velocity gradients and velocity fluctuations. VISA analysis indicate d an increase in the bursting frequency and a weakening of the shear layer events occurring in the region closer to the wall.
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