Abstract
The effects of localized injection through a porous strip on a turbulent boundary layer at zero pressure gradient conditions were examined experimentally. The magnitude of the injection velocity was kept very small (less than 1% of the free-stream velocity) to prevent separation near the injection strip and to keep the perturbations small. It was found that the injection increases all the Reynolds stresses and that this perturbation dies out very slowly as the affected layer is sandwiched between the outer edge of the incoming boundary layer and a new layer that develops at the wall. A study of the anisotropy tensor indicated no effects of the blowing rate on the flow anisotropy downstream of the injection region, although a quadrant analysis showed that the contributions to the shear stresses from the various quadrants were affected.
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