Abstract
Three-dimensional flowfield measurements were made near a transonic slotted wall. Field velocity vectors and static pressure distributions have been obtained. The boundary-layer displacement thickness was found to vary in the transverse plane with its maximum at the slot centerline but decreased with increasing suction rate through the slot. The boundary-layer characteristics were sensitive to the mass transfer through the slot. The projection of the flowfield velocity vectors on the transverse plane revealed a vortex-like flow formation. The center of this secondary flow was located nearly at the edge of the wall shear layer and decreased in strength with applied suction. The secondary vortex motion may be attributed to the mean flow skewing, inhomogeneous transverse plane boundary layer, and the wall turbulence anisotropy. These sources produced rotation of opposite sense and their contributions varied with the suction rate.
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