A threedimensional turbulent boundary layer undergoing transverse strain and streamwise pressure gradient
Abstract
Results from an experimental investigation designed to provide data on both mean and turbulence quantities in the axisymmetric, swirling boundary layer (with and without pressure gradient) flowing over a stationary cylinder downstreams of a spinning cylindrical section are presented. The pressure gradient was introduced into the flow field by a 25.4 mmhigh, forwardfacing, circular step mounted on the stationary cylinder, the step height being nearly equal to the thickness of the approaching boundary layer. All the measurements were made at a nominal upstream reference Reynolds number of 2.4 x 10 to the 6th power/m (corresponding to an upstream reference velocity of 36 to 37 m/sec) with the rotation of the spinner set to make its peripheral speed equal the reference velocity. The data reported included measurements of surface pressure and the mean surface shearstress vector taken with a miniature, directional, surfacefence gage. These measurements were supplemented by oilflow visualization studies of the stationary cylinder. The data indicates that the streamwise pressure gradient controls the development of the streamwise component of wall shear, but leaves the peripheral component of wall shear practically unaffected.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 August 1985
 Bibcode:
 1985STIN...8534358H
 Keywords:

 Flow Distribution;
 Pressure Gradients;
 Skin Friction;
 Turbulent Boundary Layer;
 Prediction Analysis Techniques;
 Shear Stress;
 Turbulent Wakes;
 Fluid Mechanics and Heat Transfer