Measurements in a pressure-driven three-dimensional turbulent boundary layer during development and decay

Measurements of the turbulence structure in the outer layer of a three-dimensional turbulent boundary layer were made in an open-circuit low-speed blower tunnel. The three-dimensional turbulent boundary layer on the floor of the tunnel was generated by a cross-stream pressure gradient using a 30-deg bend in the horizontal plane. Downstream of the bend, the three-dimensional turbulent boundary layer gradually relaxed toward a two-dimensional turbulent boundary layer as the crossflow decayed slowly after the cross-stream pressure gradient was removed. Mean velocities were measured with a three-hole pressure probe, and turbulence quantities, which included the Reynolds-stress tensor and the triple products, were measured with a cross-wire hot-wire anemometer

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