Abstract
Effects of a free-stream turbulence on a series of two-dimensional separation-reattaching flows (separation bubbles) were investigated experimentally in a low-speed wind tunnel. Models tested were two-dimensional triangular cylinders with a tail plate. Some important properties of the separation bubbles were measured with a split-film sensor driven by constant -temperature hot-wire anemometers. The effect of the turbulence on the reattachment length XR was found not to be uniform with respect to the separation angle. Large-scale vortices were formed by coalescence in the reattaching zone of the shear layer and were shed downstream with a non-dimensional frequency 0.65 ×(free-stream velocity) /XR, which was the same for all the combinations of the separation angle and the free-stream turbulence employed in this study. Geometry of the separated shear layer suggested that the large-scale vortices in the reattaching zone became flatter as XR increased.
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