Non-Steady Flow Over a Trailing Edge — An Experimental Study
The forced non-steady velocity field of the flow over the edge of a back-facing step is measured by means of a Laser-Doppler-Anemometer. The velocity field is obtained as close as 0.2 mm away from the wall and we are able to resolve the Stokes layer of the incoming flow. The perturbation of the shear-layer is discussed and the vorticity in the downstream region is evaluated from the velocity field. Additionally the displacement of the separation streak line was visualized. The wavelength of the shear-layer perturbation as obtained from the streak line was found to be significantly smaller than that obtained from the velocity field.
KeywordsShear Layer Strouhal Number Perturbation Velocity Instability Wave Momentum Thickness
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