Laboratory measurements are made of flow over a blunt flat plate of finite thickness, which is placed in a pulsating free stream, U=U o (1+A o cos 2πf p t). Low turbulence-intensity wind tunnel experiments are conducted in the ranges of St p≤1.23 and A o ≤0.118 at Re H=560. Pulsation is generated by means of a woofer speaker. Variations of the time-mean reattachment length x R as functions of St p and A o are scrutinized by using the forward-time fraction and surface pressure distributions (C p). The shedding frequency of large-scale vortices due to pulsation is measured. Flow visualizations depict the behavior of large-scale vortices. The results for non-pulsating flows (A o =0) are consistent with the published data. In the lower range of A o , as St p increases, x R attains a minimum value at a particular pulsation frequency. For large A o , the results show complicated behaviors of x R. For St p≥0.80, changes in x R are insignificant as A o increases. The shedding frequency of large-scale vortices is locked-in to the pulsation frequency. A vortex-pairing process takes place between two neighboring large-scale vortices in the separated shear layer.
Experiments in Fluids – Springer Journals
Published: Feb 6, 2001
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