Abstract
Streamwise distributions of wall shear-stress, reverse-flow-factor and static pressure were measured in the turbulent separation regions upstream and downstream of a two-dimensional fence. In front of the fence, boundary layer profiles were measured with a pulsed-wire probe traversing out of the wall. The flow was then manipulated by a periodic disturbance which was located upstream of the forward separation region. Two different disturbances were tested: an oscillating spoiler and a two-dimensional oscillating jet with zero mean mass flow, driven by a loudspeaker. Both manipulators were orientated parallel to the fence. With appropriate tuning of the parameters, the reattachment length behind the fence could be reduced by 50%.
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Siller, H.A., Fernholz, H.H. Control of the separated flow downstream of a two-dimensional fence by low-frequency forcing. Appl. Sci. Res. 57, 309–318 (1996). https://doi.org/10.1007/BF02506066
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DOI: https://doi.org/10.1007/BF02506066