Control of the separated flow downstream of a two-dimensional fence by low-frequency forcing |
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Authors: | H. A. Siller and H. H. Fernholz |
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Affiliation: | (1) Hermann-F?ttinger-Institut für Str?mungsmechanik, Technische Universit?t Berlin, Stra?e des 17. juni 135, 10623 Berlin, Germany |
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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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Keywords: | turbulent fence-flow flow-control experiments |
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