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CHARACTERIZATION OF A TANDEM CYLINDER ARRANGEMENT WITH A SLANTED CYLINDER
Omar El Moghany, Philippe Lavoie, Joseph Hall

Last modified: 2018-04-16

Abstract


The fluidic structures associated with aeroacoustic noise are investigated for a tandem cylinder arrangement. An ensemble of a vertical cylinder and another counterpart, slanted to the freestream flow, define the arrangement. The orientation of an upstream slanted cylinder ahead of a vertical one and the reverse orientation are tested via hotwire anemometry, surface pressure microphones embedded within the cylinders, and planar PIV in an anechoic, open-jet wind tunnel. The flow structures observed via a hotwire technique and PIV are correlated to the fluctuating and mean surface pressures to identify the structures that cause the most significant pressure fluctuations at the downstream cylinder surface. The aim of this analysis is to identify the turbulent mechanisms causing the dominant sound emissions from the gap between the cylinders and the wake of the downstream cylinder. The paper will particularly focus on contrasting the differences in the nature of the turbulence, and consequential sound generation mechanisms, present around the tandem cylinder arrangement. Finally, the effect of the streamwise gap length will be investigated by varying the angle of the slanted cylinder.


Keywords


vortex-shedding; aeroacoustics; flow-induced noise

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