<p>Unstable flow patterns around arrangements of bluff bodies in different engineering applications can give rise to periodic pressure oscillations, and may lead to excitation of strong acoustic resonance that can interrupt operation. In certain conditions, flow fluctuations arising from vortex shedding downstream of a single circular cylinder has been reported to excite severe acoustic resonance. On the other hand, cylinders of a square cross section are known to be specially susceptible to mechanisms that involve coupling between the flow and a structural mode. It is not known, however, if such coupling would occur between an acoustic mode and flow fluctuations downstream of a square cylinder. In this work, the possibility of excitation of acoustic resonance due to coupling between unsteady flow downstream of a single square cylinder with an acoustic cross mode of a rectangular duct is experimentally investigated. During the experiments, acoustic resonance at the frequency of the acoustic cross-modes was self-excited. Measurements of the acoustic pressure and the flow velocity are carried out for a single square cylinder of an edge length of 25.4 mm. It is found that the characteristics of the aeroacoustic response for this configuration are not completely analogous to the case of a circular cylinder, with a number of features not observed before.&nbsp; A brief summary of the results is presented in this paper.</p>

The Aeroacoustic Response of a Single Square Cylinder in Confined Cross Flow

Paper Proceedings: https://asmedigitalcollection.asme.org/PVP/PVP2021/volume/85314

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