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      Vortex Shedding Noise from Finite, Wall-Mounted, Circular Cylinders Modified with Porous Material

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      AIAA Journal
      American Institute of Aeronautics and Astronautics

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          Abstract

          The aerodynamic noise generated by a circular cylinder in a crossflow is a classical problem in aeroacoustics, which can be found in various practical applications, such as parts of the landing gear of airplanes, train pantographs, and antennas of vehicles. The noise is especially disturbing because it contains strong tonal contributions due to the regular vortex shedding at the cylinder. If the cylinders are not two-dimensional, but finite and wall-mounted at one end and free at the other, additional flow phenomena occur at both the tip and the wall junction, which can lead to additional noise contributions. One method to reduce the aerodynamic noise from such cylinders is to cover them with a flow-permeable, porous material. The present paper describes an experimental study on the effect of porous covers on the reduction of noise generated by wall-mounted, finite, circular cylinders. Thereby, special focus was put on the identification of both the optimum position and the optimum extent of the porous cover regarding a maximum noise reduction. The experiments included both measurements of the far field noise as well as flow measurements in the wake of the cylinders. They were conducted in an aeroacoustic open jet wind tunnel at subsonic flow speeds. It was found that a placement of porous material at the wall end is more efficient in reducing Kármán vortex shedding noise than a placement of porous material at the free end.

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          Most cited references34

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          Sound Generation by Turbulence and Surfaces in Arbitrary Motion

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            Review and classification of various aerodynamic and hydrodynamic means for suppressing vortex shedding

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              On vortex shedding from a circular cylinder in the critical Reynolds number régime

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                Author and article information

                Conference
                aiaaj
                AIAA Journal
                AIAA Journal
                American Institute of Aeronautics and Astronautics
                1533-385X
                19 February 2020
                May 2020
                : 58
                : 5
                : 2014-2028
                Affiliations
                Brandenburg University of Technology Cottbus–Senftenberg , 03046 Cottbus, Germany
                Author notes
                [*]

                Research Assistant, Technical Acoustics Group.

                Article
                J058877 J058877
                10.2514/1.J058877
                6f32398e-acae-4e5b-b76a-d9d13c1447e5
                Copyright © 2020 by Thomas F. Geyer. Published by the American Institute of Aeronautics and Astronautics, Inc., with permission. All requests for copying and permission to reprint should be submitted to CCC at www.copyright.com; employ the eISSN 1533-385X to initiate your request. See also AIAA Rights and Permissions www.aiaa.org/randp.
                History
                : 23 July 2019
                : 5 December 2019
                : 6 December 2019
                Page count
                Figures: 24, Tables: 1
                Categories
                Regular Articles

                Engineering,Physics,Mechanical engineering,Space Physics
                Engineering, Physics, Mechanical engineering, Space Physics

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