Wind-Induced Noise of Architectural Perforated Plates
Perforated plates are a popular architectural feature found on the outside faces of buildings. These plates are known to produce flow-induced noise when exposed to high winds. While this noise is generally broadband, for certain plate geometries, flow velocities, and angles of incidence, highly tonal noise is produced, the level of which can be much higher than that of the broadband noise. This is an irritant for inhabitants of the building and the surrounding area and may lead to costly retrofitting to eliminate the problem.
Many studies can be found in the literature for flow over perforated plates at a parallel or perpendicular direction. However, the literature is very limited with regards to flow over perforated plates at oblique angles of incidence. For architectural applications, the direction of the wind is naturally unpredictable, so the effect of different angles of incidence is an important consideration.As a preliminary investigation, a simplified model of a perforated plate is used. The circular holes of a typical perforated plate are replaced by a series of long rectangular slats with an adjustable gap width between them. This simplified model is studied experimentally in a wind tunnel for various angles of incidence and flow velocities. The acoustic response is studied using microphone measurements, and flow visualization is done using particle image velocimetry. It is found that tonal noise is produced for angles of incidence of 5 to 30 degrees from parallel. The Strouhal number of these tones agrees well with those produced by a perforated plate. Outside of this range of angles, the noise is broadband. The flow visualization reveals that this tonal noise is caused by the periodic shedding and impingement of vortices on the downstream edge of the holes.
How to Cite
Copyright on articles is held by the author(s). The corresponding author has the right to grant on behalf of all authors and does grant on behalf of all authors, a worldwide exclusive licence (or non-exclusive license for government employees) to the Publishers and its licensees in perpetuity, in all forms, formats and media (whether known now or created in the future)
i) to publish, reproduce, distribute, display and store the Contribution;
ii) to translate the Contribution into other languages, create adaptations, reprints, include within collections and create summaries, extracts and/or, abstracts of the Contribution;
iii) to exploit all subsidiary rights in the Contribution,
iv) to provide the inclusion of electronic links from the Contribution to third party material where-ever it may be located;
v) to licence any third party to do any or all of the above.