Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/29056
Title: Aeroacoustic assessment of porous blade treatment applied to centrifugal fans
Authors: Biedermann, TM
Scholz, M
Chong, TP
Keywords: aeroacoustics;centrifugal fan;aerodynamics;optimisation
Issue Date: 28-Aug-2024
Publisher: SAGE Publications
Citation: Biedermann, T.M., Scholz, M. and Chong, T.P. (2024) 'Aeroacoustic assessment of porous blade treatment applied to centrifugal fans', International Journal of Aeroacoustics, 0 (ahead of print), pp. 1 - 24. doi: 10.1177/1475472X241278645.
Abstract: Heavy-duty centrifugal fans account for a significant share of energy consumption in the process and manufacturing industries. As a result, these machines are under increasing pressure to operate at maximum efficiency to reduce costs, pollutants and noise: only combined optimization is considered competitive for future generations of fans. Preliminary studies have shown that applying structured porosity to aerofoil rear parts can lead to a reduction in self noise and trailing edge shedding noise in the mid-to-high frequency range. With this in mind, a porous surface cover is applied to a prototype centrifugal fan to evaluate the aeroacoustic potential in a complex rotating machinery. The optimal geometric characteristics of the perforation are derived from experiments with single aerofoils, while the perimeter of the covered area is varied in eight steps. The centrifugal fan specimen is rapid-prototyped and tested at different fan speeds along the complete characteristic curves, while both aerodynamic and aeroacoustic performances are simultaneously recorded. The results obtained show a significant reduction in overall noise level while aerodynamic performance is maintained. Spectral analysis shows that the noise reduction is due to a broadband effect, where the upper and lower cut-off frequencies are determined by the rotational speed and the location of the applied porosity along the blade chord. However, the maximum noise reduction is obtained as a clear function of the minimum distance between the perforation and the trailing edge of the blade, indicating that the underlying working mechanisms are a combination of broadband dissipation effects due to porosity and destructive interference.
Description: Data Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.
URI: https://bura.brunel.ac.uk/handle/2438/29056
DOI: https://doi.org/10.1177/1475472X241278645
ISSN: 1475-472X
Other Identifiers: ORCiD: Till M Biedermann https://orcid.org/0000-0002-9635-7949
ORCiD: Tze Pei Chong https://orcid.org/0000-0002-5272-3943
Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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FullText.pdfCopyright © 2024 The Author(s). Published by SAGE Publications. Biedermann, T.M., Scholz, M, and Chong, T.P..(2024) 'Aeroacoustic assessment of porous blade treatment applied to centrifugal fans', International Journal of Aeroacoustics. 0(0). pp. 1 - 24. DOI URL:https://doi.org/10.1177/1475472X241278645 (see: https://us.sagepub.com/en-us/nam/journal-author-archiving-policies-and-re-use).2.57 MBAdobe PDFView/Open


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