Please use this identifier to cite or link to this item: http://bura.brunel.ac.uk/handle/2438/29056
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dc.contributor.authorBiedermann, TM-
dc.contributor.authorScholz, M-
dc.contributor.authorChong, TP-
dc.date.accessioned2024-05-24T11:30:58Z-
dc.date.available2024-05-24T11:30:58Z-
dc.date.issued2024-08-28-
dc.identifierORCiD: Till M Biedermann https://orcid.org/0000-0002-9635-7949-
dc.identifierORCiD: Tze Pei Chong https://orcid.org/0000-0002-5272-3943-
dc.identifier.citationBiedermann, 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.en_US
dc.identifier.issn1475-472X-
dc.identifier.urihttps://bura.brunel.ac.uk/handle/2438/29056-
dc.descriptionData Availability: The data that support the findings of this study are available from the corresponding author upon reasonable request.en_US
dc.description.abstractHeavy-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.en_US
dc.description.sponsorshipThis study is supported by the Engineering and Physical Sciences Research Council inthe United Kingdom through research grant No. EP/V006886/1, and the PhD studentship sponsored by theDoctoral Training Partnership.en_US
dc.format.extent1 - 24-
dc.format.mediumPrint-Electronic-
dc.language.isoenen_US
dc.publisherSAGE Publicationsen_US
dc.rightsCopyright © 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).-
dc.rights.urihttps://us.sagepub.com/en-us/nam/journal-author-archiving-policies-and-re-use-
dc.subjectaeroacousticsen_US
dc.subjectcentrifugal fanen_US
dc.subjectaerodynamicsen_US
dc.subjectoptimisationen_US
dc.titleAeroacoustic assessment of porous blade treatment applied to centrifugal fansen_US
dc.typeArticleen_US
dc.date.dateAccepted2024-05-12-
dc.identifier.doihttps://doi.org/10.1177/1475472X241278645-
dc.relation.isPartOfInternational Journal of Aeroacoustics-
pubs.issue00-
pubs.publication-statusPublished online-
pubs.volume0-
dc.identifier.eissn2048-4003-
dc.rights.holderThe Author(s)-
Appears in Collections:Dept of Mechanical and Aerospace Engineering Research Papers

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