The low acoustic noise and turbulence wind tunnel of the University of Sao Paulo

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dc.contributor.authorAmaral, F. R.
dc.contributor.authorSerrano Rico, J. C.
dc.contributor.authorBresci, C. S.
dc.contributor.authorBeraldo, M. M.
dc.contributor.authorVictorino, V. B.
dc.contributor.authorGennaro, E. M. [UNESP]
dc.contributor.authorMedeiros, M. A.F.
dc.contributor.institutionAeronautics Institute of Technology (ITA)
dc.contributor.institutionUniversity of Pamplona
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionUniversidade Estadual Paulista (UNESP)
dc.date.accessioned2022-04-28T19:46:05Z
dc.date.available2022-04-28T19:46:05Z
dc.date.issued2021-01-01
dc.description.abstractThis paper introduces the Low Acoustic Noise and Turbulence (LANT) wind tunnel of the Sao Carlos School of Engineering, University of Sao Paulo (USP-EESC), Brazil. The closed-loop wind tunnel features several devices to improve flow uniformity, reduce swirl, and lower the background acoustic noise and turbulence, enabling stability and aeroacoustic experiments. The design criteria was based on the best practices reported, in particular for low turbulence wind tunnels. Yet, these criteria are conflicting and we discuss the decisions that had to be made and present flow quality results that were achieved. The 16-bladed axial fan with 13-blade stators is driven by a variable-speed electric motor. At the corners, 100 mm dense acoustic foam is installed on the vertical walls, floor and ceiling, and the turning vanes are filled with acoustic-absorbing material. The long settling chamber contains a 3.175 mm mesh hexagonal honeycomb and five fine mesh nylon screens, ending in a 7:1 area ratio short contraction. The 3-m long closed-working section has a 1 × 1 m2 cross-section area. At 15 m/s the working section wall boundary layer is less than 100 mm thick, providing an area of at least 800 × 800 mm2 where the streamwise flow uniformity was within 1%. In the 10-30 m/s flow speed range, the turbulence intensity ranged from 0.05% to 0.071% and the background acoustic noise level, obtained with an inflow microphone, ranged from 90 and 110 dB. A benchmark experiment on a flat plate boundary layer produced an almost perfect two-dimensional Blasius profile up to Rex ≈ 2.5 × 106. A beamforming benchmark experiment on aeroacoustics accurately identified the sound emitted by a cylinder immersed in the flow.en
dc.description.affiliationDepartment of Aerodynamics Aeronautics Institute of Technology (ITA)
dc.description.affiliationDepartment of Mechanical Engineering University of Pamplona
dc.description.affiliationDepartment of Aeronautical Engineering University of Sao Paulo (USP)
dc.description.affiliationSao Paulo State University (UNESP)
dc.description.affiliationUnespSao Paulo State University (UNESP)
dc.identifierhttp://dx.doi.org/10.1017/aer.2021.80
dc.identifier.citationAeronautical Journal.
dc.identifier.doi10.1017/aer.2021.80
dc.identifier.issn0001-9240
dc.identifier.scopus2-s2.0-85117396209
dc.identifier.urihttp://hdl.handle.net/11449/222682
dc.language.isoeng
dc.relation.ispartofAeronautical Journal
dc.sourceScopus
dc.subjectAeroacoustic experiments
dc.subjectAerodynamic experiments
dc.subjectBoundary layer experiments
dc.subjectWind tunnel design
dc.titleThe low acoustic noise and turbulence wind tunnel of the University of Sao Pauloen
dc.typeArtigo

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