Academic Journal
Acoustic design evaluation of an anechoic wind tunnel.
| Τίτλος: | Acoustic design evaluation of an anechoic wind tunnel. |
|---|---|
| Συγγραφείς: | Lylloff, Oliver1 (AUTHOR) ollyl@dtu.dk, Fischer, Andreas1 (AUTHOR), Fernandez-Grande, Efren2 (AUTHOR), Bak, Christian1 (AUTHOR) |
| Πηγή: | International Journal of Aeroacoustics. Jun2026, Vol. 25 Issue 3/4, p459-477. 19p. |
| Θεματικοί όροι: | *Wind tunnels, *Acoustical engineering, *Turbulent boundary layer, *Noise control, *Noise, *Finite element method, *Impulse response |
| Περίληψη: | This paper presents the acoustic design of a new anechoic wind tunnel and its evaluation through simulations and experiments. An experimental method is proposed to estimate, in situ, the individual transmission losses of acoustically treated guide vanes and diffuser, without flow, from measured impulse responses. Results are compared with finite element simulations, showing comparable 1/3-octave transmission losses from 1 to 5 kHz; however, the simulations are highly sensitive to the material properties in the impedance model. The total background noise in the wind tunnel test section is estimated from transmission losses and compared with measurements at 70 m/s flow. Below 200 Hz, agreement is good; at higher frequencies, measured noise is up to 30 dB higher due to turbulent boundary layer and Kevlar roughness noise. An airfoil noise benchmark is also presented, showing a single-microphone signal-to-noise ratio up to 8 dB below 1–2 kHz. [ABSTRACT FROM AUTHOR] |
| Βάση Δεδομένων: | Academic Search Index |
| FullText | Text: Availability: 0 |
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| Header | DbId: asx DbLabel: Academic Search Index An: 193525873 RelevancyScore: 1431 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 1430.76538085938 |
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| Items | – Name: Title Label: Title Group: Ti Data: Acoustic design evaluation of an anechoic wind tunnel. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Lylloff%2C+Oliver%22">Lylloff, Oliver</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> ollyl@dtu.dk</i><br /><searchLink fieldCode="AR" term="%22Fischer%2C+Andreas%22">Fischer, Andreas</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Fernandez-Grande%2C+Efren%22">Fernandez-Grande, Efren</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bak%2C+Christian%22">Bak, Christian</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22International+Journal+of+Aeroacoustics%22">International Journal of Aeroacoustics</searchLink>. Jun2026, Vol. 25 Issue 3/4, p459-477. 19p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Wind+tunnels%22">Wind tunnels</searchLink><br />*<searchLink fieldCode="DE" term="%22Acoustical+engineering%22">Acoustical engineering</searchLink><br />*<searchLink fieldCode="DE" term="%22Turbulent+boundary+layer%22">Turbulent boundary layer</searchLink><br />*<searchLink fieldCode="DE" term="%22Noise+control%22">Noise control</searchLink><br />*<searchLink fieldCode="DE" term="%22Noise%22">Noise</searchLink><br />*<searchLink fieldCode="DE" term="%22Finite+element+method%22">Finite element method</searchLink><br />*<searchLink fieldCode="DE" term="%22Impulse+response%22">Impulse response</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: This paper presents the acoustic design of a new anechoic wind tunnel and its evaluation through simulations and experiments. An experimental method is proposed to estimate, in situ, the individual transmission losses of acoustically treated guide vanes and diffuser, without flow, from measured impulse responses. Results are compared with finite element simulations, showing comparable 1/3-octave transmission losses from 1 to 5 kHz; however, the simulations are highly sensitive to the material properties in the impedance model. The total background noise in the wind tunnel test section is estimated from transmission losses and compared with measurements at 70 m/s flow. Below 200 Hz, agreement is good; at higher frequencies, measured noise is up to 30 dB higher due to turbulent boundary layer and Kevlar roughness noise. An airfoil noise benchmark is also presented, showing a single-microphone signal-to-noise ratio up to 8 dB below 1–2 kHz. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1177/1475472X261419076 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 19 StartPage: 459 Subjects: – SubjectFull: Wind tunnels Type: general – SubjectFull: Acoustical engineering Type: general – SubjectFull: Turbulent boundary layer Type: general – SubjectFull: Noise control Type: general – SubjectFull: Noise Type: general – SubjectFull: Finite element method Type: general – SubjectFull: Impulse response Type: general Titles: – TitleFull: Acoustic design evaluation of an anechoic wind tunnel. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Lylloff, Oliver – PersonEntity: Name: NameFull: Fischer, Andreas – PersonEntity: Name: NameFull: Fernandez-Grande, Efren – PersonEntity: Name: NameFull: Bak, Christian IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2026 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 1475472X Numbering: – Type: volume Value: 25 – Type: issue Value: 3/4 Titles: – TitleFull: International Journal of Aeroacoustics Type: main |
| ResultId | 1 |