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Analysis of the Noise Shielding Characteristics of a NACA0012 2D Wing

Rossignol, Karl-Stéphane und Delfs, Jan Werner (2016) Analysis of the Noise Shielding Characteristics of a NACA0012 2D Wing. In: 22nd AIAA/CEAS Aeroacoustics Conference, 2016. 22nd AIAA/CEAS Aeroacoustics Conference, Lyon. doi: 10.2514/6.2016-2795.

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Kurzfassung

A laser-generated non-intrusive impulsive sound source is used to perform shield- ing experiments in the acoustic wind tunnel Braunschweig at a generic 2D wing with NACA0012 profile. The sound source was already shown in previous reports to have a monopole-like character with a nearly omni-directional sound radiation pattern, both in stagnant medium and in a flow field. In the current report, emphasis is first put on the analysis of the data post-processing steps required for the obtention of correct spectral and time domain data for the laser sound source. In particular, the subject of microphone corrections is reconsidered in details. A missing free-field correction of the results in,1 is corrected herein to reveal the correct time domain evolution of the generated pressure pulses. Further, non-linear propagation effects are considered. It is found that sound attenuation due to atmospheric absorption does have a non-negligible broadband impact on the far-field source noise levels, increasing in importance with mi- crophone distance. Other non-linear effects related to high-amplitude wave propagation i.e. wave steepening and higher rates of attenuation with far-field distance, could not be observed herein. Noise shielding results are presented for two Mach number values and three angles of attack. Except for a source location in the proximity of the trailing edge, the flow is found to have no measurable influence on the shielding characteristics of the NACA0012 wing for the experimental setup considered. For a source near the trailing edge, a reduced noise shielding is measured upstream of the trailing edge. It is postulated, that noise is generated through the interaction of the source sound wave with the trailing edge, and that it is amplified in the forward arc according to the mean flow field velocity.

elib-URL des Eintrags:https://elib.dlr.de/109597/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Analysis of the Noise Shielding Characteristics of a NACA0012 2D Wing
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iDORCID Put Code
Rossignol, Karl-Stéphanekarl-stephane.rossignol (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Delfs, Jan Wernerjan.delfs (at) dlr.deNICHT SPEZIFIZIERTNICHT SPEZIFIZIERT
Datum:2016
Erschienen in:22nd AIAA/CEAS Aeroacoustics Conference, 2016
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Ja
In ISI Web of Science:Nein
DOI:10.2514/6.2016-2795
Status:veröffentlicht
Stichwörter:Aeroacoustics Sound shielding noise shielding Sound source laser Sound source
Veranstaltungstitel:22nd AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Lyon
Veranstaltungsart:internationale Konferenz
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Flugzeuge
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Aircraft Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Technische Akustik
Hinterlegt von: Rossignol, Karl-Stephane
Hinterlegt am:15 Dez 2016 10:43
Letzte Änderung:18 Jul 2023 16:20

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