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Causality Correlation Analysis for Aeroacoustics using PIV in the Near-Field

Henning, Arne und Koop, Lars und Schröder, Andreas (2012) Causality Correlation Analysis for Aeroacoustics using PIV in the Near-Field. International Workshop on the Application of Particle Image Velocimetry for Aeroacoustics and Noise, 16. - 18. Apr. 2012, Delft, The Netherlands.

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Offizielle URL: http://www.afdar-aeroacoustics.nl


The investigation of the cause and effect relationship between near-field quantities in a turbulent flow and associated pressure fluctuations in the far-field is of great interest in aeroacoustic research. Common approaches for the prediction of the acoustic far-field from the near-field data are mostly based on an acoustic analogy, where the source strength is determined by experiments or numerical simulations. In this way it is possible to estimate how much noise is generated in a certain flow field. But typically the source strengths in the near-field largely cancel themselves out and only a relatively small portion radiates to the far-field. To predict this destructive interference correctly, the sources have to be determined with high accuracy in the complete source domain. Additionally a far-field prediction does not necessarily give a deep insight into the source process itself. Often, even the simple question of where the sound comes from cannot be unequivocally answered. The attempt to answer this question is to measure simultaneously the acoustic pressure in the far-field together with some other near-field quantity. In this manner the far-field pressure can be correlated with the near-field quantity to identify flow structures which are subject to the same physical phenomenon as the aeroacoustic sources in a statistical manner. In the short review presented here we are describing its implementation by means of cross correlating the far-field radiated sound pressure of different flow configurations with velocity fluctuations in the near-field measured via PIV.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Causality Correlation Analysis for Aeroacoustics using PIV in the Near-Field
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Referierte Publikation:Nein
In Open Access:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-6
Name der Reihe:Book of Abstracts
Stichwörter:cross correlation, aeroacoustic, PIV, microphone
Veranstaltungstitel:International Workshop on the Application of Particle Image Velocimetry for Aeroacoustics and Noise
Veranstaltungsort:Delft, The Netherlands
Veranstaltungsdatum:16. - 18. Apr. 2012
Veranstalter :Deft University of Technology, Delft, NL
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Simulation & Validierung (alt)
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Experimentelle Verfahren
Hinterlegt von: Micknaus, Ilka
Hinterlegt am:19 Apr 2012 09:11
Letzte Änderung:09 Okt 2012 15:04

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