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Cross-correlation analysis of synchronized PIV and microhone measurements of an oscillating airfoil

Siegel, Lars and Ehrenfried, Klaus and Wagner, Claus and Mulleners, Karen and Henning, Arne (2018) Cross-correlation analysis of synchronized PIV and microhone measurements of an oscillating airfoil. Journal of Visualization. Springer. DOI: 10.1007/s12650-018-0473-7 ISSN 1343-8875

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Official URL: https://link.springer.com/journal/12650

Abstract

The present study focuses on the correlation between the flow structures evolving during the dynamic stall processes of a two-dimensional NACA64-618 airfoil, which performs a sinusoidal movement about its quarter chord axis, and their aeroacoustic response in the far field. Experiments are conducted in an anechoic wind tunnel at a Reynolds number of 8x105 based on the chord length and include simultaneous velocity field measurements in the vicinity of the airfoil and microphone measurements in the acoustic far field. A causality correlation method based on phase locked snapshots of the velocity field allows for the identification of specific structures at different phases of the dynamic stall life cycle that contribute to the sound generation process. The sound emission during the stall development and flow reattachment phases is attributed to coherent structures evolving downstream of the trailing edge. When the flow is fully stalled, the region that contributes to the sound emission increases. The position of the sound emitting coherent structures also fluctuates stronger between oscillation cycles during full stall.

Item URL in elib:https://elib.dlr.de/114855/
Document Type:Article
Additional Information:https://link.springer.com/article/10.1007/s12650-018-0473-7; Print ISSN: 1343-8875; Online ISSN: 1875-8975
Title:Cross-correlation analysis of synchronized PIV and microhone measurements of an oscillating airfoil
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Siegel, LarsLars.Siegel (at) dlr.deUNSPECIFIED
Ehrenfried, Klausklaus.ehrenfried (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Mulleners, Karenepfl, lausanneUNSPECIFIED
Henning, Arnearne.henning (at) dlr.deUNSPECIFIED
Date:2018
Journal or Publication Title:Journal of Visualization
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1007/s12650-018-0473-7
Publisher:Springer
Series Name:Springer Berlin Heidelberg
ISSN:1343-8875
Status:Published
Keywords:PIV, Aero-acoustics, Dynamic stall, Cross-correlation, Coherent structures
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Fluid Systems, GO
Deposited By: Bachmann, Barbara
Deposited On:20 Mar 2018 15:31
Last Modified:31 Jul 2019 20:12

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