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Intensity-Analysis of Cross-Correlated Synchronized PIV and Microphone Measurements

Siegel, Lars and Henning, Arne and Ehrenfried, Klaus and Wagner, Claus (2015) Intensity-Analysis of Cross-Correlated Synchronized PIV and Microphone Measurements. 17. STAB-Workshop, 10.-11. November 2015, Göttingen, Deutschland.

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Official URL: http://www.dlr.de/agstab

Abstract

An approach towards the identification of flow structures related to the aeroacoustic source mechanism in turbulent flows is presented. The new methodology is based on an analysis of the generalized intensity which is obtained considering an acoustic analogy and the existence of an energy conservation principle. The intensity distribution in the flow-field is derived from the correlation matrix, resulting from velocity fluctuations in the flow field captured via particle image velocimetry (PIV) and from the pressure field in the acoustic far-field. The approach is applied to two flow cases, namely a cylinder wake and the slat flow of a high lift configuration. Regions of effective production of fluctuation energy are identified, allowing conclusions about noise sources in the turbulent flow region.

Item URL in elib:https://elib.dlr.de/98521/
Document Type:Conference or Workshop Item (Speech)
Title:Intensity-Analysis of Cross-Correlated Synchronized PIV and Microphone Measurements
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Siegel, Larslars.siegel (at) dlr.deUNSPECIFIED
Henning, Arnearne.henning (at) dlr.deUNSPECIFIED
Ehrenfried, Klausklaus.ehrenfried (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 132-133
Series Name:Jahresbericht 2015, STAB-Mitteilung
Status:Published
Keywords:PIV, aeroacoustic, acoustic analogy, noise sources, flow structures, generalized intensity, fluctuation energy, cylinder wake, slat flow
Event Title:17. STAB-Workshop
Event Location:Göttingen, Deutschland
Event Type:Workshop
Event Dates:10.-11. November 2015
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 of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:24 Nov 2015 14:09
Last Modified:10 May 2016 23:32

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