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Causality Correlation in Aeroacoustic Experiments by Means of Simultaneous PIV and Microphone-Array Measurements

Henning, Arne and Koop, Lars and Ehrenfried, Klaus (2010) Causality Correlation in Aeroacoustic Experiments by Means of Simultaneous PIV and Microphone-Array Measurements. BeBeC Berlin Beamforming Conference, 24.-25. Feb. 2010, Berlin, Germany. ISBN 978-3-00-030027-1.

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Official URL: http://www.bebec2010.com

Abstract

In this paper we present applications of the causality correlation technique by means of simultaneous PIV measurements in a turbulent flow and microphone-array measurements in the aeroacoustic far field of the flow. Both measurements were conducted in a synchronized manner so as to enable the calculation of the cross-correlation between the acoustic pressure and flow quantities derived from the measured velocity fluctuations. The main idea of the concept presented here is to use the coefficient matrix obtained from the aforementioned correlation to identify regularities in the near-field fluctuations that are related to the radiated sound field. The method is used for the identification of flow structures that are involved in the generation mechanism of aeroacoustic noise sources. Results for measurements on a Rod-Airfoil configuration with a strong tonal component in the acoustic far-field as well as for a cold jet with a broadband spectrum are presented.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Causality Correlation in Aeroacoustic Experiments by Means of Simultaneous PIV and Microphone-Array Measurements
Authors:
AuthorsInstitution or Email of Authors
Henning, ArneTU-Berlin
Koop, LarsUNSPECIFIED
Ehrenfried, KlausUNSPECIFIED
Date:2010
Page Range:pp. 1-13
Series Name:Conference Proceedings
ISBN:978-3-00-030027-1
Status:Published
Keywords:Microphone-Array Measurements, Aeroacoustic, PIV
Event Title: BeBeC Berlin Beamforming Conference
Event Location:Berlin, Germany
Event Type:international Conference
Event Dates:24.-25. Feb. 2010
Organizer:Gfal, DLR und TU-Berlin
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Helicopters
Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:02 Mar 2010 13:27
Last Modified:02 Mar 2010 13:27

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