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

Henning, Arne and Koop, Lars and 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.

Full text not available from this repository.

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

Abstract

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.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:Causality Correlation Analysis for Aeroacoustics using PIV in the Near-Field
Authors:
AuthorsInstitution or Email of Authors
Henning, ArneTU-Berlin
Koop, LarsUNSPECIFIED
Schröder, AndreasUNSPECIFIED
Date:2012
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-6
Series Name:Book of Abstracts
Status:Published
Keywords:cross correlation, aeroacoustic, PIV, microphone
Event Title:International Workshop on the Application of Particle Image Velocimetry for Aeroacoustics and Noise
Event Location:Delft, The Netherlands
Event Type:Workshop
Event Dates:16. - 18. Apr. 2012
Organizer:Deft University of Technology, Delft, NL
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation & Validation
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:19 Apr 2012 09:11
Last Modified:09 Oct 2012 15:04

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