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Investigation of the acoustic particle velocity using synchronized non-invasive measurements in the near and far field of a turbulent flow

Siegel, Lars and Henning, Arne and Ehrenfried, Klaus and Wagner, Claus (2020) Investigation of the acoustic particle velocity using synchronized non-invasive measurements in the near and far field of a turbulent flow. Journal of Sound and Vibration, 493, pp. 1-44. Elsevier. doi: 10.1016/j.jsv.2020.115820. ISSN 0022-460X.

Full text not available from this repository.

Official URL: https://doi.org/10.1016/j.jsv.2020.115820

Abstract

The sound generation of an aeroacoustic source with dominating tonal components and the propagation into the acoustic far field is investigated based on measurements of the flow around a square rod - mounted horizontally in an open-jet closed-circuit anechoic wind-tunnel - at a Reynolds number of 6×10^4. Pressure time series are measured with microphones in the far field while velocity field measurements are performed simultaneously with the non-invasive particle image velocimetry (PIV) technique in the flow field. It is shown that the propagation of acoustic waves from the source region to the far field can be resolved analyzing additionally flow fields recorded in vertically shifted fields of view, if the time evolution is synchronized properly with the far-field pressure signal. Furthermore, a comparison with two analytical solutions shows that the cross-correlation function of far-field pressure and near-field velocity fluctuations, normalized by the standard deviation of the pressure signal, corresponds to the acoustic particle velocity. However, this only applies to areas where the acoustic fluctuations dominate, i.e. not in the wake or in the free shear layer between the wind tunnel flow and the quiescent air where acoustic fluctuations are superimposed by hydrodynamic ones.

Item URL in elib:https://elib.dlr.de/138979/
Document Type:Article
Title:Investigation of the acoustic particle velocity using synchronized non-invasive measurements in the near and far field of a turbulent flow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Siegel, LarsLars.Siegel (at) dlr.deUNSPECIFIED
Henning, Arnearne.henning (at) dlr.dehttps://orcid.org/0000-0002-2806-8213
Ehrenfried, KlausKlaus.Ehrenfried (at) dlr.deUNSPECIFIED
Wagner, Clausclaus.wager (at) dlr.deUNSPECIFIED
Date:30 October 2020
Journal or Publication Title:Journal of Sound and Vibration
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:493
DOI :10.1016/j.jsv.2020.115820
Page Range:pp. 1-44
Editors:
EditorsEmailEditor's ORCID iD
UNSPECIFIEDElsevierUNSPECIFIED
Publisher:Elsevier
ISSN:0022-460X
Status:Published
Keywords:Aeroacoustics, Particle image velocimetry, Wind tunnel measurements, Bluff body flow, Acoustic particle velocity, Causality correlation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Siegel, Lars
Deposited On:08 Dec 2020 23:43
Last Modified:11 Dec 2020 11:30

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