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Insights Into The Acoustic Near And Far Field Based On Synchronized PIV And Microphone Measurements

Siegel, Lars and Henning, Arne and Ehrenfried, Klaus and Wagner, Claus (2018) Insights Into The Acoustic Near And Far Field Based On Synchronized PIV And Microphone Measurements. 19th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 16.-19. Juli 2018, Lisbon, Portugal.

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Official URL: http://lisbon-lasersymposium.org/lxlaser2018

Abstract

The aim of this study is to detect and visualize the propagating sound waves emanating from a flow around different types of rods. For this purpose, synchronous Particle Image Velocimetry (PIV) and microphone measurements were performed in an aeroacoustic wind tunnel. The velocity fluctuations were recorded not only in the vicinity of the rods but also in several regions between the wake flow field and the far field microphone. By means of the correlation between velocity and pressure fluctuations, coherent structures within and outside the flow could be identified. In particular, the temporal and spatial development of these structures provides an insight into the sound generation mechanism and the transition between the acoustic near and far field. The results are compared with analytical and numerical solutions.

Item URL in elib:https://elib.dlr.de/119732/
Document Type:Conference or Workshop Item (Speech)
Title:Insights Into The Acoustic Near And Far Field Based On 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:16 July 2018
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Aeroacoustics, PIV, Causality Correlation
Event Title:19th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:16.-19. Juli 2018
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: Henning, Arne
Deposited On:17 Aug 2018 11:53
Last Modified:31 Jul 2019 20:17

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