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Influence of span-wise coherence in a cylinder wake on the acoustic radiations

Siegel, Lars and Henning, Arne and Mulleners, Karen and He, Guosheng (2022) Influence of span-wise coherence in a cylinder wake on the acoustic radiations. In: 20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics 2022, pp. 1-14. 20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics, 2022-07-11 - 2022-07-14, Lisbon, Portugal. ISBN 978-989-53637-0-4.

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Official URL: http://www.lisbon-lasersymposium.org/LXLASER2022

Abstract

In the present work the influence of the spanwise coherence of the flow structures on the acoustic emission in the case of cylinder wakes is investigated. For this purpose, the correlation between pressure fluctuations in the far field and velocity fluctuations in the wake of the cylinders of different shapes is determined experimentally by means of the so called causality correlation. 2D-2C as well as 2D-3C PIV is applied to determine the velocity fluctuations. The pressure fluctuations in the far field are measured synchronously with microphones. From the temporal and spatial distribution of the correlation results, conclusions are drawn about the dependence between the coherence of the vortex structures convecting downstream of the cylinder and the tonal components in the acoustic signature. Most interestingly, in case of a tapered cylinder geometry the temporal evolution of the correlation function shows an asymmetry, which has not been observed in previous results.

Item URL in elib:https://elib.dlr.de/187895/
Document Type:Conference or Workshop Item (Speech)
Title:Influence of span-wise coherence in a cylinder wake on the acoustic radiations
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Siegel, LarsUNSPECIFIEDhttps://orcid.org/0000-0002-5601-3826UNSPECIFIED
Henning, ArneUNSPECIFIEDhttps://orcid.org/0000-0002-2806-8213UNSPECIFIED
Mulleners, KarenEPFL, LausanneUNSPECIFIEDUNSPECIFIED
He, GuoshengUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:July 2022
Journal or Publication Title:20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics 2022
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1-14
Editors:
EditorsEmailEditor's ORCID iDORCID Put Code
UNSPECIFIEDADAI - Association for the Development of Industrial Aerodynamics Center for Innovation, Technology and Policy Research IN+UNSPECIFIEDUNSPECIFIED
ISBN:978-989-53637-0-4
Status:Published
Keywords:aeroacoustics, PIV, causality correlation
Event Title:20th International Symposium on Application of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Start Date:11 July 2022
Event End Date:14 July 2022
Organizer:ADAI - Association for the Development of Industrial Aerodynamics Center for Innovation, Technology and Policy Research IN+
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Transport System
DLR - Research area:Transport
DLR - Program:V VS - Verkehrssystem
DLR - Research theme (Project):V - VMo4Orte - Vernetzte Mobilität für lebenswerte Orte
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Henning, Arne
Deposited On:19 Aug 2022 16:29
Last Modified:24 Apr 2024 20:49

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