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Experimental wind-tunnel results for radiation of sound from semi-buried ducts

Mößner, Michael and Delfs, Jan Werner and Pott-Pollenske, Stephan-Michael (2022) Experimental wind-tunnel results for radiation of sound from semi-buried ducts. Deutsche Gesellschaft für Luft- und Raumfahrt. Deutscher Luft- und Raumfahrtkongress 2022, 27-29 Sep 2022, Dresden, Germany. doi: 10.25967/570075.

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Official URL: https://www.dglr.de/nc/publikationen/deutscher-luft-und-raumfahrtkongress-2022-netzpublikationen/nach-datum/

Abstract

Semi-buried engines are part of of many future aircraft designs. From acoustic’s point of view the increased noise shielding is one of the potential benefits. But at the same time the fan will experience a disturbed inflow which can lead to additional noise. In order to assess such new concepts numerical predictions can help, but it at the same time it is important to validate the methods against experimental data. The current paper describes a wind tunnel experiment which can serve as a validation case. The setup consists of a duct which is mounted on a flat plate. The whole model is placed inside a wind tunnel and tested with different flow speeds. Upstream the duct, a boundary layer develops which enters the duct, imitating boundary layer ingestion. The sound is generated by a specially designed source that it can be easily translated to computational methods. All important design details are given which makes it possible to use it as a benchmark case for numerical methods. The sound radiation is measured upstream the duct. Since the sound source operates at dedicated frequencies, clear interference patterns become visible. Such patterns can help to make small configuration changes visible (e.g. different flow speeds). The results serve as a starting point for detailed studies of flow and boundary layer effects on sound radiation from a duct. Numerical methods can be validated against the given result and extend the parameter range e.g. to much thicker boundary layers as well as recording results at much larger evaluation planes. However, such numerical studies are beyond the scope of this paper.

Item URL in elib:https://elib.dlr.de/192414/
Document Type:Conference or Workshop Item (Speech)
Title:Experimental wind-tunnel results for radiation of sound from semi-buried ducts
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Mößner, MichaelUNSPECIFIEDhttps://orcid.org/0000-0002-6355-4436UNSPECIFIED
Delfs, Jan WernerUNSPECIFIEDhttps://orcid.org/0000-0001-8893-1747UNSPECIFIED
Pott-Pollenske, Stephan-MichaelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:16 December 2022
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI:10.25967/570075
Publisher:Deutsche Gesellschaft für Luft- und Raumfahrt
Status:Published
Keywords:BLI, wind tunnel experiments, sound radiation
Event Title:Deutscher Luft- und Raumfahrtkongress 2022
Event Location:Dresden, Germany
Event Type:national Conference
Event Dates:27-29 Sep 2022
Organizer:DGLR
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Efficient Vehicle
DLR - Research area:Aeronautics
DLR - Program:L EV - Efficient Vehicle
DLR - Research theme (Project):L - Virtual Aircraft and  Validation
Location: Braunschweig
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Mößner, Michael
Deposited On:20 Dec 2022 10:36
Last Modified:27 Jul 2023 09:32

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