elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Attenuation of low-frequency pressure fluctuations within the test section of an aeroacoustic wind tunnel using Helmholtz resonators

Bald, Alexander and Stahl, Kathrin and Foysi, Holger and Roller, Sabine (2023) Attenuation of low-frequency pressure fluctuations within the test section of an aeroacoustic wind tunnel using Helmholtz resonators. In: Tagungsband: DAGA 2023 - 49. Jahrestagung für Akustik, pp. 1500-1503. Deutsche Gesellschaft für Akustik e.V.. Fortschritte der Akustik - DAGA 2023, 2023-03-06 - 2023-03-09, Hamburg, Deutschland.

[img] PDF
2MB

Abstract

A new aeroacoustic wind tunnel with an open test section was built at the University of Siegen. During the operation, infrasound tonal components and overtones reaching almost 110 dB in amplitude could be observed, sometimes influencing the measurements due to induced vibration of the wind tunnel structure. The present paper demonstrates the application of Helmholtz resonators on a pilot basis, which successfully attenuated these low-frequency peaks drastically. A systematic analysis using Helmholtz resonators with varying neck lengths was conducted. A single Helmholtz resonator, though able to tackle a target frequency, wasn't enough to get rid of other low-frequency components, leading to the use of two resonators. Additionally, the first application of the wind tunnel is shown to get an idea of its capabilities.

Item URL in elib:https://elib.dlr.de/194794/
Document Type:Conference or Workshop Item (Speech)
Title:Attenuation of low-frequency pressure fluctuations within the test section of an aeroacoustic wind tunnel using Helmholtz resonators
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Bald, AlexanderUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stahl, KathrinUNSPECIFIEDhttps://orcid.org/0009-0008-2389-1797135093915
Foysi, HolgerUNSPECIFIEDhttps://orcid.org/0000-0003-2056-6960UNSPECIFIED
Roller, SabineUNSPECIFIEDhttps://orcid.org/0000-0003-1483-8456135093916
Date:9 March 2023
Journal or Publication Title:Tagungsband: DAGA 2023 - 49. Jahrestagung für Akustik
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:pp. 1500-1503
Publisher:Deutsche Gesellschaft für Akustik e.V.
Series Name:Fortschritte der Akustik - DAGA 2023
Status:Published
Keywords:aeroacoustic wind tunnel, Helmholtz resonator, low-frequency pressure fluctuations, edgetone, standing wave, airfoil, blunt trailing edge
Event Title:Fortschritte der Akustik - DAGA 2023
Event Location:Hamburg, Deutschland
Event Type:national Conference
Event Start Date:6 March 2023
Event End Date:9 March 2023
Organizer:Deutsche Gesellschaft für Akustik e.V. (DEGA)
HGF - Research field:Energy
HGF - Program:other
HGF - Program Themes:E - no assignment
DLR - Research area:Energy
DLR - Program:E - no assignment
DLR - Research theme (Project):E - no assignment
Location: Dresden
Institutes and Institutions:Institute of Software Methods for Product Virtualization > Enabling Software Technologies
Deposited By: Stahl, Kathrin
Deposited On:05 Jun 2023 14:34
Last Modified:24 Apr 2024 20:55

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Website and database design: Copyright © German Aerospace Center (DLR). All rights reserved.