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.
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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/ | ||||||||||||||||||||
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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: |
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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 |
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