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Aeroacoustic near-field measurement with micrometer resolution

Haufe, Daniel and Pietzonka, Sebastian and Fischer, Andreas and Schulz, Anita and Bake, Friedrich and Lars, Enghardt and Czarske, Jürgen (2014) Aeroacoustic near-field measurement with micrometer resolution. In: 22. GALA-Fachtagung Lasermethoden in der Strömungsmechanik. 22. GALA-Fachtagung Lasermethoden in der Strömungsmechanik, 09.-11.09.2013, Karlsruhe, Germany.

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Abstract

For the investigation of sound-flow interaction in near-fields, like aeroacoustic damping or acoustic streaming, measurements of the acoustic particle velocity (APV) and the flow velocity field with a micrometer resolution are required. In addition, a high working distance is needed for contactless measurement. For this task, the laser Doppler velocity profile sensor is shown to be a predestined tool. First, the APV measurement is successfully validated in an aeroacoustic duct using a microphone-based measurement method as a reference. Here, a minimum APV amplitude of 4 mm/s was resolved in agreement with the reference measurements. Then, the profile sensor was applied for measurements at a perforated acoustic liner with bias flow. Acoustically induced flow vortex structures were resolved with a spatial resolution of 10μm with a minimum distance of 350μm to the liner perforation. A comparison to frequency modulated Doppler global velocimetry (FM-DGV) demonstrated the advantage of the profile sensor for spatially resolved measurements of small scale structures. In contrast, FM-DGV is beneficial due to its high measurement rate which enables the spectral analysis of the velocity in order to better understand the energy transfer from sound to flow.

Item URL in elib:https://elib.dlr.de/94317/
Document Type:Conference or Workshop Item (Speech)
Title:Aeroacoustic near-field measurement with micrometer resolution
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haufe, DanielInstitut für Grundlagen der Elektrotechnik und Elektronik, Professur für Mess- und Prüftechnik, TU DresdenUNSPECIFIED
Pietzonka, SebastianInstitut für Grundlagen der Elektrotechnik und Elektronik, Professur für Mess- und Prüftechnik, TU DresdenUNSPECIFIED
Fischer, AndreasInstitut für Grundlagen der Elektrotechnik und Elektronik, Professur für Mess- und Prüftechnik, TU DresdenUNSPECIFIED
Schulz, AnitaInstitut für Strömungsmechanik und Technische AkustikTU BerlinUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
Lars, EnghardtDLR, AT-TRAUNSPECIFIED
Czarske, JürgenInstitut für Grundlagen der Elektrotechnik und Elektronik, Professur für Mess- und Prüftechnik, TU DresdenUNSPECIFIED
Date:September 2014
Journal or Publication Title:22. GALA-Fachtagung Lasermethoden in der Strömungsmechanik
Refereed publication:No
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Laser-Doppler-Profilsensor, Schallschnelle, perforierte Schalldämpfer mit Durchströmung laser Doppler profile sensor, acoustic particle velocity, bias flow liner
Event Title:22. GALA-Fachtagung Lasermethoden in der Strömungsmechanik
Event Location:Karlsruhe, Germany
Event Type:national Conference
Event Dates:09.-11.09.2013
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combustion Chamber Technologies (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:15 Jan 2015 13:48
Last Modified:15 Jan 2015 13:48

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