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Aeroacoustic near-field measurements with microscale resolution

Haufe, Daniel and Pietzonka, Sebastian and Schulz, Anita and Bake, Friedrich and Enghardt, Lars and Czarske, Jürgen and Fischer, Andreas (2014) Aeroacoustic near-field measurements with microscale resolution. Measurement Science & Technology, 25. Institute of Physics (IOP) Publishing. DOI: doi:10.1088/0957-0233/25/10/105301 ISSN 0957-0233

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Abstract

In order to analyse aeroacoustic phenomena at near-fields, e.g. the sound–flow interaction at aircraft engine liners, measurements of the flow velocity and the acoustic particle velocity (APV) with microscale resolution are required. To this end, the APV measurement with a high spatial resolution of 10 μm was conducted by means of a laser Doppler velocity profile sensor. For validation of the APV measurements using the profile sensor in a superposed flow, a good agreement with indirect microphone measurements as a reference was achieved, up to a maximum Mach number of 0.25. Aeroacoustic measurements at a minimum distance of 350 μm to the perforation of a bias flow liner were performed using the profile sensor. As a result, acoustically induced velocity oscillations near the rim of the orifice were detected with microscale resolution. The phase-resolved oscillation field indicates vortex shedding from the perforation, which is initiated by the sound–flow interaction. Thus, it is demonstrated that the profile sensor is a valuable tool for analysing aeroacoustic phenomena at near-fields, down to the Kolmogorov scale.

Item URL in elib:https://elib.dlr.de/93357/
Document Type:Article
Title:Aeroacoustic near-field measurements with microscale 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
Schulz, AnitaInstitut für Strömungsmechanik und Technische Akustik, TU BerlinUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
Enghardt, LarsDLR, AT-TRAUNSPECIFIED
Czarske, JürgenInstitut 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
Date:August 2014
Journal or Publication Title:Measurement Science & Technology
Refereed publication:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:25
DOI :doi:10.1088/0957-0233/25/10/105301
Publisher:Institute of Physics (IOP) Publishing
ISSN:0957-0233
Status:Published
Keywords:aeroacoustics, microscale measurement, bias flow liner, laser Doppler velocity profile sensor
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Combusion Chamber Technologies (old), L - Turbine Technologies
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:17 Dec 2014 12:29
Last Modified:08 Mar 2018 18:18

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