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Measurements of sound-flow interaction at a bias flow liner

Haufe, Daniel and Schulz, Anita and Bake, Friedrich and Enghardt, Lars and Czarske, Jürgen and Fischer, Andreas (2014) Measurements of sound-flow interaction at a bias flow liner. In: 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics. 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 07.-10.07.2014, Lissabon, Portugal.

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Official URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/finalworks2014/papers/02.3_1_41paper.pdf

Abstract

In order to optimize the noise reduction of perforated liners with bias flow that are applied in jet engines and gas turbines, a better understanding of the inherent aeroacoustic sound damping mechanisms is necessary. For that purpose, the interaction between sound and flow that is responsible for the damping process needs to be localized, analyzed and balanced. To this aim, laser optical measurements are needed that both acquire the complex sound field and flow field contactlessly. Acoustic particle image velocimetry (A-PIV) and Doppler global velocimetry with sinusoidal frequency modulation (FM-DGV) are applied for this measurement task in comparison. The results show that both methods are advantageous due to their ability for multipoint measurement. In particular, A-PIV offers a wide overview of multiple perforation orifices, whereas FM-DGV satisfies with a high measurement rate of up to 100 kHz allowing the spectral analysis of the velocity field. Both methods were applied at a generic bias flow liner, showing acoustically induced flow velocity oscillations near the rim of the perforation orifices. The spatially resolved oscillation magnitude shows a correlation to the dissipation coefficient and indicates an acoustically induced flow vortex generation and collapse in the vicinity of the liner perforation, respectively, which depends on the relative position to the orifice. As shown in this paper, the measurement methods have the potential to enhance current knowledge about the aeroacoustic interaction at liners, especially in the scenario with both grazing and bias flow. In order to fully understand these interaction phenomena an expansion to volumetric measurements is needed in the future.

Item URL in elib:https://elib.dlr.de/89648/
Document Type:Conference or Workshop Item (Speech)
Title:Measurements of sound-flow interaction at a bias flow liner
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haufe, DanielInstitut 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, LarsAT-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:July 2014
Journal or Publication Title:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:bias flow liner, damping, laser optical measurement techniques, acoustic particle velocity, grazing flow
Event Title:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Event Location:Lissabon, Portugal
Event Type:international Conference
Event Dates:07.-10.07.2014
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 - Turbine Technologies
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Bake, Dr.-Ing. Friedrich
Deposited On:04 Aug 2014 09:07
Last Modified:31 Jul 2019 19:46

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