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Measurement of the acoustic particle velocity under grazing flow using A-PIV

Schulz, Anita and Fischer, André and Bake, Friedrich (2014) Measurement of the acoustic particle velocity under grazing flow using A-PIV. 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/02.7_3_269paper.pdf

Abstract

For many aero-acoustic research applications the direct measurement of the acoustic particle velocity is of high relevance. Often times these applications exhibit a mean flow field superimposed by the acoustics wave propagation. This work demonstrates the application of the non-intrusive, laser-based Acoustic Particle Image Velocimetry (A-PIV) in duct flows with Mach numbers up to 0.2. In a first step the particular features of an acoustic field with non-uniform mean flow are discussed briefly. The experiments were conducted in the acoustic grazing flow facility DUCT-R at DLR Berlin. When mean flow is present, the A-PIV results show a strongly profiled distribution of the acoustic particle velocity in duct-height direction (y). Hence, a difficulty occurs in determining a representative value of the acoustic particle velocity for comparison with microphone measurements, since the applied microphone pressure analysis neglects the y-dependency (plug flow assumption). However, averaging of the acoustic particle velocities along the half duct height reveals a very close agreement with the microphone data. Along the lines of previous work under no-flow conditions [1], the acoustic plane wave decomposition was applied to the A-PIV results. The resulting amplitudes of the up- and downstream propagating waves match very well with the microphone-based data. In results, the ability of A-PIV to determine the acoustic particle velocity under mean flow conditions could be proven. Interestingly, with the A-PIV measurement and post-processing procedure much higher Dynamic Velocity Range (DVR) values could be reached than expected for the applied PIV systems following previous literature.

Item URL in elib:https://elib.dlr.de/89647/
Document Type:Conference or Workshop Item (Speech)
Title:Measurement of the acoustic particle velocity under grazing flow using A-PIV
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schulz, AnitaInstitut für Strömungsmechanik und Technische Akustik, TU BerlinUNSPECIFIED
Fischer, Andréandre.fischer (at) dlr.deUNSPECIFIED
Bake, FriedrichDLR, AT-TRAUNSPECIFIED
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:A-PIV, 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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