elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Investigation of Sound Generation and Transmission Effects Through the ACAT1 Fan Stage using Compressed Sensing-based Mode Analysis

Behn, Maximilian and Tapken, Ulf (2019) Investigation of Sound Generation and Transmission Effects Through the ACAT1 Fan Stage using Compressed Sensing-based Mode Analysis. 25th AIAA/CEAS Aeracoustics Conference, 20.-23. Mai 2019, Delft, Niederlande. DOI: 10.2514/6.2019-2502

[img] PDF
6MB

Official URL: https://arc.aiaa.org/doi/10.2514/6.2019-2502

Abstract

In an extensive measurement campaign at the UFFA test rig of AneCom AeroTest in Wildau, Germany, the sound field generated from the ACAT1 fan stage was measured by several dynamic pressure sensor arrays of different geometrical arrangements at the inlet, interstage and bypass section. The sparse ring arrays with irregular and optimised geometries are utilised in combination with the Compressed Sensing-based mode analysis in order to investigate the tonal and broadband sound generation and transmission with high resolution. From the azimuthal mode spectra, the relation between the cut-on mode range at the sources and the dominant modes at the measurement sections is observed and used to determine the contribution of different sound generation mechanisms. With the help of interstage mode analyses strong rotor-coherent contributions due to rotor wake irregularities are identified and the rotor-shielding effect is assessed. The dependencies of the broadband mode spectra with respect to the operation points and working lines are shown and the contribution of stator and rotor bound sources is investigated. Results indicate that mode scattering at the stator vane row has a significant influence on the downstream radiated sound field. Evidence is further found for the occurrence of the acoustic tunnel effect, where cut-off modes excited at the stator leading edge become cut-on during the propagation through the inter-vane channels. This effect triggers mode scattering towards rotor counter-rotating modes and increases the sound radiation from fan stages.

Item URL in elib:https://elib.dlr.de/133466/
Document Type:Conference or Workshop Item (Speech)
Title:Investigation of Sound Generation and Transmission Effects Through the ACAT1 Fan Stage using Compressed Sensing-based Mode Analysis
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Behn, MaximilianMaximilian.Behn (at) dlr.dehttps://orcid.org/0000-0001-8478-8269
Tapken, UlfUlf.Tapken (at) dlr.deUNSPECIFIED
Date:May 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
DOI :10.2514/6.2019-2502
Status:Published
Keywords:Mode Analysis, Compressed Sensing, sparse ring arrays, fan noise
Event Title:25th AIAA/CEAS Aeracoustics Conference
Event Location:Delft, Niederlande
Event Type:international Conference
Event Dates:20.-23. Mai 2019
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 - Fan and Compressor Technologies
Location: Berlin-Charlottenburg
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Behn, Maximilian
Deposited On:14 Jan 2020 12:21
Last Modified:14 Jan 2020 12:21

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.