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Airframe noise measurements in a large hard-walled closed-section wind tunnel

Di Marco, Alessandro and Burghignoli, Lorenzo and Centracchio, Francesco and Camussi, Roberto and Ahlefeldt, Thomas and Henning, Arne and Müller, Jürg (2019) Airframe noise measurements in a large hard-walled closed-section wind tunnel. Applied Acoustics, 146 (03), pp. 96-107. Elsevier. DOI: 10.1016/j.apacoust.2018.11.006 ISSN 0003-682X

Full text not available from this repository.

Official URL: https://doi.org/10.1016/j.apacoust.2018.11.006

Abstract

The airframe noise of a 1:2 scaled aircraft model is investigated through a series of experiments in the hard walled closed test section of a large non-anechoic wind tunnel. A surface mounted phased microphone array is used to acquire the wall pressure fluctuations generated by the interaction of the wind tunnel flow and the propagating noise. Data from two measurement campaigns are analysed. The wind tunnel acoustic behaviour and the array performance are first assessed evaluating the results obtained from a reference sound source installed in the centre of the test section. The combination of different airflow speeds, array positions and sound sources are tested. The airframe noise is evaluated acquiring pressure fluctuations in different configurations. The main parameters varied during the tests are the flight configuration, the speed of the airflow, the incidence angle of the model and the position of the microphone array. Data are processed and then analysed in the frequency domain and using a conventional beamforming algorithm to retrieve the sound source maps over the regions of interest. Source maps are deconvolved with a CLEAN-SC routine and single source contributions determined through integration of auto-powers. The resulting spectra are finally scaled determining the exponents of the pertinent scaling laws.

Item URL in elib:https://elib.dlr.de/126997/
Document Type:Article
Additional Information:Available online 17 November 2018, Paper DOI: 10.1016/j.apacoust.2018.11.006, March 2019
Title:Airframe noise measurements in a large hard-walled closed-section wind tunnel
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Di Marco, Alessandroalessandro.dimarco (at) uniroma3.ithttps://orcid.org/0000-0003-1818-6897
Burghignoli, Lorenzolorenzo.burghignoli (at) uniroma3.itUNSPECIFIED
Centracchio, Francescofrancesco.centracchio (at) uniroma3.itUNSPECIFIED
Camussi, Robertoroberto.camussi (at) uniroma3.itUNSPECIFIED
Ahlefeldt, Thomasthomas.ahlefeldt (at) dlr.dehttps://orcid.org/0000-0002-2869-2665
Henning, Arnearne.henning (at) dlr.dehttps://orcid.org/0000-0002-2806-8213
Müller, Jürgjuerg.mueller (at) aerodynamics.chUNSPECIFIED
Date:2019
Journal or Publication Title:Applied Acoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:146
DOI :10.1016/j.apacoust.2018.11.006
Page Range:pp. 96-107
Editors:
EditorsEmail
Li, K.M.UNSPECIFIED
Publisher:Elsevier
ISSN:0003-682X
Status:Published
Keywords:Aeroacoustics; Beamforming; UAV; Airframe Noise
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Micknaus, Ilka
Deposited On:10 Apr 2019 04:06
Last Modified:06 Sep 2019 15:17

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