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Acoustic measurements of a contra-rotating open rotor in an open jet wind-tunnel

Funke, St. and Kim, L. and Siller, H. (2012) Acoustic measurements of a contra-rotating open rotor in an open jet wind-tunnel. International Journal of Aeroacoustics, Vol 11 (Nr. 2 - 2012), pp. 197-212. Sage Publications. doi: 10.1260/1475-472X.11.2.197.

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Official URL: http://www.multi-science.co.uk


Acoustic measurements of a scaled model of a contra-rotating engine were performed in an open wind tunnel facility. The motivation for the work presented here was to analyse the possibilities for quantitative acoustic measurements in an environement that was not designed for acoustic measurements and where reverberations, shear layer refraction and turbulence distort the sound field. Extensive acoustic measurements were performed using a linear microphone array with 104 microphones on the floor of the hall. Room acoustics effects were investigated with a reference sound source and the sound field of the rotors was measured for different configurations. The results show that reflections fron the ceiling and side walls interfere with the direct sound field and influence the measure directivity due to strong local variations of the sound pressure level from one microphone position to the next. General trends and differences between the configurations can be shown from spatially averaged frequency spectra.

Item URL in elib:https://elib.dlr.de/79904/
Document Type:Article
Title:Acoustic measurements of a contra-rotating open rotor in an open jet wind-tunnel
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:International Journal of Aeroacoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Volume:Vol 11
Page Range:pp. 197-212
Publisher:Sage Publications
Keywords:Acoustic measurements, contra-rotating open rotor, open jet wind-tunnel, linear microphone
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Fan and Compressor Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Acoustic
Deposited By: Kaur, Balbir
Deposited On:10 Jan 2013 11:08
Last Modified:08 Nov 2023 08:06

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