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Microphone array wind tunnel measurements of Reynolds number effects of high-speed train aeroacoustics

Lauterbach, Andreas and Ehrenfried, Klaus and Loose, Sigfried and Wagner , Claus (2012) Microphone array wind tunnel measurements of Reynolds number effects of high-speed train aeroacoustics. International Journal of Aeroacoustics, 11 (3 - 4), pp. 411-446. Sage Publications. DOI: 10.1260/1475-472X.11.3-4.411 ISSN 1475-472X

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Official URL: http://multi-science.metapress.com/content/n2832813771l/?p=701742fec55b46d7adc197b309ff273e&pi=0

Abstract

The present study focuses on the Reynolds number dependence of high-speed train aeroacoustic sound sources. To cover a wide range of Reynolds numbers the experimental investigations are carried out on a 1:25 scaled model of the high speed train Inter City Express 3 by conducting microphone array measurements in two wind tunnels. The latter are the Aeroacoustic Wind tunnel (AWB) of the German Aerospace Center (DLR) in Brunswick, providing nearly perfect acoustical conditions, and the Cryogenic wind tunnel (DNW-KKK) of the DNW (German - Dutch wind tunnels) in Cologne, allowing measurements at higher Reynolds numbers. Two types of sound sources with different characteristics at Reynolds numbers of up to Re = 0.46 mio have been identified by measurements in the AWB. It was found, that the aeroacoustic noise from the bogie section is dominant for frequencies f < 5 kHz and can be characterized by cavity mode excitation. Further, the pantograph is the dominant sound source above f = 5 kHz with a Aeolian tone characteristic. Additional aeroacoustic measurements have been conducted in the cryogenic wind tunnel DNW-KKK in order to analyse the Reynolds number dependence of the the noise generated at the first bogie, for higher Reynolds numbers of up to Re = 3.70 mio. The DNW-KKK admits to vary the Mach and Reynolds numbers independently. These measurements reveal only a weak Reynolds number dependence of the noise source generated at the first bogie.

Item URL in elib:https://elib.dlr.de/70716/
Document Type:Article
Additional Information:Submitted: Aug 19, 2011; Revised: Mar 31, 2012; Accepted: April 16, 2012; Aerospace Science and Acoustics
Title:Microphone array wind tunnel measurements of Reynolds number effects of high-speed train aeroacoustics
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lauterbach, Andreasandreas.lauterbach (at) dlr.deUNSPECIFIED
Ehrenfried, Klausklaus.ehrenfried (at) dlr.deUNSPECIFIED
Loose, Sigfriedsigfried.loose (at) dlr.deUNSPECIFIED
Wagner , Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:2012
Journal or Publication Title:International Journal of Aeroacoustics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.1260/1475-472X.11.3-4.411
Page Range:pp. 411-446
Publisher:Sage Publications
ISSN:1475-472X
Status:Published
Keywords:Aeroacoustic, scaling, high-speed train, noise reduction, Reynolds number, Strouhal number, Helmholtz number, cavity, cryogenic wind tunnel, microphone array, beamforming
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Lauterbach, Andreas
Deposited On:20 Jul 2012 08:46
Last Modified:06 Sep 2019 15:18

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