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Investigations of Aeroacoustics of High Speed Trains in Wind Tunnels by Means of Phased Microphone Array Technique

Lauterbach, Andreas and Ehrenfried, Klaus and Loose, Sigfried (2015) Investigations of Aeroacoustics of High Speed Trains in Wind Tunnels by Means of Phased Microphone Array Technique. In: The Aerodynamics of Heavy Vehicles III: Trucks, Buses, and Trains Lecture Notes in Applied and Computational Mechanics, 79 (1). Springer International Publishing. pp. 175-192. ISBN 978-3-319-20121-4. ISSN 1613-7736

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Official URL: http://www.springer.com/de/book/9783319201214

Abstract

The present study focuses on the analysis of the main aeroacoustic sound sources of a high speed train, measured in a wind tunnel. The experiments using a 1:25 Inter City Express 3 model were carried out in two different wind tunnels: The Aeroacoustic Wind tunnel (AWB) of the German Aerospace Center (DLR) in Brunswick and in the Cryogenic wind tunnel (DNW-KKK) of the DNW (German – Dutch wind tunnels) in Cologne. The AWB is a Goettingen type wind tunnel with open test section which is surrounded by an anechoic chamber. The advantage of this facility is its low background noise level and its nearly anechoic test section. The maximum Reynolds number, based on the wind speed and the width of the train, achieved is 0.46 million. In order to obtain higher Reynolds numbers a second measurement campaign has been conducted in the cryogenic wind tunnel, using another array for cryogenic in-flow applications. The DNW-KKK enables higher Reynolds numbers up to 3.7 million by cooling down the fluid to 100 Kelvin. The DNW-KKK has a closed test section and the microphone array is mounted on a side wall inside the wind tunnel, and therefore the measurements are affected by the turbulent boundary layer. Drawback of this facility is that it is not optimized for aeroacoustic experiments and reflexions as well as the high background noise level can disturb the results. Differences of the two different experimental setups on the results and primarily, influence of the Reynolds number on the aeroacoustic of a high speed train will be discussed.

Item URL in elib:https://elib.dlr.de/66126/
Document Type:Contribution to a Collection
Additional Information:Proceedings of "The Aerodynamics of Heavy Vehicles III: Trucks, Buses and Trains", held September, 2010 in Potsdam, Germany, eBook ISBN: 978-3-319-20122-1
Title:Investigations of Aeroacoustics of High Speed Trains in Wind Tunnels by Means of Phased Microphone Array Technique
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
Date:2015
Journal or Publication Title:The Aerodynamics of Heavy Vehicles III: Trucks, Buses, and Trains
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:79
DOI :10.1007/978-3-319-20122-1_11
Page Range:pp. 175-192
Publisher:Springer International Publishing
Series Name:Lecture Notes in Applied and Computational Mechanics
ISSN:1613-7736
ISBN:978-3-319-20121-4
Status:Published
Keywords:Aeroacoustic, noise, High speed trains, Pantograph, Cavity, Microphone phased array, Beamforming, Wind tunnel
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 III (old)
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Fluid Systems
Deposited By: Micknaus, Ilka
Deposited On:23 Nov 2015 15:19
Last Modified:23 May 2016 22:54

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