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, Vol. 11 (3 + 4), pp. 411-446. MULTI-SCIENCE PUBLISHING CO. LTD.. DOI: 10.1260/1475-472X.11.3-4.411. ISSN 1475-472X (Print).
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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.
|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|
|Journal or Publication Title:||International Journal of Aeroacoustics|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 411-446|
|Publisher:||MULTI-SCIENCE PUBLISHING CO. LTD.|
|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:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research area:||Transport|
|DLR - Program:||V BF - Bodengebundene Fahrzeuge|
|DLR - Research theme (Project):||V - Next Generation Train|
|Institutes and Institutions:||Institute of Aerodynamics and Flow Technology > Fluid Systems|
|Deposited By:||Andreas Lauterbach|
|Deposited On:||20 Jul 2012 08:46|
|Last Modified:||04 Apr 2013 16:30|
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