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Mechanisms of Transonic Blade-Vortex Interaction Noise

Lent, H.-M. and Meier, G.E.A. and Müller, K.J. and Obermeier, F. (1993) Mechanisms of Transonic Blade-Vortex Interaction Noise. Journal of Aircraft, Vol. 30 (No. 1), pp. 88-93.

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Experimental investigations of aerodynamic sound generation due to vortex-airfoil interaction in two-dimensional transonic flow were performed using two different experimental set-up a vacuum-operated transonic wind tunnel and a shock tube. Flow visualization was accomplished by a Mach-Zehnder interferometer as well as by a holographic interferometer. The interferograms obtained were evaluated by an image processing system. In addition, pressure measurements were carried out in the shock tube which allows for a correlation of time-dependent pressure distributions and the density distributions evaluated from the interferograms. Two mechanism of aerodynamic sound generation are identified. These are different from the dipole-like mechanism known for subsonic flow fields. The newly found sound waves are called "transonic waves" and "compressibility waves". For both of them simple models have been suggested which can partly explain their occurrence and their strengths.

Document Type:Article
Additional Information: LIDO-Berichtsjahr=1993,
Title:Mechanisms of Transonic Blade-Vortex Interaction Noise
AuthorsInstitution or Email of Authors
Lent, H.-M.MPI für Strömungsforschung, Göttingen
Müller, K.J.MPI für Strömungsforschung
Obermeier, F.MPI für Strömungsforschung
Journal or Publication Title:Journal of Aircraft
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:Vol. 30
Page Range:pp. 88-93
Keywords:Transonic interaction, Vortices, Airfoils, Separation bubble, Interferometric flow isualization
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L DT - Drehflüglertechnologien
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:07

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