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Acoustic properties of aircraft wake vortices

Böhning, P. and Michel, U. and Baumann, R. (2008) Acoustic properties of aircraft wake vortices. DLR-Forschungsbericht. DLR-FB--2008-15. DLR.

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The noise generation by aircraft wake vortices has been studied numerically and experimentally. The numerical study revealed a relation between the circulation Γ, the vortex core size rc and the frequency fa of the peak level in the vortex noise spectra, fa ≈ Γ/(2π rc)2. The experimental data were obtained in measurements at airports applying phased microphone arrays. It has been revealed that sound sources are closely located to the vortex cores. The focused noise spectra of the wake vortices of all measured aircraft types are dominated by two maxima. The second maximum at f = 100 Hz is clearly caused by wake vortices. The origin of the first at 12 Hz has not been identified. Wake vortices were acoustically detected in 80 percent of the flyovers. Lowest detection rates were observed for the newer aircraft types Airbus 319, 320 and Boeing 737-800. A comparison of the wake trajectories obtained by phased microphone arrays and LIDAR revealed that the detection capability of the latter is superior.

Document Type:Monograph (DLR-Forschungsbericht)
Title:Acoustic properties of aircraft wake vortices
AuthorsInstitution or Email of Authors
Böhning, P.Rolls-Royce Deutschland Ltd & Co KG, Dahlewitz
Michel, U.DLR, Berlin
Page Range:pp. 53-72
Holzäpfel, Frank (Ed.)UNSPECIFIED
Gerz, Thomas (Prj. Mng.)UNSPECIFIED
Keywords:numerical study, vortex noise spectra
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Wake Vortices (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Atmospheric Trace Species
Deposited By: Jana Freund
Deposited On:23 Oct 2008
Last Modified:12 Dec 2013 20:33

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