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Acoustic Influence on the Active Control of 3D Disturbances in a 2D Boundary Layer

[+] Author Affiliations
Holger Opfer, Dirk Ronneberger

Georg-August University Göttingen, Göttingen, Germany

Friedrich-Reinhard Grosche

German Aerospace Center DLR, Göttingen, Germany

Paper No. FEDSM2002-31042, pp. 1345-1350; 6 pages
doi:10.1115/FEDSM2002-31042
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

An active wave-cancellation system is designed to cancel 2D- and 3D-disturbances in a 2D-boundary layer taking into account the angle dependency of the dispersion relation of the Tollmien-Schlichting instability waves. Requirements to such a system are specified. The system is tested by exposure to both, ‘naturally’ occurring disturbances and artificially introduced point source disturbances. Up to 22 dB reduction of the ‘naturally’ occurring disturbances is obtained, but only minor additional improvement is achieved when the angle dependence of the dispersion is considered in the control system. On the other hand the range of the controllable lateral wavenumbers has been enlarged by these additional efforts as demonstrated with the point source disturbances. The performance of the system is limited by different acoustic effects due to the detection and generation of acoustic velocity and pressure fluctuations by the system.

Copyright © 2002 by ASME

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