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The Noise of Counter Rotating Propfans: Initial Results of a Wind Tunnel Model Study.

Gehlhar, B. and Dobrzynski, W. (1990) The Noise of Counter Rotating Propfans: Initial Results of a Wind Tunnel Model Study. In: Proceedings of the European Propulsion Forum. European Propulsion Forum, 3-5 April 1990, Cologne.

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Abstract

The advent of counter rotating propfans promises significant fuel savings for commercial aircraft. These engines exhibit, however, noise characteristics which are quite different from those of conventional ones. This is primarily a consequence of additional noise sources related to instationary aerodynamic interactions between both rotors.To further the understanding of the physical mechanisms involved, the noise characteristics of counter rotating model-scale propellers were investigated within an aeroacoustic wind tunnel study and the results evaluated against simplified aeroacoustic calculations. The results of the study indicate that unsteady wake/rotor-interaction related harmonic components predominantly contribute to the noise at high frequencies, while acoustic interference effects determine the shape of noise spectra at low frequencies.

Document Type:Conference or Workshop Item (Paper)
Additional Information: institution=DGLR, LIDO-Berichtsjahr=1990, pages=9,
Title:The Noise of Counter Rotating Propfans: Initial Results of a Wind Tunnel Model Study.
Authors:
AuthorsInstitution or Email of Authors
Gehlhar, B.UNSPECIFIED
Dobrzynski, W.UNSPECIFIED
Date:1990
Journal or Publication Title:Proceedings of the European Propulsion Forum
Status:Published
Keywords:Propeller Noise, Propfan Noise
Event Title:European Propulsion Forum, 3-5 April 1990, Cologne
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - Turbine Technologies
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:04

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