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Ten Years of Cooperative Helicopter Aeroacoustics Research in the DNW.

Heller, H. and Splettstößer, W. and Schultz, K.-J. and Martin, R. (1) and Brooks, T. (1) and Marcolini, M. (1) and Schmitz, F. (2) and Boxwell, D. (2) (1990) Ten Years of Cooperative Helicopter Aeroacoustics Research in the DNW. In: Proceedings of the "Colloquium at the Occasion of Ten Years Operation al Phase of DNW" (October 1990). "Colloquium at the Occasion of Ten Years Operational Phase of DNW" (October 1990)..

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Abstract

Both the main rotor and the tail rotor of a helicopter generate noise as individual sources. They also interact aerodynamically, causing "interaction noise". Since there is no uniform inflow into the rotor, an individual rotor blade is subjected to widely differing flow conditions. To make the helicopter an environmentally acceptable aircraft, it must be quiet. It is, therfore, the task of the scientist and the research engineer to further the understanding of the mechanisms of noise generation of helicopter rotor, to develop means of controlling these mechanisms towards less noise generation, and to provide the helicopter manufacturer and the operator with guidance on how to build and fly an acoustically "non-intrusive" aircraft. The German Dutch Wind Tunnel (DNW) meets most of these stringent qualifications for conducting high quality aeroacoustic rotor system tests. In this paper some of the more outstanding research projects that were conducted in the DNW by the staffs of the DLR, of the NASA-Langley Research Center and of the US-Army, frequently cooperative and within the framework of "Memoranda of Understanding" or of "Letters of Agreement" are discussed.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1990,
Title:Ten Years of Cooperative Helicopter Aeroacoustics Research in the DNW.
Authors:
AuthorsInstitution or Email of Authors
Heller, H.UNSPECIFIED
Splettstößer, W.UNSPECIFIED
Schultz, K.-J.UNSPECIFIED
Martin, R. (1)UNSPECIFIED
Brooks, T. (1)UNSPECIFIED
Marcolini, M. (1)UNSPECIFIED
Schmitz, F. (2)UNSPECIFIED
Boxwell, D. (2)UNSPECIFIED
Date:1990
Journal or Publication Title:Proceedings of the "Colloquium at the Occasion of Ten Years Operation al Phase of DNW" (October 1990)
Status:Published
Keywords:Helicopter Noise, Rotor Noise, High-Speed Impulsive Noise, Wind Tunne l Testing
Event Title:"Colloquium at the Occasion of Ten Years Operational Phase of DNW" (October 1990).
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - The Quiet and Comfortable Rotorcraft
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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