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Acoustic wind tunnel tests on helicopter tail rotor noise (HeliNOVI)

Yin, Jianping and van der Wall, Berend G. and Oerlemans, Stefan (2008) Acoustic wind tunnel tests on helicopter tail rotor noise (HeliNOVI). Journal of the American Helicopter Society, 53 (3), pp. 226-239. ISSN 0002-8711.

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In the framework of the European HeliNOVI project, an acoustic DNW wind tunnel study was conducted with respect to helicopter tail rotor noise. The goal of the tests was to investigate (1) the importance of tail rotor noise for different flight conditions, (2) main rotor-tail rotor interaction noise, and (3) tail rotor noise reduction concepts. Besides the conventional measurement techniques (such as an inflow microphone traverse, blade pressure transducers and particle image velocimetry), an out-of-flow phased microphone array was applied to locate and quantify the different helicopter noise sources. The test results indicate that tail rotor noise is most important for climb and high-speed level flight. Furthermore, it is found that main rotor-tail rotor interactions only have a small effect on the overall noise levels. Aside from a reduction of rotor tip speed, the most efficient tail rotor noise reduction concept involves changing the tail rotor direction of rotation from "advancing side down" to "advancing side up".

Document Type:Article
Title:Acoustic wind tunnel tests on helicopter tail rotor noise (HeliNOVI)
AuthorsInstitution or Email of Authors
van der Wall, Berend G.UNSPECIFIED
Oerlemans, StefanUNSPECIFIED
Date:July 2008
Journal or Publication Title:Journal of the American Helicopter Society
Refereed publication:Yes
In ISI Web of Science:Yes
Page Range:pp. 226-239
Keywords:Helicopter Tail Rotor Noise, Tail Rotor Noise Reduction, Main/Tail Rotor Interaction, PIV
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Quiet and Comfortable Rotorcraft
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology
Deposited By: Dr.-Ing. Jianping Yin
Deposited On:29 Jan 2009
Last Modified:27 Apr 2009 15:14

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