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REPRESENTATIVE TEST RESULTS FROM HELINOVI AEROACOUSTIC MAIN ROTOR/TAIL ROTOR/FUSELAGE TEST IN DNW

Yin, Jianping and van der Wall, Berend G. and Oerlemans, Stefan (2005) REPRESENTATIVE TEST RESULTS FROM HELINOVI AEROACOUSTIC MAIN ROTOR/TAIL ROTOR/FUSELAGE TEST IN DNW. In: European Rotorcraft Forum. 31st ERF 2005, P42, 2005-13-09 - 2005-15-09, Florence (ITALY).

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Abstract

In the framework of the European HeliNOVI project, an acoustic DNW wind tunnel study was conducted into 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 PIV, 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. After a reduction of rotor tip speed, the most efficient tail rotor noise reduction concept involves changing the tail rotor sense of rotation from 'advancing side down' to 'advancing side up'

Item URL in elib:https://elib.dlr.de/19887/
Document Type:Conference or Workshop Item (Paper)
Title:REPRESENTATIVE TEST RESULTS FROM HELINOVI AEROACOUSTIC MAIN ROTOR/TAIL ROTOR/FUSELAGE TEST IN DNW
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Yin, JianpingUNSPECIFIEDUNSPECIFIED
van der Wall, Berend G.UNSPECIFIEDUNSPECIFIED
Oerlemans, StefanNational Aerospace Laboratory NLR, The NetherlandsUNSPECIFIED
Date:September 2005
Journal or Publication Title:European Rotorcraft Forum
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:HeliNOVI , Helicopter Noise and vibration reduction, AEROACOUSTIC MAIN ROTOR/TAIL ROTOR/FUSELAGE ,Tail Rotor NOISE reduction, PIV, Acoustic, Blade pressure
Event Title:31st ERF 2005, P42
Event Location:Florence (ITALY)
Event Type:international Conference
Event Dates:2005-13-09 - 2005-15-09
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Rotorcraft (old)
DLR - Research area:Aeronautics
DLR - Program:L RR - Rotorcraft Research
DLR - Research theme (Project):L - The Quiet and Comfortable Rotorcraft (old)
Location: Braunschweig
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Technical Acoustics
Deposited By: Yin, Dr.-Ing. Jianping
Deposited On:01 Dec 2005
Last Modified:27 Apr 2009 04:44

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