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Analysis of Tail Rotor noise reduction benefits using HELINOVI aeroacoustic main/tail rotor test and posttest prediction results

Yin, Jianping and Dummel, Andreas and Falchero, Daniele and Pidd, Mike and Prospathopoulos, John and Visingardi, Antonio and Voutsinas, Spyros G (2006) Analysis of Tail Rotor noise reduction benefits using HELINOVI aeroacoustic main/tail rotor test and posttest prediction results. In: European Rotorcraft Forum. 32st ERF 2005, AC05, 2006-12-09 - 2006-14-09, Maastricht (NL).

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Abstract

The EU HeliNOVI project was designed to improve the understanding of Tail Rotor (TR) noise reduction and vibration reduction technology by means of a comprehensive investigation of Main Rotor (MR)/TR interaction noise and rotor induced vibrations through both theory and experiment. Several tail rotor noise reduction techniques were investigated both through wind tunnel testing and through simulations. The investigation included tip speed reduction, the sense of TR rotational direction and different TR rotor position. Both the test and simulation results indicate that tail rotor noise is most important for climb and high-speed level flight. The analysis of the tail rotor noise reduction benefits from test and simulation results show that besides a reduction of rotor tip speed, the most efficient tail rotor noise reduction concept consists in changing the tail rotor sense of rotation from 'Advancing Side Down-ASD' to 'Advancing Side Up-ASU'. In addition, the noise reduction for new TR posi-tion is mainly due to increasing the advancing blade distance rather than changing TR aero-dynamic behavior.

Document Type:Conference or Workshop Item (Speech)
Title: Analysis of Tail Rotor noise reduction benefits using HELINOVI aeroacoustic main/tail rotor test and posttest prediction results
Authors:
AuthorsInstitution or Email of Authors
Yin, JianpingUNSPECIFIED
Dummel, AndreasEurocopter Deutschland (ECD), Germany
Falchero, DanieleEurocopter SAS (EC), France
Pidd, MikeQinetiQ Ltd, United Kingdom
Prospathopoulos, JohnNational Technical University of Athens (NTUA), Greece
Visingardi, AntonioCentro Italiano di Richerche Aerospaziali (CIRA), Italy
Voutsinas, Spyros GNational Technical University of Athens (NTUA), Greece
Date:12 September 2006
Journal or Publication Title:European Rotorcraft Forum
Status:Published
Keywords:Helicopter tail rotor noise reduction, Main/Tail Rotor Interaction, HELINOVI Aeroacoustic Test, Numerical Simulation
Event Title:32st ERF 2005, AC05
Event Location:Maastricht (NL)
Event Type:international Conference
Event Dates:2006-12-09 - 2006-14-09
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:02 Jan 2007
Last Modified:27 Apr 2009 13:22

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