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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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|
|Date:||12 September 2006|
|Journal or Publication Title:||European Rotorcraft Forum|
|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|
|HGF - Program:||Aeronautics|
|HGF - Program Themes:||L RR - Rotorcraft Research|
|DLR - Research area:||Aeronautics|
|DLR - Program:||L RR - Rotorcraft Research|
|DLR - Research theme (Project):||L - The Quiet and Comfortable Rotorcraft|
|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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