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Blade Wake Interaction Noise for a BO-105 Model Main Rotor

Burley, C.L. and Brooks, T.F. and Splettstößer, W.R. and Schultz, K.-J. and Kube, R, and Buchholz, H. and Wagner, W. and Weitemeier, W. (1997) Blade Wake Interaction Noise for a BO-105 Model Main Rotor. AHS Technical Specialists' Meeting for Rotorcraft Acoustics and Aerodynamics, Williamsburg, VA, USA, 28.-30.10.97.

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Abstract

Fundamental characteristics of Blade Wake Interaction (BWI) noise are determinated, and a prediction method is developed, using acoustic and blade pressure data from a 4-bladed BO-105 model helicopter main rotor. BWI is a broadband noise source caused by the blade interactions with turbulence in the rotor wake, particularly about the tip vortices. The data are from the rotor aeroacoustic test program called HART which was jointly conducted by European and American government agencies in the German-Dutch Wind Tunnel, DNW. The test datainclude simultaneous measurements of instantaneous blade pressures and acoustic time histories as well as averaged data. The statistical character of the BWI is determined from the instantaneous surface pressures. A BWI noise metric is developed and BWI noise directivity contours (similar to those typically presented for BVI noise) are presented and shown to be a function of rotor tip-path-plane angle. Similarly, BWI.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1997,
Title:Blade Wake Interaction Noise for a BO-105 Model Main Rotor
Authors:
AuthorsInstitution or Email of Authors
Burley, C.L.NASA Langley Research Center, Hampton, Virginia, USA
Brooks, T.F.NASA Langley Research Center, Hampton, Virginia, USA
Splettstößer, W.R.UNSPECIFIED
Schultz, K.-J.UNSPECIFIED
Kube, R, Institut für Flugmechanik
Buchholz, H.UNSPECIFIED
Wagner, W.Institut für Aeroelastik
Weitemeier, W.Institut für Aeroelastik
Date:1997
Status:Published
Keywords:Helicopter noise, rotor broadband noise, blade-wake interaction (BVI) noise
Event Title:AHS Technical Specialists' Meeting for Rotorcraft Acoustics and Aerodynamics, Williamsburg, VA, USA, 28.-30.10.97
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:Aeronautics
DLR - Program:L DT - Drehflüglertechnologien
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
Institute of Flight Systems > Institut für Flugmechanik
Institute of Aeroelasticity
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:06

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