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Aerodynamics and Aeroacoustics of Helicopter Main-Rotor/Tail-Rotor Interaction

Ahmed, S.R. and Yin, J. (1999) Aerodynamics and Aeroacoustics of Helicopter Main-Rotor/Tail-Rotor Interaction. 5th AIAA/CEAS Aeroacoustics Conference, Bellevue (usa), 10.-12.05.1999.

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Abstract

Preliminary results from an ongoing effort to model the interaction aerodynamics and aeroacoustics of main- and tail rotor of a helicopter in subsonic flow are presented. The configurations studied are a) a two-blade main- and tail rotor in hover, and b) a four-blade main- and a two-blade tail rotor in climb flight. The numerical approach consists of computing the unsteady pressure on the main- and tail rotor blade surface with a 3-D unsteady free wake panel method and using this as input to a Ffowcs Williams Hawkings equation based aeroacoustic code to evaluate the noise characteristics. Parameters varied for the hover configuration are the lateral spacing between the main- and tail rotor axis and the sense of tail rotor rotation. Main rotor interaction effects a significant change in the noise directivity pattern and noise level of the tail rotor. Tail rotor contribution to the total noise dominates during the climb flight.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Aerodynamics and Aeroacoustics of Helicopter Main-Rotor/Tail-Rotor Interaction
Authors:
AuthorsInstitution or Email of Authors
Ahmed, S.R.UNSPECIFIED
Yin, J.UNSPECIFIED
Date:1999
Status:Published
Keywords:Main-Rotor/Tail-Rotor Interaction, Aerodynamics, Aeroacoustics
Event Title:5th AIAA/CEAS Aeroacoustics Conference, Bellevue (usa), 10.-12.05.1999
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
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:02

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