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Prediction of Rotor Aeroacoustics in Forward Flight by a Lifting Surface Method

Lieser, J.A. and Lohmann, D. and Schultz, K.-J. (1994) Prediction of Rotor Aeroacoustics in Forward Flight by a Lifting Surface Method. In: Proc. American Helicopter Society, 50th Annual Forum, Washington DC, 11.-13.5.1994..

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Abstract

Calculation of flow around helicopter rotors in lifting forward flight requires a three-dimensional unsteady method. A boundary element method (Lifting Body Surface (LBS)) was successfully applied at DLR for the prediction of propeller aeroacoustics. Results from application to rotor aeroacoustic for non-lifting and lifting hover showed good agreement with Euler solutions and with experiment. Boundary element methods based on linear potential theory are efficient and easy to handle even for complex geometries. The aim of this work is to check the applicability of the LBS method to the rotor in lifting forward flight for design purposes. The LBS method is a supplement to lifting line methods used at DLR for the aerodynamic computation of rotors. It offers higher flexibility in planforms and profiles of rotor blades and it provides distributions on blade surfaces, important for acoustic calculations. The unsteady Euler methods also used at DLR are too.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1996, pages=15,
Title:Prediction of Rotor Aeroacoustics in Forward Flight by a Lifting Surface Method
Authors:
AuthorsInstitution or Email of Authors
Lieser, J.A.UNSPECIFIED
Lohmann, D.UNSPECIFIED
Schultz, K.-J.UNSPECIFIED
Date:1994
Journal or Publication Title:Proc. American Helicopter Society, 50th Annual Forum, Washington DC, 11.-13.5.1994.
Status:Published
Keywords:LBS-Methode, Aeroakustik
HGF - Research field:UNSPECIFIED
HGF - Program:Aeronautics
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
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:03 Apr 2006
Last Modified:27 Apr 2009 10:06

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