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Aerodynamics and Acoustics of Rotorcraft

Körner, H. and Pahlke, K. (1997) Aerodynamics and Acoustics of Rotorcraft. In: Paper No. 24. Symposium on Advances in Rotorcraft Technology, Ottawa (ca), 27.-30.05.1996.

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Abstract

A survey of the 75th Fluid Dynamics Panel Symposium is given. The paper concentrates on dynamic stall, experimental investigations on helicopter rotors, 3D aerodynamic prediction methods and acoustic prediction methods. CFD methods were applied to dynamic stall on oscillating airfoils. The agreement with experimental data is acceptable for light and medium stall if appropriate turbulence models are used and the transition is fixed. None of the methods was able to accurately predict deep dynamic stall. A large effort was spent for the investigation of the blade vortex interaction (BVI) noise. New national and multi-national experimental campaigns were conducted. Several researchers worked on the development and validation of aerodynamic and acoustic prediction methods for BVI. The efficiency of Higher Harmonic Control and of Individual Blade Control inputs for the reduction of BVI noise were investigated. The blade vortex miss distance was found to be the most important parameter for BVI noise. Methods for the prediction of high speed impulsive noise have been developed and encouraging results were presented.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999,
Title:Aerodynamics and Acoustics of Rotorcraft
Authors:
AuthorsInstitution or Email of Authors
Körner, H.UNSPECIFIED
Pahlke, K.UNSPECIFIED
Date:1997
Journal or Publication Title:Paper No. 24
Status:Published
Keywords:Dynamic stall, experimental investigations on helicopter rotors, 3D aerodynamic prediction methods, acoustic prediction methods, CFD
Event Title:Symposium on Advances in Rotorcraft Technology, Ottawa (ca), 27.-30.05.1996
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 Virtual Aerodynamic Rotorcraft
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Entwurfsaerodynamik
Deposited By: Claudia Grant
Deposited On:16 Sep 2005
Last Modified:14 Jan 2010 20:04

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