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Unsteady Rotor Aerodynamics and Acoustics

Kuntz, M. and Heinrich, R. and Pahlke, K. and Raddatz, J. (1997) Unsteady Rotor Aerodynamics and Acoustics. 23rd European Rotorcraft Forum: 16.-18.9.1997, Dresden, Deutschland..

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Abstract

An aeroacoustic method for noise prediction of helicopter rotors in forward flight is presented. The unsteady aerodynamic flow field is computed using an Euler solver for arbitrary moving coordinate systems and flexible grids taking into account the prescribed rigid blade motion. Using the computed pressure data as input, two acousticmethods are applied, on one side the linear part of the acoustic analogy method and on the other side the Kirchhoff method. First for the 4-bladed ONERA/ECF 7AD rotor in high-speed forward flight ( &#61 0.4) the blade pressure data computed with the present method is compared with experimental data and numerical results of other authors e.g. Chimera method. A good overall agreement can be stated. For the same ONERA/ECF 7AD rotor test conditions defined in the HELISHAPE project are applied ( &#61 0.33). The comparison of computed pressure data with the experimental data is less.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1997, pages=14,
Title:Unsteady Rotor Aerodynamics and Acoustics
Authors:
AuthorsInstitution or Email of Authors
Kuntz, M.UNSPECIFIED
Heinrich, R.UNSPECIFIED
Pahlke, K.UNSPECIFIED
Raddatz, J.UNSPECIFIED
Date:1997
Status:Published
Keywords:helicopter rotor, aerodynamics, acoustics, noise prediction, high speed impulsive noise, Euler method, flexible grids, Kirchhoff..
Event Title:23rd European Rotorcraft Forum: 16.-18.9.1997, Dresden, Deutschland.
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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