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Comparison of Rotor Noise Predictions by a Lifting Surface Method and Euler Solutions Using Kirchhoff Equation.

Kuntz, M. and Lohmann, D. and Lieser, J.A. and Pahlke, K. (1995) Comparison of Rotor Noise Predictions by a Lifting Surface Method and Euler Solutions Using Kirchhoff Equation. In: Proc. First Joint CEAS/AQIAA Aeroacoustic Conf. 1995. First Joint CEAS/AIAA Aeroacoustic Conference (16th AIAA Aeroacoustic Conference).

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Abstract

Computational results of two acoustic methods, a linear and an Euler/Kirchhoff method used at DLR are compared against each other and with hovering rotor test results. The considered rotors are models of the BO-105 and UH-1H helicopter. In order to check the dependency of the acoustic prediction on linear and non-linear calculated aerodynamic input data, a subsonic BO-105 test case was investigated. Here the aerodynamic calculations were performed with a Lifting Surface and 3D-Euler Code. All calculated acoustic loading and thickness noise contributions are underpredicted compared with experimental results. The complete linear calculation of aerodynamics and acoustics (Lifting Surface Code LBS/Farassat formulation 1) compared with Euler/Farassat formulation 1 and Euler/Kirchhoff calculations show an acceptable agreement. For tip Mach numbers from 0.85 to 0.95 linear and non-linear computed acoustic signatures were compared with test results.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1995, pages=13,
Title:Comparison of Rotor Noise Predictions by a Lifting Surface Method and Euler Solutions Using Kirchhoff Equation.
Authors:
AuthorsInstitution or Email of Authors
Kuntz, M.UNSPECIFIED
Lohmann, D.UNSPECIFIED
Lieser, J.A.UNSPECIFIED
Pahlke, K.UNSPECIFIED
Date:1995
Journal or Publication Title:Proc. First Joint CEAS/AQIAA Aeroacoustic Conf. 1995
Status:Published
Keywords:rotor noise prediction, helicopter, aeroacoustics, hover flight conditions, Lifting Surface Method, Euler Method, Farassat Method, Kirchhoff Method
Event Title:First Joint CEAS/AIAA Aeroacoustic Conference (16th AIAA Aeroacoustic Conference)
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 10:05

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