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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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.|
|Journal or Publication Title:||Proc. First Joint CEAS/AQIAA Aeroacoustic Conf. 1995|
|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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