Zibi, J.* and Polacsek, C.* and Kuntz, M. and Rouzaud, O.* *ONERA (1997) Helicopter Rotor Noise Prediction Using ONERA and DLR Euler/ Kirchhoff Methods. AHS Specialist's Meeting for Rotorcraft Acoustics and Aerodynamics 28.-30.10.1997, Fort Magruder Inn, Williamsburg, VA (USA)..
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Euler/Kirchhoff methods have been developed at ONERA and DLR to predict the High Speed Impulsive (HSI) noise generated by helicopter rotors in hover or in forward flight. The main purpose of this common work is to validate the aeroacoustic computations with delocalized test cases. In hover, the aerodynamic and acoustic results obtained by each partner are in good agreement with experiment. In forward flight, a first set of computations is performed with three different sized "classical" grids. For both partners, the pressure coefficients on the blade are in better correlation with experiment when the grid is refined. However, the capture of the shock waves propagation beyond the blade is not accurate enough to perform satisfactory Kirchhoff computations. The minimum pressure peak and the recompression slope of the acoustic pressure signatures are not accurately predicted, whatever the grid refinement of the Kirchhoff surface locations may be. An.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=1997, pages=16,|
|Title:||Helicopter Rotor Noise Prediction Using ONERA and DLR Euler/ Kirchhoff Methods|
|Keywords:||helicopter rotor, aerodynamics, acoustic, noise prediction, high speed impulsive noise, Euler method, Kirchhoff method|
|Event Title:||AHS Specialist's Meeting for Rotorcraft Acoustics and Aerodynamics 28.-30.10.1997, Fort Magruder Inn, Williamsburg, VA (USA).|
|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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