Yin, J.P. (1994) Prediction - and its Validation - of the Acoustics of Multiblade Rotors in Forward Flight Utilising Pressure Data from a 3-D Free Wake Unsteady Panel Method. Proceedings, 20th European Rotorcraft Forum, 04. - 07.10.94 in Amster dam/Niederlande.
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A newly developed high resolution 3-D Panel method to predict the unsteady aerodynamics of multiblade helicopter rotors has been used to generate the input data for an also new Acoustics code based on Farassat's Formulation 1A of the FWH/equation. The combination of this aerodynamics/aeroacoustics codes is used to predict the acoustics of multiblade rotors in hover and forward flight. Of special interest are cases of low speed descent where severe BVI is known to occur. The use of panel method excludes the treatment of shocks in the rotor flow field. No restrictions are placed on the blade profile, planform or other geometry characteristics as well as blade motions. The acoustic pressure-time history, mid-frequency sound pressure levels and other predictions are validated with flight test and wind tunnel data for two and four blade rotors in hover and forward flight modes. Some comparisons with the predictions of the well known WOPWOP code have also been performed.
|Document Type:||Conference or Workshop Item (Paper)|
|Additional Information:||LIDO-Berichtsjahr=1994, pages=23,|
|Title:||Prediction - and its Validation - of the Acoustics of Multiblade Rotors in Forward Flight Utilising Pressure Data from a 3-D Free Wake Unsteady Panel Method|
|Keywords:||3-D Panel Method, Unsteady Pressure Distribution, Multiblade Rotors, Rotor Acoustics|
|Event Title:||Proceedings, 20th European Rotorcraft Forum, 04. - 07.10.94 in Amster dam/Niederlande|
|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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