elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Contact | Deutsch
Fontsize: [-] Text [+]

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

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.

Full text not available from this repository.

Abstract

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
Authors:
AuthorsInstitution or Email of Authors
Yin, J.P.UNSPECIFIED
Date:1994
Status:Published
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

Repository Staff Only: item control page

Browse
Search
Help & Contact
Informationen
electronic library is running on EPrints 3.3.12
Copyright © 2008-2012 German Aerospace Center (DLR). All rights reserved.