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Calculation and Comparison of Aerodynamic Coefficients of a 4-Bladed Tilt Rotor at Cruise and Hover Design Points (EUROFAR).

Lohmann, D. (1990) Calculation and Comparison of Aerodynamic Coefficients of a 4-Bladed Tilt Rotor at Cruise and Hover Design Points (EUROFAR). DLR-Interner Bericht. 129-90/02, 68 S.

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Abstract

The numerical investigations have been made to compare results of the Lifting Body Surface-Method (LBS-Method) with those of other methods. The results were presented on the EUROFAR Rotor Aerodynamics Meeting at MBB, Ottobrunn, 6 December 1989. Basic equation of the LBS-Method is a linearized integro-diffential equation well known a Ffowcs Williams/Hawkings equation. The solution is obtained by a velocity and an acceleration potential. The LBS-Method was developed for wings, propellers and rotors in subsonic flow. In order to include viscous effects a transpiration model can be used. However, here experimental 2-D airfoil characteristics are considered. It is shown that a modification of the LBS-Code is necessary for the efficiency that has to be replaced by the "Figure of Merit".Computed and compared are aerodynamic coefficients of a 4-bladed rotor at cruise and hover design points.

Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=1990, note=LSEG; 200,
Title:Calculation and Comparison of Aerodynamic Coefficients of a 4-Bladed Tilt Rotor at Cruise and Hover Design Points (EUROFAR).
Authors:
AuthorsInstitution or Email of Authors
Lohmann, D.UNSPECIFIED
Date:1990
Number of Pages:68
Status:Published
Keywords:Rotor-Aerodynamics, Acceleration Potential, Lifting Surface Method, T ilt Rotor
HGF - Research field:UNSPECIFIED
HGF - Program:other
HGF - Program Themes:other
DLR - Research area:UNSPECIFIED
DLR - Program:no assignment
DLR - Research theme (Project):L - The Innovative 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 10:04

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