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A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements

Bramesfeld, G. und Maughmer, M.D. und Horstmann, K.H. (2004) A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements. 22nd AIAA Applied Aerodynamics Conference, Providence (usa), 16.-19.08.2004.

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Kurzfassung

A higher-order, lifting-surface method is presented that uses elements whose streamwise vorticity is distributed on a vortex sheet that lays vortex filaments, each having the transverse vorticity concentrated along its length, that form the leading and trailing edges of each element. The vortex filaments have a parabolic circulation distribution in spanwise direction and are of opposite signs. The vortex sheet has a linearly varying vorticity. An analytical solution is used to determine the velocity that is induced by each element at a particular location. One or several spanwise systems of such elements are used to model the lifting surface and the wake. The free wake is developed using a time-stepping method. The elements in the wake stretch and compress in spanwise direction during the roll-up process. The continuous wake and the absence of point or line singularities in the streamwise direction eliminate many of the numerical problems that are encountered with conventional vortex-lattice and panel methods. Thus, the method is a relatively fast tool for determining the location of the free wake and its interaction with complex wing geometries, especially when accurate load predictions are required.

Dokumentart:Konferenzbeitrag (Paper)
Zusätzliche Informationen: LIDO-Berichtsjahr=2005,
Titel:A Free-Wake, Lifting-Surface Model using Distributed Vorticity Elements
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Bramesfeld, G.The Pennsylvania State University
Maughmer, M.D.The Pennsylvania State University
Horstmann, K.H.NICHT SPEZIFIZIERT
Datum:2004
Status:veröffentlicht
Stichwörter:Higher Order Lifting Surface Method, Free Wake
Veranstaltungstitel:22nd AIAA Applied Aerodynamics Conference, Providence (usa), 16.-19.08.2004
Veranstalter :AIAA
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Köln-Porz , Braunschweig , Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Claudia Grant
Hinterlegt am:31 Jan 2006
Letzte Änderung:14 Jan 2010 19:43

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