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premature decay of wake vortices with differential- and oscillating flap setting

Voß, Guido and Melber-Wilkdending, Stefan and Rudnik, Ralf (2006) premature decay of wake vortices with differential- and oscillating flap setting. In: 2006 European Conference on Computational Fluid Dynamics. ECCOMAS 2006, 2006-09-05-2006-09-08, Egmond aan Zee (The Netherlands).

Full text not available from this repository.

Abstract

This paper gives an overview of the research on wake vortex decay using Differential Flap Setting (DFS) and Oscillating Flap Setting (OFS). The concept of DFS deals with the small deflection of flaps and elevator to produce additional vortices which interacts with the vortices from wing, elevator, flaps and wing-body-junction. Numerical calculations with the A340-300 model at this topic are presented in the first part of the paper. On the other hand the OFS concept works with the periodic movement of DLC (direct lift control) flaps and/or ailerons to trigger inherent instabilities of the vortices. The basic mechanism of the introduction of the periodic disturbance into the flow field is a periodic alternation of the spanwise lift distribution, i.e. of the circulation and spacing ratios of the distinct vortex pairs in the extended wake vortex nearfield. This can be achieved both by pitch oscillation and oscillating DLC flaps. Pitch oscillation alone are sufficient for accelerating Crow instability as proven already in the 1970s with small aircraft. One can distinguish between long-wavelength and short-wavelength instabilities. The second part of this paper is truncated on short-wavelength instability examinations i.e. the Crow instability.}

Item URL in elib:https://elib.dlr.de/46542/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:premature decay of wake vortices with differential- and oscillating flap setting
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Voß, GuidoUNSPECIFIEDUNSPECIFIED
Melber-Wilkdending, StefanUNSPECIFIEDUNSPECIFIED
Rudnik, RalfUNSPECIFIEDUNSPECIFIED
Date:2006
Journal or Publication Title:2006 European Conference on Computational Fluid Dynamics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Wesseling, P.UNSPECIFIED
Onate, E.UNSPECIFIED
Periaux, J.UNSPECIFIED
Status:Published
Keywords:wake vortices TAU-Code counter-/co-rotating Crow-instability
Event Title:ECCOMAS 2006
Event Location:Egmond aan Zee (The Netherlands)
Event Type:international Conference
Event Dates:2006-09-05-2006-09-08
Organizer:TU Delft
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Wake Vortices (old)
Location: Braunschweig
Institutes and Institutions:Flight Operations > Flight Facility Braunschweig
Institute of Aerodynamics and Flow Technology > Transport Aircraft
Deposited By: Voß, Guido
Deposited On:02 Jan 2007
Last Modified:15 Jan 2010 00:05

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