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In-flight simulation of wake encounters using deformed vortices

Published online by Cambridge University Press:  27 January 2016

D. Vechtel
D. Vechtel*
Affiliation:
DLR German Aerospace Center, Institute of Flight Systems, Department of Flight Dynamics and Simulation, Braunschweig, Germany
*
[email protected]
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Abstract

During the decay process the shape of wake vortices changes significantly which has an influence on the encounter characteristics, hence on the encounter hazard. In order to evaluate the influence of vortex deformation on the wake encounter hazard, in-flight simulations with the DLR research aircraft ATTAS were carried out. For a realistic analysis of wake encounters flow fields of matured vortices were generated with large eddy simulations. These flow fields were used for the determination of histories of induced forces and moments acting on the wake encountering aircraft. The force and moment histories were then fed into the equations of motions of the non-linear six degree-of-freedom in-flight simulation of the DLR research aircraft ATTAS. In order to compare different stages of vortex deformation, encounters were simulated in flight with wavy vortices and vortex rings. The most important benefit of the in-flight-simulation is the realistic environment, which enables a realistic assessment of pilots’ encounter acceptance. The analysed scenario was of a wake encounter during final approach. The encounter conditions correspond to separation distances of about 4nm and 5nm behind an aircraft of the ‘heavy’ category. During the encounters the ATTAS was flown under manual control. Altogether 31 encounters were simulated in flight, 9 with wavy vortices and 22 with vortex rings.

Type
Research Article
Information
The Aeronautical Journal , Volume 117 , Issue 1196 , October 2013 , pp. 997 - 1018
Copyright
Copyright © Royal Aeronautical Society 2013 

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