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Rationale for inclusion of decay enhancing devices into solution PJ.02-01

Rationale for inclusion of decay enhancing devices into solution PJ.02-01. the highest risk to encounter wake vortices prevails in ground proximity (see statistics right)

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Rationale for inclusion of decay enhancing devices into solution PJ.02-01

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  1. Rationale for inclusion of decay enhancing devices into solution PJ.02-01 • the highest risk to encounter wake vortices prevails in ground proximity (see statistics right) • consequently wake vortex behaviour in ground proximity mostly impedes reduced separations by dynamic wake vortex advisory systems (D-PWS, WDS) • the suggested decay enhancing devices accelerate wake vortex decay in ground proximity and herewith • may increase safety • may increase potential capacity gains of wake vortex advisory systems (D-PWS, WDS)

  2. Rationale for decay enhancing devices  previous work • the functionality of the suggested method has been demonstrated in towing tank experiments, numerical simulations (LES), and field experiments • key elements of the patented approach: • strong vortices are produced that actively approach the wake vortices (Fig. right above) • and then propagate actively along the wake vortices in order to trigger premature decay (Fig. right below) - A. Stephan, F. Holzäpfel, T. Misaka, R. Geisler, R. Konrath, Enhancement of aircraft wake vortex decay in ground proximity - Experiment versus Simulation, CEAS Aeronautical Journal, Vol. 5, 2014, pp. 109-125, DOI 10.1007/s13272-013-0094-8.  - A. Stephan, F. Holzäpfel, T. Misaka, Hybrid simulation of wake-vortex evolution during landing on flat terrain and with plate line, Int. J. Heat Fluid Flow, Vol. 49, 2014, pp. 18-27, http://dx.doi.org/10.1016/j.ijheatfluidflow.2014.05.004. - F. Holzäpfel, A. Stephan, N. Tchipev, T. Heel, S. Körner, T. Misaka, Impact of Wind and Obstacles on Wake Vortex Evolution in Ground Proximity, AIAA Paper 2014-2470

  3. flight experiment with research aircraft HALOat special airport Oberpfaffenhofen on 29 - 30 April 2013 field experiment data suggest that the lifetime of the longest-lived (potentially most dangerous) vortex can be substantially reduced by a plate line

  4. Rationale for decay enhancing devices  potential arrangement of plate lines (red dashes) at an airport 140 m 300 m 300 m 20 m plate dimensions (LH) : ~9 m  ~4,5 m

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