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Effect of fractal endplates on the wingtip vortex

Gehlert, P., Cafiero, G. and Vassilicos, J.C. (2018) Effect of fractal endplates on the wingtip vortex In: 2018 AIAA Aerospace Sciences Meeting, 08-12 Jan 2018, Kissimmee, Florida, USA.

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Abstract

An experimental investigation was performed on the effect of fractal endplates on the wingtip vortex of a NACA 0012 semi span wing at a Reynolds number of 2 x 105. The endplates were obtained by introducing three different fractal patterns. Constant temperature anemometry and stereoscopic particle image velocimetry were employed to assess both the local flow properties as well as the spatial organization of the wingtip vortex. The results show that the introduction of a fractal endplate strongly affects both the geometry and the turbulence features of the vortex. In particular, it is found that the fractal geometry weakens the vortex by spreading the turbulent kinetic energy over a broader range of frequencies. We relate this loss of coherence to a faster dissipation of the vortex, thus paving the way to the employment of fractal endplates to reduce the hazard associated to such flow features.

Item Type: Conference or Workshop Item (Conference Paper)
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Gehlert, P.
Cafiero, G.g.cafiero@surrey.ac.uk
Vassilicos, J.C.
Date : 2018
DOI : 10.2514/6.2018-1796
Uncontrolled Keywords : Aviation; Kinetic energy; Kinetics; Reynolds number; Stereo image processing; Turbulent flow; Velocity measurement; Vortex flow; Constant temperature; Experimental investigations; Fractal geometry; Fractal patterns; Spatial organization; Stereoscopic particle image velocimetry; Turbulent kinetic energy; Wingtip vortex; Fractals
Related URLs :
Depositing User : Clive Harris
Date Deposited : 12 May 2020 17:11
Last Modified : 12 May 2020 17:11
URI: http://epubs.surrey.ac.uk/id/eprint/856382

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