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Old 02-08-2018, 05:01 PM
EracerFL EracerFL is offline
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Join Date: Dec 2006
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Default Shark skin-inspired vortex generators

Inspired by the drag-reducing properties of the tooth-like denticles that cover the skin of sharks, we describe here experimental and simulation-based investigations into the aerodynamic effects of novel denticle-inspired designs placed along the suction side of an aerofoil.
http://rsif.royalsocietypublishing.o...5/139/20170828

The results shown in figure 4 for the best shark denticle foil exhibit three key features. First, we observe an increase in lift at almost all angles of attack for the foil with shark denticles compared to the corresponding smooth control

http://rsif.royalsocietypublishing.o...600&carousel=1
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Old 02-08-2018, 10:00 PM
gisnar gisnar is offline
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Default Re: Shark skin-inspired vortex generators

Interesting, every decade or so there are groups of biology folks who 'discover' shark skin. While this is an interesting paper the results are not great ( see the very small delay in stall). More interesting are the papers where they make the entire airfoil out of ' shark skin'

There are two things going on here.
1) large scale streamwise vortices which transport momentum and delay separation. This is the mechanism behind most vortex generators.
2). Spanwise periodic small scale structures, which generate sub boundary layer streamwise structures, which reduces skin friction. This is what riblets are intended to be used for. Riblets work especially well in the range of commercial aircraft cruise speeds. The problem has always been application and maintenance costs. They were tried 20 years ago on the london to sydney route and as the riblets filled up with dust over a few years and lost their effectiveness. Keeping them clean, because they are so small, is a challenge but one that they are working on.
David
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