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03-05-2007 | 08:16 PM

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aeomaster32

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From: Maroochy River, AUSTRALIA

RE: Vortex Generators

Quote:

ORIGINAL: Alixman984

Hi Everybody;

I'm testing the effect of vortex generators on stall angle of a NACA 6313 aerofoil in low-speed wind tunnel.
Based on my understanding VGs are used to delay the separation and thus delay the stall.
however in my test they accelerate the stall.
my plain aerofoil stalled at around 16 degrees, however when placing the aerofoil on different chord positions and different spaces apart, in ALL situation my aerofoil stalled earlier.
I'm trying to find a reason behind it, or any test result from any journal/book that could explain my situation.

Any help is highly appreciated.

Thanks

For a start, without a wind tunnel and smoke, you are working in the blind. Every wing is unique. It has been discovered that if you can identify areas where the boundary layer has weakened, and is about to separate, that a turbulater can put energy back into the flow, delaying separation. Basically the turbulater is designed to create little vortices. Without identifying these areas, I think the idea is not worth pursuing.

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