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Originally Posted by The expert
A device through or over which the flow passes always has a local drag of its own (device drag). It’s key to minimise that. With your vane arrangement it might be worth looking at whether the internal channel should expand (diffusing), contract or remain constant. A diffusing flow will give the lowest device drag due to pressure recovery. A contracting channel will accelerate the flow and give more downstream effect. The question is: where does the best balance lie?
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I'll jump right on those coat-tails.
Converging vs diverging? You pointed to the fences on the openings of the Porsche Cayenne in some thread. Wasn't that for yaw angles?
A simple experiment might be to invert (and swap) the airfoil extrusions, and compare the results.