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Old 01-14-2019, 03:43 PM   #5 (permalink)
freebeard
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This is on-topic.



The infinity wing is very close to what you have. Adding a triangular end plate might be enough. It presents a concave curved surface, but that might not be important.

Basically it induces a vortex over the top third of the wheel's face, creating an air curtain without the external duct.
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