front wheel "air curtain"
 

I've seen a couple articles on getting some of the effect of front wheel spats by ducting air from high pressure zones in the front bumper to the front outer edges of the front wheels. Any one tried this with useful results? How? Pics?

Yes, your search term is 'Edgarwit'.

In general, you want a converging duct and the air is moving sideways where you pick it up. Some OEM examples are fairly small, I suspect a high-speed jet is the result rather than a curtain.