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Old 03-27-2020, 10:39 AM   #4 (permalink)
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Originally Posted by Frank Lee View Post
Automotive base bleed a.k.a. running a duct(s) from a higher pressure area to the back to "fill" the trailing wake. It has been discussed. IMHO if you have the excess space in the vehicle envelope for ducts, you could chop the top and do even better because ducts have their own drag. But what do I know; I haven't tested it and aero ducts in other places are enjoying some popularity.
Exactly what I would say. I would add that other aero ducts, at least on production cars, tend to be small and short--i.e. air curtain ducts, brake cooling ducts, differential cooler ducts, radiator ducts. As far as I know base bleed has never been implemented on anything outside of some concept cars and wind tunnel test models (but if I'm wrong, I would be curious to see some examples!).

Aston Martin did something similar with their Aeroblade on the DB11, but that's an aerodynamic spoiler--the duct outlet is sited at the base of the rear window and exhausts normal to the surface. I don't know where the intakes are.


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