Quote:
Originally Posted by Big time
It would be interesting to read Flugel and Frey studies to see how those deflector wings worked.
By some reason they used multiple deflectors.
Maybe they must work like multi element airfoils to be cost effective
Those look quite similar to multi element turning vanes used in wind tunnels
If they work then I think they can be added to the rear outer corners
Their performance could be increased even further by ducting exhaust air thru them.
And/Or these multiple element deflectors could be used in a high angle diffuser.
While the high angle of the diffuser keeps overall rear area to a minimum, such high angle may cause increased drag and even flow separation.
So these multi-element deflectors should ease air turn in while reducing drag.
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*All these deflectors were tested and failed to produce a drag reduction.Some increased drag.
*The blown slot will work if you have a perpetual-motion device to produce the air volumes necessary.
*Ducts have been tested and they failed also.
What may work in an aeronautical application doesn't necessarily apply to a bluff body in ground proximity.And you need to be about 12-ft off the road surface to get out of ground effect.