Quote:
Originally Posted by freebeard
I put it in "Interesting Aeordynamic..." but don't delete. It's just lost there.
What can one see from the thumbnail, that he took tuft testing to find out?
|
The preliminary conclusion from the tuft study infers that both the plan-taper and diffuser angle are too extreme to protect the boundary layer from premature separation, counter-flow, eddies, and turbulence.
Also, from other reportings, the addition of rear wheel skirts and a full belly pan with diffuser would have amplified the 13.7% mpg result.
So, anyone wishing to improve on the tail would select smaller angles on the sides and bottom, for the 'second-approximation' design.
When the tufts behave as up top, you're essentially 'there.'
Additionally, if the coefficient of pressure profile were to be determined, this would be 'what you're looking for', by default.