Quote:
Originally Posted by freebeard
I found this thread through Google Images!
I think this should be high-velocity. Otherwise a good summation of the concept, a variation on the Coanda nozzle.
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I believe it's a bit of both... high pressure at the inlet where air is piling up at the edge of the air dam, which narrows to produce high velocity. I got a close look at a parked BMW a while back and while the intake looked to be about 3cm by 10cm as per the text, the outlet looked to be in the region of 1-1.5cm wide (as they say, "discharged through a very narrow opening at high speed"), so it narrows down quite a bit. High pressure at the intake, high velocity at the outlet.
On a side note, seeing it in the flesh I was surprised how little of the front edge of the tyre it 'covered', despite knowing that only the middle section of the tyre had the air curtain - the tyres in question were 225/45 R18, so about 66cm high.