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Old 06-22-2019, 02:07 PM   #40 (permalink)
aerohead
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suction

Quote:
Originally Posted by freebeard View Post
Interesting. Any idea of what 'suction upstream of the belt' means? Aren't the belt and the air moving at the same speed?
On the highway,the road is stationary and it doesn't have any boundary layer,just the car's body.In the wind tunnel,the moving belt may be at a different velocity as the airstream,creating a boundary layer which must be vacuumed off,so as not to create a condition a car wouldn't see in the real world.In some stationary-floor tunnels,they just lift the car up enough to clear the thickness of the boundary layer which forms.The uprights at DARKO, elevated the vehicles a bit,as there's no suction slot there,nor at the A2 tunnel.
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