Quote:
Originally Posted by freebeard
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.