Quote:
Originally Posted by Old Tele man
Aerohead, to be honest, I don't know the answer to your question (FoC'78), only that the current Ford grills, with their multiple, broad, wide, slats are *supposed* to be 'dynamically' aerodynamic with increased speed, ie: air flow 'thru' the grill is reduced as the speed is increased...similar to *how* hydrodynamic water flow becomes 'blocked' through wire-mesh at higher speeds but not at lower speeds.
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I'll guess that its a boundary layer effect.The slats are so small,they'll have a low Reynolds number at lower speed and air will have free reign into the opening,then at some higher velocity,it will transition to a turbulent boundary layer,air will stall over the sections because of their relative angle of attack and the turbulence will choke off some of the flow.