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Old 07-25-2018, 10:44 AM   #10 (permalink)
aerohead
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perforated

Quote:
Originally Posted by freebeard View Post
Those 4-6" long spray-guards are limber enough to move at their ends. 2-3" bristles might be more rigid and act as a baffle, maintaining a pressure gradient.

But still accommodating ground strikes.

Does a perforated plate pass more air when it is perpendicular or parallel to the direction of air flow?
I agree with gumby79,that hole density and plate thickness would matter.
The edges of the holes would make a difference too.
A sharp-edged hole would always have a severe vena contracta flow constriction.
At some degree of 'entry' rounding the vena contracta would be eliminated altogether,with the highest possible flow rate.
At perpendicular flow,the plate itself would have full separation all around it,except at its attachment point.
The holes would flow the most,as the static pressure across the membrane would be greatest.
Parallel with the flow,in free flow,there'd be no flow through the holes,as pressure alongside the plate would be identical.
In asymmetrical,parallel flow,as long as any transverse pressure gradient was present,there would be flow 'though' the plate.
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