Quote:
Originally Posted by AndyL
Big blower wasn't too big of an issue, have a lovely fan sitting here that pulls 5900cfm, was figuring on a 24" cross section...
Now where does that 5% come from - doesn't make much sense to me, 6" square model shouldn't need a 5' cross section tunnel...
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If you were going to do a 1/24-scale model of my CRX,you'd need a fan capable of delivering 650,918 cfm of air volume,while overcoming the skin friction of the tunnel.
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The 5% is a hard and fast rule of wind tunnel design if you're going to do force measurements.
At this scale:
*the model is 0.77 sq ft.
*the test section is 15.41 sq ft.
*The air velocity must be 42,240 feet per minute
*Which yields 650,918 cfm flow volume.
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If you want to model at this scale,you should do a water tunnel.An overhead gantry crane which straddles the tank can support the sting on which the model is secured.
Since water is 833 times more dense than air,you can get your proper Reynolds number at much lower velocity.