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Popellers CFM
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Source：Internet Author：Unknow Pubdate：2008-04-03
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snizzle (Mechanical)
6 Oct 03 19:13
I conducting a little experiment and want to know how to calculate my propellers air flow (CFM cubic feet minute) at a given RPM. I’m using an eight inch prop with a six percent pitch with two blades and eighty percent efficiency.
chasbo (Chemical)
7 Oct 03 21:01
Your best bet is to get a pitot tube and run a traverse across it to verify your flowrate. You'll get a significant variation across the disk in speed, depending on the design.
snizzle (Mechanical)
8 Oct 03 19:00
Is there any known equations to calculate it on paper.
dspDad (Electrical)
13 Oct 03 20:35
flow is
cross sectional area
x distance/revolution 字串9
x rotational speed
x efficiency.
blade count is irrelevant for calculation.
for your specifics, r = 0.33 feet.
Area = pi * r squared = 0.35 ft2
Distance = 2 * pi * r * pitch/100 = 0.12 ft/revolution
efficiency = 0.8
net is about 0.035 ft3/revolution, or
35 f3/min per 1000 rpm.
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