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PSI

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pertymouth52

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I'm in the process of producing hand held fans. The design consists of a battery operated DC micro motor that I can attach a 2 inch or 3 inch aluminum fan blade. The unit will be placed in a chamber and needs to push about 60 psi through a 3/4 inch diameter hole at the end of the chamber.

My first prototype used a 12V, 15,000 rpm DC micro motor attached to a 2" diameter fan blade but wasn't producing enough psi. How many rpm will it take to produce the 60 psi? Thanks.
 
Depends on the precise design of your fan assembly. I don't think there's a straightforward way to answer this - you'd probably need to use computational fluid dynamics simulations to figure it out with any degree of accuracy. Otherwise, trial and error.
 
To maintain 60 PSI out of a 3/4" pipe is going to take a couple of hundred horsepower so you better be thinking diesel engine rather than DC micro motor.
 
i think it would be far easier to get a large compressor + tank... store the compressed air and have it feed out at 60psi.

60psi is a lot of psi... ur trying to get more pressure then whats in tires via fan.
 
Some rough back of envelope calculations suggest that you'd need a 20 kW motor to maintain a 60 psi pressure against a 3/4" hole.

I doubt that even 150,000 rpm would be able to generate that level of pressure.
 
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i think the point the op is missing, is the volume of air it will require to maintain 60psi through an opening of that size is gigantic.
 
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