PSI

[pertymouth52]

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.

 

[CycloWizard]

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.

 

[dkozloski]

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.

 

[aigomorla]

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.

 

[Mark R]

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.

 

[PottedMeat]

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 kind of want to see that

 

[Billb2]

...i kind of want to see that

Here ya go....
http://www.emrtc.nmt.edu/images/rockettestsite_header.jpg

 

[SecurityTheatre]

Here ya go....
http://www.emrtc.nmt.edu/images/rockettestsite_header.jpg

LOL.

Getting close....

 

[herm0016]

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.

 

[Billb2]

OP, perhaps 60 cfm????

 

[Mark R]

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.

Yup. About 500 scfm.

 

[sm625]

Even 60 cfm would be a stretch...