Re: Digest Number 406
Designing the air pump follow some of the following.
1. Inlet to out let radius should be 3:1,
2. The exit area of the volute should be calculated to be the
maximum CFM you wish the air pump to have and the area is determiend
by the air velocity at the exit which is about 75% (est.) of the
outer tip speed of the disk pack you are using.
3. Disk spacing from .018 through .050 will be within 75% of each
other for efficentcy.
4. Back presure capability is just the mass x velocity / area of your
How many disks is a bit harder to calculate but relate to the volume
of air you wish to move and will take a little hit and miss. Try
using .025 spacings and disk width then skip disks if the air flow is
too low, make the out let orfice varible of adjustable. You most
likely are looking at a 8" or more disk size.
--- In TeslaTurbine@yahoogroups.com, "Paul & Patricia Bartlett"
> Hi Guys Help me out
> Here's something a little more to the point.
> I need a dust collection system for my shop. A Tesla pump would (I
> think) be a lot quieter than one of those impeller monstrosities. I
> want to use a 3650rpm 3hp motor. What OD and how many blades do I
> to use that power?