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Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
Ive been researching air and water driven tesla turbines. And I see that the working fluid starts at the periphery and moves towards the middle. but is it possible to reverse that process. turning the shaft with an electric motor, which moves the fluid ?
my brain is a blur.
I think this vid shows fluid entering the center, and exiting at the periphery.
and this quote from wiki I don't fully understand.:
If a similar set of disks and a housing with an involute shape (versus circular for the turbine) are used, the device can be used as a pump. In this configuration a motor is attached to the shaft. The fluid enters near the center, is given energy by the disks, then exits at the periphery. The Tesla turbine does not use friction in the conventional sense; precisely, it avoids it, and uses adhesion (the Coandă effect) and viscosity instead. It utilizes the boundary layer effect on the disc blades.
Smooth rotor disks were originally proposed, but these gave poor starting torque. Tesla subsequently discovered that smooth rotor disks with small washers bridging the disks in ~12–24 places around the perimeter of a 10″ disk and a second ring of 6–12 washers at a sub-diameter made for a significant improvement in starting torque, without compromising efficiency.
Registered Member #53
Joined: Thu Feb 09 2006, 04:31AM
Location: Ontario, Canada
Posts: 638
There was a guy on hackaday who had the idea of stacking several (dozens?) of small disks to use as a hard vacuum pump. The comment section came to the conclusion that the speeds needed to pull a good hard vacuum with a tesla turbine pump would be more than most materials could hold up to and well beyond what most bearings could deal with if not properly balanced.
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
@johnf And yes, a Turbo Molecular Pump runs f*in' fast. IIRC, the ones we used on MRI magnets were about 50k rpm, and were about the size of a small microwave oven. The reason for using an oil-less turbo rather than an oil diff pump was the high remediation cost of a power cut in the middle of a 24h pump down.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
I'm thinking there is an ideal distance between each plate, based on a whole bunch of factors.
viscosity of water, and restriction and so on.
I still don't understand this part:
Smooth rotor disks were originally proposed, but these gave poor starting torque. Tesla subsequently discovered that smooth rotor disks with small washers bridging the disks in ~12–24 places around the perimeter of a 10″ disk and a second ring of 6–12 washers at a sub-diameter made for a significant improvement in starting torque, without compromising efficiency.
Does this mean a few tiny radial fins ? as in a traditional centrifugal fan ?
it seems like the inward to outward spiral of fluid would be opposed by such "washers" with turbulence.
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Tesla Turbine.
