Re: [TheTeslaTurbineList] Hot or Cold continued
- The most over looked aspect of the Tesla turbine is that vacuum is
necessary for correct function.
Turbulance at the outlet is caused by a gas exiting against air pressure
16psi. If the opening is 36 square inches it must over come 576 lbs of
resistance just to escape the outlet. In most if not all of his turbine
designs he has two turbines situated over a condensation tank. They
consist of a drive turbine and a vacuum turbine often on the same
shaft. The drive turbine vents steam into the condensation tank. The
vacuum turbine in a separate containment housing removes any air that
may have entered the tank through a leak.
Why does this work?
Consider the amount of work done by the drive turbine to the amount of
work consumed by the vacuum turbine. The drive turbine recieves 65 cubic
foot of steam per minute. The vacuum turbine must remove about (lets be
generous and say) 5 cubic foot of air that seeped in due to leaks.
Fairly clear that the vacuum turbine only requires a small amount of
force or work to remove the small amount of air. The steam has been
converted to water and is just sitting in a tank. The tank will fill at
the rate of one pound of water every 30 seconds. (Or about one gallon
every 4 minutes) This will of course be recycled to the boiler to
Inside the tank a vacuum is being produced because the vacuum turbine is
still trying to remove 65 cubic foot of mass. (Tesla recommended twice
as many rotors in the vacuum turbine of lighter material.) This would
compensate for losses. So a vacuum is created not only at the outlet of
the drive turbine, but also at the inlet. This is especially true if the
vacuum turbine is started before the drive turbine.
If a vacuum is created at the inlet nozzle before the steam enters the
containment housing some fairly amazeing things happen. An ordinary
nozzle ejecting into a vacuum will give twice the speed. (Maybe)
The turbine would be rotateing in a vacuum, no resistance to rotation
except the bearing resistance and not even that if magnetic bearings are
used. The turbine would accelerate as long as the pressure continued to
increase. If pressure ceased it would continue to turn as a flywheel in
a vacuum, making a perfect flywheel storage device. Torque would
continue to increase until the speed of the incomeing steam matched the
speed of the turbine. (They usually run at half the speed of the steam.)
Supersonic nozzles have air speeds around 1500 mph. Theoritically a
supersonic nozzle could move many tons in this fashion.