I have read a lot of threads about the Banki Turbines that were built and used. I have never seen info on the RPM's available ?? Has anyone ever taken readings of the RPM's ??
I have a neighbor, with 60 GPM of water at 30' of fall. YES, I did measure with the 5 gallon bucket shoved under the 4" outlet pipe in the concrete dam.
I have studied several designs of Mitchell-Banki turbines, and have decided to try the Ossberger design. It fully utilizes ALL the water from the input, unlike most homebuilt units, that spray water over the top of the turbine.
I am thinking about using an alternator at 2KW. It will be self excited, so, no need for external excitation. The Alternator is 1800 RPM rated. Gearing is possible, although I would prefer to not have to use it, if possible. An induction motor, at under 1000 RPM's, might be another option. Would need to apply external voltage, maybe a 12 Volt battery and inverter ??, to excite the motor, once up to speed ?? Is this even possible ??
I am trying to design a water control device, to regulate the cycles or voltage to keep within the 120-240V range. So far, a governing device has not been decided on. I was thinking about a linear actuator, that would open and close a sliding valve, or, open and close a ball valve. It would need to be activated by the Alternator, with an electronic monitoring device. It may be a little slow to operate, but, should work well, with plenty of power.
According to my calculations using several different calculation sites, there should be between 1-2 KW of power available, IF I can control every drop and use the governing system.
Anyone feel like commenting on this project ??