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There are basically 2 types of plastic Jet Turbines— those with rotating delivery tubes, and those with stationary delivery tubes. Each has its advantages and disadvantages.
The first one is the Rotating Delivery Tube Jet Turbine. The vertical delivery tube is between 50 and 100 feet tall. That is a lot of rotating pipe, but the height is needed in order to get a strong reaction from the turbine.
The electronics here, can be kept up and away from splashing water.
You have to be careful with such long pipe, as it must be glued straight, so that it will not wobble when turning.
One advantages, is that there are no rotating connections to deal with. At top and bottom, and sometimes in the middle, are bearings. The lower one, especially, must be a “thrust” bearing, such as an auto wheel bearing, because the delivery pipe is vertical, and the bearing must support both the pipe and the water.
There are several ways of making the top bearing. Some auto wheel bearings have a large enough hole in the middle to accommodate a PVC pipe. Or one can use a support with at least 3 casters, to keep it vertical.
A pulley, or gear can be mounted up out of water level to keep it dry, and rotate the generator/alternator more rapidly than the turbine. The arms that supply pressurized water to the jets, like an ice skater, can be used to adjust the speed of rotation. Longer arms go slower, and shorter arms go more rapidly.
The exact dimensions depend on your circumstances, so it will take some experimentation until you get the optimum configuration.
The Jets can be made as shown. Plastic funnels, cut to size, make good forms. You can even leave them in place, as ware will ensue. When it has progressed to the point where maintenance is required, this should be visible by examining the plastic that is extending.
Harding Water Putty, and various forms of expanding cement as formed by the cut funnels should last reasonably well.
The 3 side holes can also be much smaller, with sheet metal screwes inserted prior to installing the Harding Water Putty. Then form the putty tightly around them. That way they become tight without breaking anything.
Sprinklers work very well, and this should explain to you how they work.
The water supply can be of a variety of methods. Of course, standard hydro streams, either from up-stream water supplies or dams. I also show how such water flow can be supplied by waves and tides.
Another advantage of the PVC construction is it’s unaffected by saltwater, so it should work well with Wave Power.
Stationary Delivery Tube Style
The stationary delivery pipe method also has advantages and disadvantages. The pipe supports are easier, and the pipe does not need balancing. It still should be 50 to 100 feet tall, but it’s standing still.
A rotating coupling can be constructed as shown. This design shouldn’t leak like many couplings do, because it uses the Venturei effect to create a vacuum rather than pressurizing a seal of some kind. If it leaks a little air, it doesn’t hurt as it just makes the jets go faster.
This type also doesn’t need to be vertical, but can be connected directly to the generator with a horizontal shaft —assuming it’s turning fast enough.
However, the electronics has to be shielded form splashing water. The last thing you want is a sprinkler on your generator.
Thanks for your interest.
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