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Posted by Bob F on March 21, 2008, 10:01 pm
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Some ideas on this project.
As I mentioned before, charging just one battery is not going to work, unless
you work out a system to automatically cycle through the batteries so all are
equally charged. Something that charged one battery for a period (10 min?, 1
hr?), then switched to the remaining battery with the lowest voltage could work.
To build velocity of water out of a nozzle, a slow taper to the final nozzle
diameter would work best. Lengths of small diameter tube like I see in your
pictures are not the best. Tapered nozzles could be machined, or it possible you
could heat thick walled PVC pipe, and stretch it to create a tapered nozzle,
even curving it to wrap around your wheel.
If the max voltage you get no-load is too low, you need more velocity at the
nozzle to get the wheel spinning faster. If a smaller nozzle gives you higher
voltage by making a higher speed jet, that would work best from your described
conditions. Bigger pipe leading to the final taper will likely speed the water
flow. Eliminate smaller pipe as much as possible. The larger your main feed pipe
is, the better, to reduce friction losses. The larger the diameter of the pipe
that splits to feed seperate jets, the better. Have you measured the pressure at
the feed pipe where you split it for the nozzles? Does the pressure change much
when you start the water feed? If the pressure changes much, increasing your
main pipe size, or decreasing the diameter of your nozzles could help.
For a given nozzle diameter, the distance a nozzle can send water through the
air should be a good indication of the jets speed. Nozzle testing could be done
outside the generator with this in mind. I would expect that polishing the
inside of the nozzle would help, as would a clean, sharp edge where the water
exits.
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