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Heinz
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« on: October 21, 2011, 06:39:55 PM » |
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Just received a couple of pelton runners for my project. I had been planning to have the jet mounted near the top of the runner, but the drawing that the manufacturer sent shows the jet at the bottom. Which is best? Does the top mounted one cause drag from the used water or gain a little with the weight of some waste water in the spoons?
Heinz
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« Last Edit: October 21, 2011, 06:42:35 PM by Heinz »
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"Do, or do not. There is no 'try' " Yoda
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Richard Owen
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« Reply #1 on: October 21, 2011, 07:20:16 PM » |
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Pelton or Turgo?
Pelton runners have symmetrical spoons so the water should be jetted perpendicular to the shaft (horizontal if the shaft is vertical.)
Turgo runners look like slightly less than half a pelton runner (one curved side to the cup.)
On my turbine. the turgo runner is mounted with the cupped side down and the jet is at the top and slightly angled down.
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44 Yingli 230Wp panels feeding into 2x Solar Edge SE5000 inverters .20x 58mm SE, 20x 58mm SW, Solar Thermal feeding 320l thermal store. 10kW heat pump. 300W of Hydro Power . |
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Heinz
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« Reply #2 on: October 21, 2011, 07:24:44 PM » |
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Pelton. The runner is mounted vertically, generator shaft horizontal. So should the jet be near the top of the runner or the bottom? I suppose it won't make much difference, but just wondering which is the more efficient ....
Heinz
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"Do, or do not. There is no 'try' " Yoda
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Richard Owen
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« Reply #3 on: October 21, 2011, 07:30:00 PM » |
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Only ones of those I've ever seen have been on fire-engine pumps. They were jetted from the bottom. This page (about 2/3 of the way down) has a cut-away of a pelton turbine with the jet at the bottom.) |
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« Last Edit: October 21, 2011, 07:35:05 PM by Richard Owen »
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44 Yingli 230Wp panels feeding into 2x Solar Edge SE5000 inverters .20x 58mm SE, 20x 58mm SW, Solar Thermal feeding 320l thermal store. 10kW heat pump. 300W of Hydro Power . |
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ecogeorge
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« Reply #4 on: October 21, 2011, 08:10:37 PM » |
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If you're unsure , why not mount the pelton wheel in a horizontal plane with the generator vertical. That's how I'm building mine with 3 jets - very low head and flow -stream dry at the moment!
rgds George.
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Heinz
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« Reply #5 on: October 21, 2011, 08:20:57 PM » |
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I did consider a vertical generator setup, but decided to go the horizontal generator route and it's all welded together now except for the jet mounting, so it's a little late for a change. Looking at the pile of scrap this is made from, it was just easier and more stable with the generator horizontal...
Heinz
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"Do, or do not. There is no 'try' " Yoda
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camillitech
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« Reply #6 on: October 22, 2011, 06:15:52 AM » |
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Don't think that it matters a great deal Hienz, my Powerspout has two jets, one top and one bottom. Keep us posted with developments please  Cheers, Paul |
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http://lifeattheendoftheroad.wordpress.com/12kw Lister 11m turbine tower 10 hundred ah 48v battery bank 900' pennstock 8kw woodburner 7kw Lister 6 bladed Rutland 50w of solar 4 and a half Kw inverter 3kw Lister 2 hydro turbines and a Proven in a pear tree :-) Raasay, 57 27 537 N 06
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camillitech
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« Reply #7 on: October 22, 2011, 10:53:19 AM » |
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Just a thought Heinz, been reading through the installation manual and I see that all single nozzle Powerspouts have the jet an the bottom, so perhaps there is some advantage.
Good luck, Paul
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http://lifeattheendoftheroad.wordpress.com/12kw Lister 11m turbine tower 10 hundred ah 48v battery bank 900' pennstock 8kw woodburner 7kw Lister 6 bladed Rutland 50w of solar 4 and a half Kw inverter 3kw Lister 2 hydro turbines and a Proven in a pear tree :-) Raasay, 57 27 537 N 06
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smegal
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« Reply #8 on: October 22, 2011, 11:25:22 AM » |
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Just received a couple of pelton runners for my project. I had been planning to have the jet mounted near the top of the runner, but the drawing that the manufacturer sent shows the jet at the bottom. Which is best? Does the top mounted one cause drag from the used water or gain a little with the weight of some waste water in the spoons?
Heinz
For a single jet, I'd place the jet at the bottom. I doubt it makes that much difference but water will be falling through the wheel when it has had its energy exhausted. That may add some drag (probably negligible but still). |
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"Hell, there are no rules here, we are trying to accomplish something." Thomas Edison
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