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17 Nov 2011 @ 12:25 AM
bubbles asked:
how many blades does a wind turbine need? some have three others have four. What is best? Mine has four and is 3ft and homemade it runs from a permanent magnet dc motor is it best to have three blades or four for best output?
how many blades does a wind turbine need? some have three others have four. What is best? Mine has four and is 3ft and homemade it runs from a permanent magnet dc motor is it best to have three blades or four for best output?
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- Why is GRP used in the manufacture of wind turbine blades?
- How much wind power is left over after going thru a wind turbine?
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doen’t matter how many blades, just so long as they are matched to the generator and are balanced.
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For balancing issues- I believe three to be the best because there are no right angle forces.
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There is no single answer.
This will largely depend on the speed at which the trubine is going to operate. The different designs lead to different “coefficient of performance” according to the speed. Here are some links to explain the basic science.
=&h=280&w=360&sz=6&hl=fr&start=8&um=1&tbnid=DPaXeDgXfyXdvM:&tbnh=94&tbnw=121&prev=/images%3Fq%3Dwind%2Bturbine%2Bblade%2Bbetz%26um%3D1%26hl%3Dfr%26lr%3Dlang_de%257Clang_en%257Clang_fr%26safe%3Doff%26client%3Dfirefox-a%26channel%3Ds%26rls%3Dorg.mozilla:fr:official
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different blade configurations good for different situations. 2 or 3 good for high speed turbine with machined parts, many more for a low speed home made job like the pumps in old cowboy movies.
My husband works on the commercial wind turbines. THE most efficient wind turbine ever developed has only ONE blade!!
Generally speaking, three blades are best, or any ODD number. It is easiest to balance anything with blades, when they have an odd number of blades.
This goes for ceiling fans, wind turbines, prop airplanes, ect. It’s much, much easier to keep everything nicely in balance, and not wear bearings out, with an odd number of blades.
~Garnet
Permaculture homesteading/farming over 20 years
Make Residential Solar Panels
Three blades