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发表于 2008-8-22 23:37
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来自: 瑞士
first, i m sorry, that i cannt tip chinese, although i m a native chinese.
the nummber of blades depends normally on the rated power and the wind speed.
for low power generation the tower may have any nummber of blades, except for Darrious blade. i.e. for home use. i v seen one blade type and 20 blades type in EU for several times.
the middle power type usually use 2 or 3 blades, because it is much more efficient than other types. the rotating and wind speed are now also important, because the higher speed means higher mechanical burdens. this is the very reason why we need pitch control on the wind tower. on the other hand, i dont think the wind is strong enough make the blade rotate, if they are very heavy.
for high power types, such like 5M or even 7M, it will be quite stupid to intall more than 3 blades onto the tower. only the weight of the blades can even brake the tower, especialy when in case of strong wind.
by the way, i think it will be also a nice idea to use the Darrious type in strong wind area.
after all, these are my own opinions. |
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