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Why are wind turbine blades long and skinny instead of short and fat?

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Posted by Energy Guy on April 11, 2010, 12:57 am
 


When you look at the average household electric fan, the blades are
large, with practically no clear space between the blades.

Sort of like the propeller on a boat.

But wind turbine blades are long and skinny.  Seems to me that they
catch very little wind-force being so skinny.

Why not make them wider (fatter) - more like an electric fan?  Might get
more RPM or torque at low wind speed that way.

Posted by vaughn on April 11, 2010, 1:05 am
 




Real wind turbines are not designed like a fan, they are designed like a wing.
Wings on most airplanes are long and relatively skinny.  For reasons that
someone else will have to explain to you, this us far more efficient than a
shorter, but fatter wing.

Vaughn



Posted by Josepi on April 11, 2010, 2:33 am
 

I am no expert but simply put, RPM speed, like a plane prop. Wide blades
cause too much air resistance.

I believe the pitch on a turbine blade, if continued would be much steeper
than a an air propulsion blade.



Real wind turbines are not designed like a fan, they are designed like a
wing.
Wings on most airplanes are long and relatively skinny.  For reasons that
someone else will have to explain to you, this us far more efficient than a
shorter, but fatter wing.

Vaughn



Posted by Energy Guy on April 11, 2010, 4:26 am
 

Josepi wrote:
 

If the goal of a house fan is to generate as much air flow as possible
with as small a motor as possible (and possibly as weak a motor as
possible) then the result is fan blades that are wide and fat.  When it
comes to making air move, blades that are wide and fat seem to be used
in more situations vs blades that are long and thin.

Wide and fat blades seem to be efficient at making air move.

Why isin't the converse true - that wide and fat blades are more
efficient at being moved by air?

Look at a jet engine compressor.  The blades are thin, but there are
many of them, resulting in a frontal surface area that is mostly blade.

Posted by Guido on April 11, 2010, 5:16 am
 

Energy Guy wrote:


2 words: Airplane propellors

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