Small Wind Energy
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Wind Energy Question? Why do the wind mills have only 3 small blades?
I know that this is an older model but why 3 small blades. Why not 5? 8? I have a theory and I hoping to prove my dad wrong so let me hear your answers.
Here’s a picture of what I’m talking about.
http://www.unisa.edu.au/researcher/issue/2005may/images/winds.jpg
http://www.kidcyber.com.au/IMAGES/windfarm.jpg
Windmills with a high number of blades move at high velocities, and low amount of torque. The high velocity of the blades creates a lot of turbulence and drag, which is inefficient. In moderately high winds, a large number of blades can cause cavitation, which is a situation where turbulence ends up stopping the flow of air across the blade. The large, 3-blade models have very little drag, they have high torque needed to turn electrical generators, and they can operate in extreme winds without causing cavitation.
Researching Small Wind Turbines
