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Sularus65 · 09-26-10, 08:58 PM

The purpose of a longer/skinner airfoil over a shorter/fatter one is torque. The long the fulcrum, the more leverage it applies. Those large wind turbines are not designed to travel at high speed. In fact, in high winds they usualy furl the blades to let the wind pass without turning the blades.
A design such as the one above is for a high-rpm application. I have spent over 11 years working on jet engines and have seen more than a few designs. The smaller blades each grab a larger portion of air. The shroud and the bullet nose help channel and keep air in the blades. I venturi would be useful in so much as it will speed up the air as it approaches the blades to increase its speed. At the same time you need a divergent zone behind the the blades before exiting the shroud. The divergent zone will increase pressure to help prevent backflow and slowing down the turbine. Hope this helps clarify some stuff.

09-26-10, 08:58 PM	#11
Sularus65 Lurking Renovator Join Date: Sep 2010 Posts: 14 Thanks: 2 Thanked 2 Times in 2 Posts	The purpose of a longer/skinner airfoil over a shorter/fatter one is torque. The long the fulcrum, the more leverage it applies. Those large wind turbines are not designed to travel at high speed. In fact, in high winds they usualy furl the blades to let the wind pass without turning the blades. A design such as the one above is for a high-rpm application. I have spent over 11 years working on jet engines and have seen more than a few designs. The smaller blades each grab a larger portion of air. The shroud and the bullet nose help channel and keep air in the blades. I venturi would be useful in so much as it will speed up the air as it approaches the blades to increase its speed. At the same time you need a divergent zone behind the the blades before exiting the shroud. The divergent zone will increase pressure to help prevent backflow and slowing down the turbine. Hope this helps clarify some stuff.