Salient White Elephant

March 13, 2009

Tilted Darrieus

Filed under: Vertical Axis Wind Turbine (VAWT) — Tags: , — Salient White Elephant @ 9:06 am

Guy wires are eliminated by tilting the tower into the wind. The tilt angle is a function of thrust – gravity and thrust vectors combine to produce a net compressive force on the tower:

Tilted Darrieus

To simplify the drawing, the diagram shows only two blades. In reality the machine would have three blades. Three bladed Darrieus rotors provide nearly constant torque. This allows the tilt direction and angle to be adjusted to an appropriate value for a given wind speed. (If only two blades were used, the force on the tower that tries to bend the top in the downwind direction would fluctuate a great deal.)

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