Salient White Elephant

March 24, 2009

HAWT With No Shaft

HAWT With No Shaft

HAWT With No Shaft, Side View

HAWT With No Shaft

What if the blade is longer than the diameter of its supporting frame? In this case, the blade tends to act like a spring, pushing against the frame so that it deforms slightly into an oval shape. When the blade spins, centrifugal force makes the blade push even harder against the frame. But the aerodynamic force tends to bow the blade, giving it tend to pull on the frame and shorten its diameter. Perhaps these two opposing tendencies could approximately balance each other, thereby reducing loads on the frame. Bowing the blade has another interesting effect – it tends to make the blade tips orthogonal to local flow:

Tips of Bowed Blade More Orthogonal to Local Flow

The HAWT With No Shaft is supported by 5 guy wires. When the rotor yaws, it makes contact with only one guy wire at a time. When it comes to a point at which is about to make contact with a guy wire, the guy wire is moved out of the way. For ideas on how to move guy wires out of the way see my earlier blog post Scalable Tower for Very Large Wind Turbine. Here’s a combination of the HAWT With No Shaft and the Highly Scalable Horizontal Axis Wind Turbine:

HAWT With No Shaft, Highly Scalable Wind Turbine Variation

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