Bladeless wind turbine example via MIT Technology Review
A wind turbine that uses boundary layers instead of blades to generate power has been patented by Solar Aero, a New Hampshire based not-for-profit scientific research organization.
Modeled on the 1913 Tesla steam turbine, the Fuller turbine is virtually silent and completely enclosed, which avoids many of the drawbacks of bladed turbines such as noise, radar interference, visual pollution and wildlife injuries.
Solar Aero’s Howard Fuller says the principal of operation is roughly the same as for the Tesla steam turbine.
“Closely-spaced discs trap the motive fluid molecules (in this case air) in a laminar flow adjacent to the disc surface. This provides aerodynamic drag, which imparts force to the disc surface. By using multiple discs, the turbine then provides considerable torque to accelerate the rotation of the central driveshaft, which is directly coupled to an alternator, typically located at the base of a tower, or alternatively co-located on a rooftop.”
The turbine is likely to have a cut-in speed of about 3.5 knots and optimum speed is about 20 knots and near transparency to radar microwave transmissions can be achieved with proper construction materials and techniques.
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