A recent development promises to allow larger, more efficient, and durable wind turbines by mitigating unsteady aerodynamic forces that generate fatigue and extreme loads on blades. Developer Aquanis Inc says the device requires minimal modifications to a new blade.
Aquanis’ Chief Technology Officer, John Cooney, holds a model-scale prototype of a plasma actuator.
The design features a blade-mounted plasma flow actuator, a software controlled, solid-state electrical device that is simple and inexpensive. When a blade-embedded sensor detects deflection, software would signal the device to generate plasma that modulates the aerodynamic lift and drag forces, similar to the effect of trailing edge flaps in airplane wings.
Each device weighs only a few ounces and would be placed on the outer 20 to 30% of the blade length near the tip. An electronic driver weighing a pound or two would mount inside the blade and provide 8 to 12 kV signals to the plasma generators. The device is based on patented technology developed at the University of Notre Dame. Aquanis has an exclusive license to the patent portfolio for the wind energy field of use.
All remedies tried to date use moving parts and are costly and complex to implement. “The simplicity of our plasma actuator technology provides the basis for an inexpensive, no-moving-parts control system that will let wind turbines react instantly to changes in the wind,” said Aquanis CEO Neal Fine. And an improvement in aerodynamic Article source: http://www.windpowerengineering.com/featured/blade-mounted-flow-actuator-promises-greater-turbine-power-production/