Active stall control for large offshore horizontal axis wind turbines: A conceptual study considering different actuation methods

Active stall control for large offshore horizontal axis wind turbines: A conceptual study considering different actuation methods

Pereira, R.
Van Bussel, G.J.W.
Timmer, W.A.

Aerospace Engineering

Aerodynamics, Wind Energy & Propulsion

2014-12-31

The increasing size of Horizontal Axis Wind Turbines and the trend to install wind farms further offshore demand more robust design options. If the pitch system could be eliminated, the availability of Horizontal Axis Wind Turbines should increase. This research investigates the use of active stall control to regulate power production in replacement of the pitch system. A feasibility study is conducted using a blade element momentum code and taking the National Renewable Energy Laboratory 5 MW turbine as baseline case. Considering half of the blade span is equipped with actuators, the required change in the lift coefficient to regulate power was estimated in Cl = 0:7. Three actuation technologies are investigated, namely Boundary Layer Transpiration, Trailing Edge Jets and Dielectric Barrier Discharge actuators. Results indicate the authority of the actuators considered is not sufficient to regulate power, since the change in the lift coefficient is not large enough. Active stall control of Horizontal Axis Wind Turbines appears feasible only if the rotor is re-designed from the start to incorporate active-stall devices.

http://resolver.tudelft.nl/uuid:f38bc7db-6a35-4214-b455-6832b0835861

IOP Publishing

1742-6588

Journal of Physics: Conference Series, 555 (2014), 012082

Institutional Repository

journal article

CC BY
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