Abstract
The application of active trailing edge flaps in an industrial oriented implementation is evaluated in terms of capability of alleviating design extreme loads. A flap system with basic control functionality is implemented and tested in a realistic full Design Load Basis (DLB) for the DTU 10MW Reference Wind Turbine (RWT) model and for an upscaled rotor version in DTU's aeroelastic code HAWC2. The flap system implementation shows considerable potential in reducing extreme loads in components of interest including the blades, main bearing and tower top, with no influence on fatigue loads and power performance. In addition, an individual flap controller for fatigue load reduction in above rated power conditions is also implemented and integrated in the general controller architecture. The system is shown to be a technology enabler for rotor upscaling, by combining extreme and fatigue load reduction.
Highlights
The size of wind turbines has been increasing rapidly over the past years
New concepts for dynamic load reduction are focusing on a much faster and localized load control, compared to existing individual blade pitch control, by utilizing active aerodynamic control devices distributed along the blade span [1]. Such concepts are generally referred to as smart rotor control, a term used in rotorcraft research, and investigated for wind turbine applications over the past years in terms of conceptual and aeroelastic analysis, small scale wind tunnel experiments, and field testing [2, 3, 4, 5, 6]
There has been some focus on extreme load alleviation [9, 10, 11], it has not been generally evaluated in a realistic industrial load basis
Summary
The size of wind turbines has been increasing rapidly over the past years. Rotors of more than 160m in diameter are already commercially available. The current work describes the aeroelastic simulation activities on the load alleviation potential of a trailing edge flap in a realistic setup, close to the industrial certification-type of simulations.
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