Sensor device for an aerodynamic element

A wind turbine comprising:

• an aerodynamic element;
• a sensor device for detecting flow-separation on the aerodynamic element, the sensor device comprising:
• a plurality of compliant elements with aerodynamic and/or structural properties designed to allow flow-induced vibrational motion in an air current downstream of a trailing edge of the aerodynamic element, wherein the plurality of compliant elements are designed as at least one of:
• filaments of a comb-structure, teeth of a serration, filaments of a combed serration, and a combed trailing edge treatment device;
• a sensor-element designed to measure vibrations of the plurality of compliant elements at different times;
• a comparator unit configured to determine if the vibrations of the plurality of compliant elements exceed a predefined threshold where flow-separation occurs without a loss of lift;
• and
• a signal-unit configured to create a control signal based on the vibrations of the plurality of compliant elements if the comparator determines that the measured vibrations exceed the predefined threshold,
• a control unit, the control unit configured to receive the control signal from the signal-unit of the sensor device and adjust a pitch angle and/or a rotation speed of the aerodynamic element according to the control signal.