Method and apparatus for measuring air flow condition at a wind turbine blade

A wind turbine comprising a rotor having a plurality of rotor blades and a hub, said wind turbine further comprising:

• a sensor device attached to at least one rotor blade of the plurality of rotor blades of the wind turbine, said sensor device comprising:
• at least one pressure side air flow sensor rake attached at a trailing edge of the at least one rotor blade and providing a pressure side sensor signal;
• and
• at least one suction side air flow sensor rake attached at the trailing edge of the at least one rotor blade and providing a suction side sensor signal;
• and
• a controller that is configured to adjust a pitch angle of the at least one rotor blade as a function of the sensor signals,
• wherein each air flow sensor rake comprises a plurality of sensors arranged at a plurality of distances away from a side of the at least one rotor blade and configured to detect characteristics of a boundary layer of an air flow associated with the side of the at least one rotor blade.

A wind turbine comprising a rotor having a plurality of rotor blades and a hub, said wind turbine further comprising:

• a sensor device attached to at least one rotor blade of the plurality of rotor blades of the wind turbine, said sensor device being configured to provide at least one sensor signal;
• and
• a control unit for adjusting a pitch angle of the at least one rotor blade as a function of the at least one sensor signal,
• wherein the sensor device comprises:
• at least one inflow angle sensor attached at a leading edge of the at least one rotor blade and configured to provide an inflow angle sensor signal;
• at least one air flow sensor rake attached at the trailing edge of the at least one rotor blade and configured to provide a side airflow sensor signal,
• wherein each air flow sensor rake comprises a plurality of sensors arranged at a plurality of distances away from a side of the at least one rotor blade and configured to detect characteristics of a boundary layer of an air flow associated with the side of the at least one rotor blade.