Assembly and method for monitoring air flow at a surface of a rotor blade of a wind turbine

An assembly for monitoring air flow at a surface of a rotor blade of a wind turbine, the assembly comprising:

• a surface module configured to be arranged at a predetermined location on the surface, the surface module comprising two air inlets facing opposite directions along an axis;
• a sensor module comprising two pressure sensors, wherein one of the two pressure sensors is in fluidic communication with one of the two air inlets and the other one of the two pressure sensors is configured in fluidic communication with the other one of the two air inlets, wherein the sensor module is configured to output two pressure signals indicative of pressures sensed by the two pressure sensors;
• and
• a processing unit configured to determine at least one of a flow direction and a flow speed along the axis based on the two pressure signals;
• wherein the surface module comprises two additional air inlets facing opposite directions along the axis and being located above the two air inlets;
• wherein the sensor module comprises two additional pressure sensors, one of the two additional pressure sensors being in fluidic communication with one of the two additional air inlets and the other one of the two additional pressure sensors being in fluidic communication with the other one of the two additional air inlets, the sensor module being configured to output two additional pressure signals indicative of the pressures sensed by the two additional pressure sensors;
• wherein the processing unit is configured to determine at least one of an additional flow direction and an additional flow speed based on the two additional pressure signals.