Flow control arrangement for a wind turbine rotor blade

A rotor blade for a wind turbine, the rotor blade comprising:

• an aerodynamic device for influencing an airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, wherein the aerodynamic device is mounted at a surface of the rotor blade and comprises a pneumatic or hydraulic actuator of which the volume depends on the pressure of a fluid being present inside the pneumatic or hydraulic actuator, and
• a control unit for controlling the pressure of the fluid in the pneumatic or hydraulic actuator of the aerodynamic device, wherein
• the aerodynamic device is in a first configuration when no pressure application to the fluid in the pneumatic or hydraulic actuator is induced by the control unit,
• the aerodynamic device is in a second configuration when the control unit induces the application of a positive or negative pressure to the fluid in the pneumatic or hydraulic actuator,
• in the first configuration, at least a first section of the aerodynamic device protrudes away from the surface of the rotor blade into the airflow flowing from the leading edge section of the rotor blade to the trailing edge section of the rotor blade, and
• in the second configuration, the first section is positioned closer to the surface of the rotor blade than in the first position.