| 摘要 |
A wind turbine variable is controlled by detecting air flow conditions in front of the leading edge 4 of the blade 2. One or more Laser Doppler Anemometers (LDAs) 12 may be mounted on or incorporated into the blade 2 to determine air flow velocity in the region in front of the leading edge 4 of the blade 2. The measured flow conditions may be used to control the position of a control surface such as a trailing edge flap 30 or the rotor speed. The LDAs 12 may comprise lasers of different frequencies to enable more than one component of flow velocity to be measured. |
