Question by Amy: What is stalling in a wind turbine rotor?
pLEASE EXPLAIN THE PHENOMENON OF STALLING.
Best answer:
Answer by Bramble
There are two basic approaches used to control and protect a wind turbine: pitch-control and stall-control. In pitch-controlled turbines, an anemometer mounted atop the nacelle constantly checks the wind speed and sends signals to a pitch actuator, adjusting the angle of the blades to capture the energy from the wind most efficiently. On a stall-regulated wind turbine, the blades are locked in place and do not adjust during operation. Instead the blades are designed and shaped to increasingly “stall” the blade’s angle of attack with the wind to both maximize power output and protect the turbine from excessive wind speeds. There are relative advantages to both design approaches. A pitch-regulated turbine, for example, is generally considered to be slightly more efficient than a stall-regulated turbine. On the other hand, stall-regulated turbines are often considered more reliable because they do not have the same level of mechanical and operational complexity as pitch-regulated turbines.
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