Up Wind or Down Wind Generator
Up Wind Or Down Wind Generator
What is the difference between an upwind and a downwind generator?
windOne point of confusion about wind turbines is the difference between a
DOWN-WIND wind turbine generator and an
UP-WIND wind turbine generator?
An Upwind turbine faces into the wind with the turbine blades in front of the
Nacelle* while a Downwind turbine has blades to the rear of the
Nacelle and faces away from the wind. Up-wind turbines are by far and away the most common, but down-wind turbines (usually two-bladed) are also used in certain situations.
Below are pictures of a Down-wind Turbine (left) and an Up-wind Turbine Generator (right):
In very strong winds the turbine blades of a wind turbine generator flex under enormous forces. With a down-wind turbine the blades flex AWAY from the mast which prevents them from crashing into it. Up-wind turbines need to be designed so that the blades are positioned at a good distance from the mast, and they must also be engineered to be inflexible (which costs more money). In addition, when the blades of a down-wind turbine bend it reduces the stresses on the mast as wind energy is lost in bending the blades. Finally, down-wind turbines do not need a tail (or motorised yaw mechanism) to align them with wind as the turbine blades perform this task (although this can also be a serious disadvantage in large down-wind turbines if wires carrying huge currents are getting twisted).
Down-wind turbines on the other hand are generally noisier (additional aerodynamic noise), and the blades are subject to more forces than those of up-wind turbines. Another serious disadvantage of a down-wind turbine is
wind shadow behind the mast causing a drop in power each time a blade passed behind the mast.
*Nacelle = is located at the top of the mast and contains the rotor and generator, and sometimes a gearbox. Basically it is everything except the turbine blades, tail, and mast.
Article Last Modified: 15:40, 12th Apr 2006
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