Bend-twist Coupling on Rotor Blades for Wind Turbines
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Scientists at DLR and Fraunhofer IWES have developed a rotor blade with a bend twist coupling rotor blade that turns out of the wind independently when strong loads occurs. This passive measure eases loads on the rotor blades and the entire turbine.
Load-optimized Rotor Blades
Wind energy industry trends are moving towards wind energy plants with longer rotor blades to increase energy yield, especially onshore. However, larger rotor blades mean larger loads for the wind turbine to withstand, this while needing to preserve weight as low as possible. The strongest structural loading conditions usually happen under gust loads. One way of reducing these induced loads is to use the Bend-Twist Coupling (BTC) effect, where rotor blades independently position themselves optimally towards the wind to minimize loads.
This approach was realized in a rotor blade design and was one of the results of the SmartBlades1 project , which ran between 2012 and 2016. The project also examined two additional...
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