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The Betz limit is widely accepted to be the upper limit for the power coefficient of open wind turbines. However, when investigating the power performance of an offshore floating wind turbine in surge oscillations, it is found that the Betz limit can be exceeded by the instantaneous power coefficient if the tip speed ratio is near the optimal tip speed ratio and the platform surge motion is severe...
The power and thrust characteristics of an offshore floating wind turbine (OFWT) not only depend on the tip speed ratio λ and the blade pitch angle θ, but also closely relate to the platform motions. In this paper, the influences of the platform surge motion on the behaviors of the power output and rotor thrust of a typical Spar-type OFWT are investigated using Free Vortex Method (FVM). The influences...
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