The question of the maximum wind kinetic energy that can be utilized by a wind turbine is of fundamental importance for employment of wind energy. Up to now, an answer to this question was obtained only for the case of an infinite number of turbine-rotor blades in the framework of application of the one-dimensional theory of an ideal loaded disk without loss for friction and turbulence taken into account. This implies that the maximum energy that can be extracted from the wind kinetic energy, or the power coefficient, for an ideal wind turbine does not exceed 59%. For a long time, this result was known as the Betz limit [1], (A. Betz was a pupil of L. Prandtl and then headed his laboratory).
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