| 11. | To counter this, the rotor speed is not allowed to increase above a certain value.
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| 12. | A wind turbine with a variable rotor speed is called a variable speed wind turbine.
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| 13. | This means that the axial and tangential forces that act on the blade vary with rotor speed.
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| 14. | The apparent wind speed is influenced by both the free-stream velocity of the air, and the rotor speed.
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| 15. | The mixed phases are rapidly accelerated to rotor speed and separation begins as the liquids are displaced upward.
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| 16. | However, the rotor speed is variable.
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| 17. | A variable stroke would match the rotor speed according to wind speed, functioning like a " variable-speed generator ".
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| 18. | That is, as the wind speed varies, the rotor speed varies, and so the frequency of the Voltage varies.
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| 19. | The rotor was accelerated in no-lift pitch until the rotor speed required for flight was achieved, and then declutched.
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| 20. | An equilibrium rotor speed is established between driving and retarding forces, which is an unambiguous measure of the dynamic viscosity.
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