A darrieus turbine produces a low speed shaft power of 1650 kw at the rated speed of 22.1 r/min in a 14.3 m/s wind speed. (a) determine rated rotor torque from the values given for measured power and rated rotor speed. (b) if the rotor is started at this rated torque in 18 seconds, determine the rotor inertia. (c) if a constant torque clutch is used, how much energy is absorbed during the start cycle? (d) if the generator is rated at 1800 r/min, what is the input torque to the generator, assuming no losses in the gearbox?
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