Intelligent Wind Turbine Generator with Tandem Rotors Applicable to Offshore Wind Farm(Flow Conditions around Tandem Rotors Equipped with Two Dimensional Blades)

摘要

The authors have proposed the superior wind turbine generator, whichis composed of the tandem wind rotors and the double rotationalarmature type generator without the conventional stator. The largesizedfront wind rotor and the small-sized rear wind rotor driverespectively the inner and the outer armatures of the generator, inkeeping the rotational torque counter-balanced. Such operatingconditions enable to make the output higher than the conventional windturbine and to keep the output constant in the rated operating modewithout using the brake and/or the pitch control mechanisms. In orderto get the best performance, the authors started preliminarily optimizingthe rotor profiles. This paper discussed experimentally the desirablearrangement between two-stage wind rotors and numerically the flowconditions around the wind rotors. The flow interaction between thefront and the rear wind rotors affects not only the flow conditions butalso the axial distance between both wind rotors giving the maximumoutput.