WIND TURBINE BLADE AND TURBINE ROTOR

摘要

Wind turbine rotors (12, 80, 90, 212) and wind turbine blades (20, 82, 92, 220) having the startup capability of a drag-type turbine and the increased tip speed of a lift-type turbine are provided. The rotor (12, 80, 90, 212) includes a plurality of elongated blades (20, 82, 92, 220), each of the blades having a first portion (32, 232) mounted to a mast (26, 84, 94, 216) at a first radial distance from the mast and a second portion (34, 234) mounted to the mast at a second radial distance from the mast, less than the first radial distance. Each blade (20, 220) includes a first chord length (66) and a second chord length (68), and may include a third chord length (70) between the first and second chord length. The blades (20, 220) may be substantially straight or helical.