ROTOR STAGE OF AXIAL TURBINE WITH IMPROVED CHORD/PITCH RATIO

摘要

Rotor stage of an axial turbine comprising a shaft, adapted to rotate around an axis, and a plurality of blades, having at least one airfoil portion, which extends in a substantially radial direction normal to the axis, at a first radial distance from the axis, being arranged a number of airfoil portions lower than the number of airfoil portions arranged at a second radial distance from the axis, the first radial distance being smaller than the second radial distance, said rotor stage comprising a plurality of bearing blades, and a plurality of additional blade, said bearing blades comprising a first and a second rest element said additional blade being connected to said two subsequent bearing blades.

主权项

1. Rotor stage of an axial turbine comprising a shaft, adapted to rotate around an axis, and a plurality of blades, having at least one blade, which extends in a substantially radial direction normal to the axis, at a first radial distance from the axis, being arranged a number of airfoil portions lower than the number of airfoil portions which are arranged at a second radial distance from the axis, the first radial distance being smaller than the second radial distance, said rotor stage comprising a plurality of bearing blades, each of which comprises a root adapted to constrain the bearing blade to the shaft, a blade tip and an airfoil portion, having a suction side and a pressure side and extending from the top of the root to the blade tip in a substantially radial direction, said rotor stage comprising a plurality of additional blades, each of which comprises a blade tip, a base, an airfoil portion, extending from the base to the blade tip in a substantially radial direction, and a foot extending from the base in a substantially tangential direction normal to the axis and to the radial direction, said bearing blades comprising a first and second rest element extending from the suction and the pressure sides of the airfoil portion, respectively, in a substantially tangential direction, said foot being adapted to constrain to the rest elements of two subsequent bearing blades, to connect the additional blade to said two subsequent bearing blades.