Abstract: 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.

Abstract: Rotor stage of an axial turbine comprising a plurality of vanes and a plurality of attenuators interposed between each pair of subsequent vanes, said attenuator impeding the rotation of the vane profiles caused by the centrifugal force during the operation and achieving a stiffening of the rotor vane array.