Axial turbine with two supply levels

An axial turbine (100) having two supply levels for the expansion phase of a working fluid in a steam thermodynamic cycle or in an organic S-Rankine cycle comprising a shaft (2), a plurality of rotor blade arrays (R1-Rn) and corresponding supporting disks (21, 22), a plurality of stator blades arrays (S1-Sn), further comprising a first inlet opening (5) and a first inlet volute (3), defined by a first casing (3′) for a first working fluid supply level and a second inlet opening (7′) and a second inlet volute (4), defined by a second casing (4′), this second casing (4′) being a second inner casing, for a second working fluid supply level, characterized in that:

• the second volute (4) is positioned inside the first volute (3),
• the working fluid of the second supply level reaches directly upstream of any stator blade (S2, S3 . . . Sn) after the first stage, and
• the flow of the first supply level and the flow of the second supply level are conveyed in two radially contiguous stators (S2A, S3A, . . . , SnA;
• S2B, S3B, . . . , SnB) upstream of a subsequent and common rotor blade (R2, R3 . . . Rn).