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A fluid flow machine includes at least one casing 1 and at least one rotor drum 3 rotatable about a machine axis 4, with stator vanes 8 and rotor blades 7 being arranged in an annulus duct 2 formed between the casing 1 and the rotor drum 3 The annulus duct 2 is divided into an outer annular duct 5 a

A fluid flow machine includes at least one casing 1 and at least one rotor drum 3 rotatable about a machine axis 4, with stator vanes 8 and rotor blades 7 being arranged in an annulus duct 2 formed between the casing 1 and the rotor drum 3 The annulus duct 2 is divided into an outer annular duct 5 and an inner annular duct 6 by at least one annular flow divider 11, in each of which rotor blades 7 and stator vanes 8 are arranged Outer rotor blades 7a, which are arranged in the outer annular duct 5, are rotatable at a different speed than the inner rotor blades 7b, which are arranged in the inner annular duct 6.

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1. A fluid flow machine, comprising: at least one casing;at least one rotor drum rotatable about a machine axis;an annulus duct formed between the casing and the rotor drum;at least one annular flow divider dividing the annulus duct into an outer annular duct and an inner annular duct;a plurality of

1. A fluid flow machine, comprising: at least one casing;at least one rotor drum rotatable about a machine axis;an annulus duct formed between the casing and the rotor drum;at least one annular flow divider dividing the annulus duct into an outer annular duct and an inner annular duct;a plurality of outer rotor blades positioned in the outer annular duct and a plurality of inner rotor blades positioned in the inner annular duct, wherein, the outer rotor blades positioned in the outer annular duct are rotatable at a different speed than the inner rotor blades positioned in the inner annular duct;wherein the inner and outer rotor blades partly overlap in an axial direction. 2. The fluid flow machine of claim 1, and further comprising a gearbox coupling the outer rotor blades arranged in the outer annular duct and the inner rotor blades arranged in the inner annular duct such that a single drive shaft can drive the outer and the inner rotor blades at different speeds. 3. The fluid flow machine of claim 2, wherein, a ratio between the different speeds of the outer rotor blades and the inner rotor blades corresponds to a ratio of a mean exit radii of the rotor blade rows formed by the outer rotor blades and the inner rotor blades. 4. The fluid flow machine of claim 3, wherein at least one of the annular ducts in an area upstream of a rotor blade includes an expanding cross-sectional area in the direction of flow. 5. The fluid flow machine of claim 4, wherein the wherein the inner and outer rotor blades completely overlap in an axial direction. 6. The fluid flow machine of claim 3, wherein adjacently arranged rotor blade rows of the rotor blades at least partly overlap in a radial direction to such an extent, that a leading edge hub radius of the radially outward rotor is smaller than a leading edge blade tip radius of the radially inward rotor. 7. The fluid flow machine of claim 3, wherein one of the outer rotor blades or the inner rotor blades are attached to the rotor drum, and the rotor drum forms the annular flow divider, outwardly enclosing the inner rotor blade, the rotor drum being flown by fluid, on both a radially outer side and a radially inner side thereof. 8. The fluid flow machine of claim 3, wherein at least two rotor blade rows arranged in different annular ducts have a same direction of rotation. 9. The fluid flow machine of claim 3, wherein at least two rotor blade rows arranged in different annular ducts have an opposite direction of rotation. 10. The fluid flow machine of claim 1, and further comprising a first drive shaft for driving the outer rotor blades arranged in the outer annular duct and a second drive shaft for driving the inner rotor blades arranged in the inner annular duct. 11. The fluid flow machine of claim 10, wherein, a ratio between the different speeds of the outer rotor blades and the inner rotor blades corresponds to a ratio of a mean exit radii of the rotor blade rows formed by the outer rotor blades and the inner rotor blades. 12. The fluid flow machine of claim 11, wherein at least one of the annular ducts in an area upstream of a rotor blade includes an expanding cross-sectional area in the direction of flow. 13. The fluid flow machine of claim 12, wherein the wherein the inner and outer rotor blades completely overlap in an axial direction. 14. The fluid flow machine of claim 11, wherein adjacently arranged rotor blade rows of the rotor blades at least partly overlap in a radial direction to such an extent, that a leading edge hub radius of the radially outward rotor is smaller than a leading edge blade tip radius of the radially inward rotor. 15. The fluid flow machine of claim 11, wherein one of the outer rotor blades or the inner rotor blades are attached to the rotor drum, and the rotor drum forms the annular flow divider, outwardly enclosing the inner rotor blades, the rotor drum being flown by fluid, on both a radially outer side and a radially inner side thereof. 16. The fluid flow machine of claim 11, wherein at least two rotor blade rows arranged in different annular ducts have a same direction of rotation. 17. The fluid flow machine of claim 11, wherein at least two rotor blade rows arranged in different annular ducts have an opposite direction of rotation.