Intermediate casing for a compressor in a gas turbine engine and a gas turbine engine

1. An intermediate-casing structure for a compressor in a gas turbine engine, comprising: at least one static blade row for deflecting at least one airflow entering the intermediate-casing structure, a plurality of rings, on which the at least one static blade row is radially arranged,

at least one first component of the intermediate-casing structure formed from composite material or including composite material,

at least one second component of the intermediate-casing structure formed from metal or including metal, and

the plurality of rings including an outer ring, a middle ring and an inner ring arranged concentrically around a principal rotational axis of the gas turbine engine, wherein the at least one static blade row includes outer blades and inner blades extending radially between the outer, middle and inner rings.

2. The intermediate-casing structure according to claim 1 , and further comprising at least one stabilizing strut radially arranged between two of the plurality of rings that are arranged concentrically with one another.

3. The intermediate-casing structure according to claim 1 , wherein the at least one first component is exposed to lower mechanical loading in operation than the at least one second component.

4. The intermediate-casing Intermediate casing structure according to claim 1 , wherein the at least one first component experiences predominantly aerodynamic loading in operation.

5. The intermediate-casing structure according to claim 4 , wherein the at least one first component is configured as at least one chosen from the at least one a static blade row and the outer ring at an outer circumference of the intermediate-casing structure.

6. The intermediate-casing structure ng to claim 1 , wherein the at least one second component experiences predominantly mechanical loading from solid bodies during operation.

7. The intermediate-casing structure according to claim 6 , wherein the at least one second component is configured as at least one of the plurality of rings.

8. The intermediate-casing structure according to claim 7 , wherein the at least one second component comprises the inner ring, the middle ring and the outer ring.

9. The intermediate-casing structure according to claim 6 , wherein the at least one second component includes at least one fastening element on an outer side of the outer ring.

10. The intermediate-casing structure according to claim 2 , wherein the at least one second component includes the at least one stabilizing strut.

11. The intermediate-casing structure according to claim 10 , wherein the at least one stabilizing strut is formed integrally with at least one chosen from a fastening element and the middle ring.

12. The intermediate-casing structure according to claim 10 , wherein the at least one stabilizing strut has an aerodynamically active profile.

13. A gas turbine engine for an aircraft, comprising:

a core engine, which comprises a turbine, a compressor and a core shaft connecting the turbine to the compressor;

a fan, which is positioned upstream of the core engine, wherein the fan comprises a plurality of fan blades; and

a gearbox, which is driven by the core shaft, wherein the fan is driven by the gearbox at a lower speed than the core shaft, the intermediate-casing structure according to claim 1 .

14. The gas turbine engine according to claim 13 , configured as an aircraft engine.

15. The intermediate-casing structure according to claim 1 , wherein the at least one first component of the intermediate-casing structure is formed from fiber-composite material or includes fiber-composite material.