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Recirculation structure for turbocompressors, having a ring chamber which is arranged in the area of the free blade ends of a blade ring largely upstream of the latter and adjoins the main flow duct. A plurality of guiding elements are arranged in the ring chamber distributed over its circumference

Recirculation structure for turbocompressors, having a ring chamber which is arranged in the area of the free blade ends of a blade ring largely upstream of the latter and adjoins the main flow duct. A plurality of guiding elements are arranged in the ring chamber distributed over its circumference and are arranged and shaped in a fluidically advantageous manner with respect to the recirculation flow, with recesses provided in the leading and/or trailing area of the ring chamber. The side of the ring chamber which adjoins the contour of the main flow duct is open along its axial length as well as along its entire circumference, the free edges of the guiding elements being situated on the or close to the contour of the main flow duct.

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1. Recirculation structure for a turbocompressor which has a compressor axis, an annular main flow duct surrounding the compressor axis, and a blade ring in the main flow duct, said recirculation structure comprising:a ring chamber radially adjoining the main flow duct and opening to the main flow d

1. Recirculation structure for a turbocompressor which has a compressor axis, an annular main flow duct surrounding the compressor axis, and a blade ring in the main flow duct, said recirculation structure comprising:a ring chamber radially adjoining the main flow duct and opening to the main flow duct along an axial extent of the ring chamber and with axial ends of the ring chamber aligned with walls of the main flow duct, and a plurality of air guiding elements disposed in the ring chamber and configured to form a recirculation flow with air from the main flow duct entering the ring chamber at an axially downstream part of the ring chamber and exiting the ring chamber at an axially upstream part of the ring chamber with a defined swirl, said ring chamber being provided with an open axially extending recess at at least one axial end of said air guiding elements for accommodating air flow in a circumferential direction of the ring chamber, wherein an axial center of the ring chamber is disposed upstream of free radial ends of blades of the blade ring, and wherein said ring chamber is radially open to the main flow duct along substantially the entirety of the circumferential and axial extent of the ring chamber, and wherein free radial ends of the air guiding elements are substantially aligned with contours of the walls of the main flow duct which adjoin the ring chamber. 2. Recirculation structure according to claim 1, wherein said ring chamber is formed at a fixed casing of the main flow duct, andwherein said blade ring is rotatable with respect to the fixed casing. 3. Recirculation structure according to claim 1, wherein said ring chamber is formed at a rotatable hub, andwherein said blade ring is a fixed stator ring. 4. Recirculation structure according to claim 1, wherein said ring chamber is disposed in use in a single stage turbocompressor.5. Recirculation structure according to claim 1, wherein said ring chamber is disposed in use in a multi-stage turbocompressor.6. Recirculation structure according to claim 1, wherein said ring chamber is disposed in one of an axial, diagonal or radial turbocompressor.7. Recirculation structure according to claim 1, wherein an axially leading wall and an axially trailing wall of the ring chamber, starting from its edges on the contour of the main flow duct, are sloped by a similar angle upstream diagonally toward a front of the ring chamber.8. Recirculation structure according to claim 1, wherein an axially leading wall and an axially trailing wall of the ring chamber, starting from its edges on the contour of the main flow duct, are sloped by different angles upstream diagonally toward a front of the ring chamber.9. Recirculation structure according to claim 7, wherein the angle of slope α of the axially leading and the axially trailing wall of the ring chamber, starting from the radial direction, has a value in the range of from 30° to 60°.10. Recirculation structure according to claim 8, wherein the angle of slope α of the axially leading and the axially trailing wall of the ring chamber, starting from the radial direction, has a value in the range of from 30° to 60°.11. Recirculation structure according to claim 1, wherein the air guiding elements are constructed in a metal-sheet-type manner to be flat or curved, of a constant thickness, or, in a blade-type manner, to be spatially curved, of a varying thickness and with defined sections.12. Recirculation structure according to claim 1, wherein, in an axial viewing direction, the air guiding elements are arranged radially, sloped in the circumferential direction, or curved in the circumferential direction, in the case of a slope or a curvature, the angles β being selected such that the entry of the recirculation flow into the ring chamber is fluidically facilitated, that is, takes place in a fluidically advantageous manner.13. Recirculation structure according to claim 1, wherein the ratio of the total flow volume to the total volume of the guiding elements within the recirculation structure is selected to be maximal with the air guiding elements having a construction which is as thin-walled or thinly profiled as possible.14. Recirculation structure according to claim 1, in which the guiding elements extend axially into an area of the free blade ends,wherein the free edges of the guiding elements, at least in the area of the free blade ends are radially set back so far that, in the normal operation of the turbocompressor, no contact takes place between the blade ends and the guiding elements. 15. Recirculation structure according to claim 1, wherein the guiding elements consist of metal, such as steel or of an Ni or a Co base alloy, a light metal, such as Al, or a plastic material, such as thermoplastics, duroplastics or elastomers.16. Recirculation structure according to claim 15, wherein the free edges of the guiding elements in the case of light metal or plastic extend into the area of the free blade ends and a contact is possible.17. Aircraft engine, comprising a turbocompressor with at least one recirculation structure according to claim 1.18. Industrial gas turbine, comprising a turbocompressor with at least one recirculation structure according to claim 1.19. A recirculation structure for turbocompressors, having an annular chamber arranged concentrically with a compressor axis in the area of free blade ends of a blade ring, the annular chamber radially adjoining a contour of a main flow duct, a side of the annular chamber adjoining the contour of the main flow duct being open to the main flow duct over its axial length and over its entire periphery, and having a plurality of guide elements, which are arranged in the annular chamber distributed over the periphery thereof, and which are arranged and shaped in a manner favorable to the inlet of recirculation flow in an axially rear area of the annular chamber and in such a way that the outlet of the recirculation flow in an axially front area of the annular chamber occurs with a defined direction and where appropriate a defined swirl in relation to the downstream blade ring, the guide elements in at least one of the front area and the rear area of the annular chamber having recesses for the passage of a flow in the peripheral direction, wherein free edges of the guide elements over their axial length lie on or close to the contour of the main flow duct, and wherein the axial center of the annular chamber lies upstream of the axial center of the free blade ends.20. Recirculation structure according to claim 19, wherein said annular chamber is formed at a fixed casing of the main flow duct, andwherein said blade ring is rotatable with respect to the fixed casing. 21. Recirculation structure according to claim 19, wherein said ring chamber is formed at a rotatable hub, andwherein said blade ring is a fixed stator ring. 22. Recirculation structure according to claim 19, wherein said annular chamber is disposed in use in a single stage turbocompressor.23. Recirculation structure according to claim 19, wherein said annular chamber is disposed in use in a multi-stage turbocompressor.24. Recirculation structure according to claim 19, wherein said annular chamber is disposed in one of an axial, diagonal or radial turbocompressor.25. Recirculation structure according to claim 19, wherein an axially leading wall and an axially trailing wall of the annular chamber, starting from its edges on the contour of the main flow duct, are sloped by a similar angle upstream diagonally toward a front of the ring chamber.26. Recirculation structure according to claim 19 wherein an axially leading wall and an axially trailing wall of the ring chamber, starting from its edges on the contour of the main flow duct, are sloped by different angles upstream diagonally toward a front of the annular chamber.27. Recirculation structure according to claim 25, wherein the angle of slope α of the axially leading and the axially trailing wall of the annular chamber, starting from the radial direction, has a value in the range of from 30° to 60°.28. Recirculation structure according to claim 26, wherein the angle of slope α of the axially leading and the axially trailing wall of the annular chamber, starting from the radial direction, has a value in the range of from 30° to 60°.29. Recirculation structure according to claim 19, wherein the air guiding elements are constructed in a metal-sheet-type manner to be flat or curved, of a constant thickness, or, in a blade-type manner, to be spatially curved, of a varying thickness and with defined sections.30. Recirculation structure according to claim 19, wherein, in an axial viewing direction, the air guiding elements are arranged radially, sloped in the circumferential direction, or curved in the circumferential direction, in the case of a slope or a curvature, the angles β being selected such that the entry of the recirculation flow into the annular chamber is fluidically facilitated, that is, takes place in a fluidically advantageous manner.31. Recirculation structure according to claim 19, wherein the ratio of the total flow volume to the total volume of the guiding elements within the recirculation structure is selected to be maximal with the air guiding elements having a construction which is as thin-walled or thinly profiled as possible.32. Recirculation structure according to claim 19, in which the guiding elements extend axially into an area of the free blade ends,wherein the free edges of the guiding elements, at least in the area of the free blade ends are radially set back so far that, in the normal operation of the turbocompressor, no contact takes place between the blade ends and the guiding elements. 33. Recirculation structure according to claim 19, wherein the guiding elements consists of metal, such as steel or of an Ni or a Co base alloy, a light metal, such as Al, or a plastic material, such as thermoplastics, duroplastics or elastomers.34. Recirculation structure according to claim 33, wherein the free edges of the guiding elements in the case of light metal or plastic extend into the area of the free blade ends and a contact is possible.35. Aircraft engine, comprising a turbocompressor with at least one recirculation structure according to claim 19.36. Industrial gas turbine, comprising a turbocompressor with at least one recirculation structure according to claim 19.