A fluid-flow machine includes at least one rotor having a rotary element with a plurality of rotor blades arranged on the rotary element, and a circumferential casing having a central axis and surrounding the rotor. The circumferential casing or a part connected thereto has an annular space surface
A fluid-flow machine includes at least one rotor having a rotary element with a plurality of rotor blades arranged on the rotary element, and a circumferential casing having a central axis and surrounding the rotor. The circumferential casing or a part connected thereto has an annular space surface on the inside, which delimits a flow duct of the fluid-flow machine radially outwards. The annular space surface has a structuring at least in one area adjoining a rotor on the circumferential side. At least one structuring of the annular space surface has, relative to the central axis of the circumferential casing, a circumferentially asymmetrical design.
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1. A fluid-flow machine, comprising: at least one rotor having a rotary element with a plurality of rotor blades arranged on the rotary element, anda circumferential casing having a central axis and surrounding the rotor,at least one of the circumferential casing or a component connected thereto hav
1. A fluid-flow machine, comprising: at least one rotor having a rotary element with a plurality of rotor blades arranged on the rotary element, anda circumferential casing having a central axis and surrounding the rotor,at least one of the circumferential casing or a component connected thereto having an internal annular space surface which radially outwardly delimits a flow duct of the fluid-flow machine,the annular space surface having a structuring in at least one area adjacent the rotor having a circumferential asymmetry relative to the central axis, andwherein the annular space surface includes at least one interruption section extending in a circumferential direction, the interruption section providing the circumferential asymmetry and being formed by a recess, the annular space surface having exactly one recess or the annular space surface having a plurality of recesses provided circumferentially asymmetrically in the annular space surface;wherein an axial extent of the recess is larger than an entire axial extent of a blade row of the at least one rotor to extend both upstream and downstream of the entire axial extent of the blade row. 2. The fluid-flow machine of claim 1, wherein the annular space surface is smooth along a circumference thereof not occupied by the interruption section. 3. The fluid-flow machine of claim 1, wherein the annular space surface also includes at least one symmetrical structuring in the circumferential direction. 4. The fluid-flow machine of claim 1, wherein the recess has at least one radius which differs from a radius of the annular space surface along a circumference thereof not occupied by the interruption section, with reference to the central axis. 5. The fluid-flow machine of claim 1, wherein the annular space surface has exactly one recess. 6. The fluid-flow machine of claim 5, wherein the annular space surface has a plurality of recesses, which are provided circumferentially asymmetrically in the annular space surface. 7. The fluid-flow machine of claim 5, wherein the recess in a section in a plane perpendicular to the central axis has at least one of a bent or rectangular shape. 8. The fluid-flow machine of claim 1, wherein the circumferential casing includes the annular space surface. 9. The fluid-flow machine of claim 1, and further comprising a liner connected internally to the circumferential casing, the liner including the annular space surface. 10. The fluid-flow machine of claim 1, wherein the annular space surface is provided in an area of a blade cascade of a rotor. 11. The fluid-flow machine of claim 10, wherein the annular space surface is also provided in axial areas of at least one of the circumferential casing or a part connected thereto, the axial areas being located at least one of ahead of or behind an adjacent blade cascade. 12. The fluid-flow machine of claim 1, wherein the fluid-flow machine is a compressor of a jet engine. 13. The fluid-flow machine of claim 1, wherein the recess includes a plurality of circumferentially extending and same shaped parallel grooves. 14. The fluid-flow machine of claim 13, wherein the recess has a constant axial length and a constant circumferential length. 15. A fluid-flow machine, comprising: at least one rotor having a rotary element with a plurality of rotor blades arranged on the rotary element, anda circumferential casing having a central axis and surrounding the rotor,at least one of the circumferential casing or a component connected thereto having an internal annular surface which radially outwardly delimits a flow duct of the fluid-flow machine,the annular surface adjacent the rotor having a circumferential asymmetry relative to the central axis by having a first circumferential section having a surface structuring and a second circumferential section having a substantially smooth surface, wherein the surface structuring includes at least one interruption section extending in a circumferential direction, the interruption section providing the circumferential asymmetry and being formed by a recess, the surface structuring having exactly one recess or the surface structuring having a plurality of recesses provided circumferentially asymmetrically in the annular surface;wherein an axial extent of the recess is larger than an entire axial extent of a blade row of the at least one rotor to extend both upstream and downstream of the entire axial extent of the blade row. 16. The fluid-flow machine of claim 15, wherein the surface structuring has exactly one recess. 17. The fluid-flow machine of claim 15, wherein the surface structuring has a plurality of recesses, which are provided circumferentially asymmetrically in the annular space surface. 18. The fluid-flow machine of claim 15, wherein the recess includes a plurality of circumferentially extending and same shaped parallel grooves. 19. The fluid-flow machine of claim 18, wherein the recess has a constant axial length and a constant circumferential length.
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이 특허에 인용된 특허 (23)
Barry Brian (Duffield GB2) Freeman Christopher (Farnsfield GB2), Aerodynamic damping of vibrations in rotor blades.
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