Fluid-flow machine

Patent metadata

Field	Value
Publication number	US-9816528-B2
Application number	US-201213451657-A
Country	US
Kind code	B2
Filing date	Apr 20, 2012
Priority date	Apr 20, 2011
Publication date	Nov 14, 2017
Grant date	Nov 14, 2017

Abstract

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.

First claim

What is claimed is:

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, and
a 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, and
wherein 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, and
a 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.

Assignees

• Johann Erik
• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Johann Erik

Classifications

• F04D29/661 Primary

  especially adapted for elastic fluid pumps · CPC title

• F04D29/526

  Details of the casing section radially opposing blade tips (ducts F04D29/545) · CPC title

• F01D25/06

  for preventing blade vibration (means on blade-carrying members or blades F01D5/00) · CPC title

• F04D29/164

  of an axial flow wheel · CPC title

• F01D11/08

  for sealing space between rotor blade tips and stator (specially-shaped blade tips therefor F01D5/20) · CPC title