Noise-reduced turbomachine

Patent metadata

Field	Value
Publication number	US-9574452-B2
Application number	US-201113704073-A
Country	US
Kind code	B2
Filing date	Jun 14, 2011
Priority date	Jun 14, 2010
Publication date	Feb 21, 2017
Grant date	Feb 21, 2017

Abstract

A turbomachine has an annular main flow duct through which passes a flow, and in which is arranged at least one stator provided with stator vanes. The stator vanes each have at least one recess issuing into a flow duct inside the stator vanes and the flow duct issues into a bypass duct of the turbomachine via at least one outflow duct provided with a shut-off element.

First claim

What is claimed is:

1. A turbomachine, comprising:
an annular main flow duct through which passes a flow;
a bypass duct positioned outside the main flow duct;
a stator having a plurality of stator vanes arranged in the main flow duct, the stator vanes each having a recess opening to the main flow duct;
a flow duct inside each stator vane, the recess issuing into the flow duct;
an outflow duct, connected to the bypass duct, the flow duct issuing into the bypass duct via the outflow duct;
a shut-off valve for shutting-off flow through the outflow duct;
wherein a pressure of the bypass duct at the connection to the outflow duct is less than a pressure of the main flow duct at the recess, creating a relative suction at the recess via the flow duct connecting to the outflow duct connecting to the bypass duct, thereby providing a flow through the recess from the main flow duct and issuing the suction flow into the bypass duct.

2. The turbomachine of claim 1 , wherein the stator is a guide vane.

3. The turbomachine of claim 2 , wherein the recess is a slot.

4. The turbomachine of claim 2 , wherein the recess is formed as a linear row of holes.

5. The turbomachine of claim 2 , wherein the recess is located on a suction side of the stator vane.

6. The turbomachine of claim 5 , wherein the recess is arranged adjacent to a stator profile trailing edge of the stator vane.

7. The turbomachine of claim 6 , wherein the recess extends substantially over an entire radial length of the stator vane.

8. The turbomachine of claim 7 , and further comprising a plurality of recesses arranged at at least one chosen from equal and varying spacing to one another.

9. The turbomachine of claim 8 , wherein the at least one outflow duct is connected to an annular duct extending in the circumferential direction relative to a machine axis, and the flow ducts issue into the annular duct .

10. The turbomachine of claim 9 , and further comprising a diffuser, the outflow duct issuing into the bypass duct via the diffuser.

11. The turbomachine of claim 10 , wherein the recess is dimensioned such that at least one chosen from an intensity and a circumferential extension of a wake flow flowing off at the profile trailing edge of the stator vane is reduced.

12. The turbomachine of claim 11 , and further comprising a control unit for opening the shut-off valve in noise-relevant operating states.

13. The turbomachine of claim 1 , wherein the recess is formed as a linear row of holes.

14. The turbomachine of claim 1 , wherein the recess is located on a suction side of the stator vane.

15. The turbomachine of claim 1 , wherein the recess is arranged adjacent to a stator profile trailing edge of the stator vane.

16. The turbomachine of claim 15 , wherein the recess extends substantially over an entire radial length of the stator vane.

17. The turbomachine of claim 16 , and further comprising a plurality of recesses arranged at at least one chosen from equal and varying spacing to one another.

18. A method for reducing noise of a turbomachine, comprising:
providing a turbomachine, comprising:
an annular main flow duct through which passes a flow;
a bypass duct positioned outside the main flow duct;
a stator having a plurality of stator vanes arranged in the main flow duct, the stator vanes each having a recess opening to the main flow duct;
a flow duct inside each stator vane, the recess issuing into the flow duct;
an outflow duct connected to the bypass duct, the flow duct issuing into the bypass duct via the outflow duct;
a shut-off valve for shutting-off flow through the outflow duct;

providing that a pressure of the bypass duct at the connection to the outflow duct is less than a pressure of the main flow duct at the recess, such that a relative suction is created at the recess via the flow duct connecting to the outflow duct connecting to the bypass duct;
drawing off a fluid flow via the recess of the stator vane using the relative suction at the recess to reduce an intensity of a wake flow flowing off at a profile trailing edge of the stator vane;
passing the fluid flow into a bypass duct of the turbomachine.

19. The method of claim 18 , and further comprising passing the fluid flow from the recess through at least one chosen from the flow duct and an annular duct fluidically connected to the flow duct.

Assignees

• Rose Marco
• Willer Lars
• Rolls Royce Deutschland Ltd & Co Kg

Inventors

• Rose Marco
• Willer Lars

Classifications

• F04D27/023

  Details or means for fluid extraction · CPC title

• F01D9/041 Primary

  using blades (F01D5/148 takes precedence) · CPC title

• F05D2240/122

  related to the trailing edge of a stator vane · CPC title

• F05D2240/304

  related to the trailing edge of a rotor blade · CPC title

• F05D2270/17

  to control boundary layer · CPC title