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 turbom
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.
대표청구항▼
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
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.
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