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Embodiments of the invention relate generally to rotor cooling and, more particularly, to a stator member having at least one passage for the delivery of cooling steam to a bucket root. In one embodiment, the invention provides a turbine comprising: a rotor including a first bucket root; and a stato

Embodiments of the invention relate generally to rotor cooling and, more particularly, to a stator member having at least one passage for the delivery of cooling steam to a bucket root. In one embodiment, the invention provides a turbine comprising: a rotor including a first bucket root; and a stator member having: a rotor bore within which at least a portion of the rotor is disposed; a facing end adjacent to the first bucket root of the rotor; a plurality of seals within the rotor bore for sealing against the rotor, the plurality of seals including a first seal nearest the facing end and a second seal adjacent to the first seal; and a plurality of passages, each extending from a surface of the rotor bore at a point between the first seal and the second seal and extending through the facing end.

대표청구항 ▼

1. A turbine comprising: a rotor including a first bucket root; anda stator member having: a rotor bore within which at least a portion of the rotor is disposed;a facing end adjacent to the first bucket root of the rotor;a plurality of seals within the rotor bore for sealing against the rotor, the p

1. A turbine comprising: a rotor including a first bucket root; anda stator member having: a rotor bore within which at least a portion of the rotor is disposed;a facing end adjacent to the first bucket root of the rotor;a plurality of seals within the rotor bore for sealing against the rotor, the plurality of seals including a first seal nearest the facing end and a second seal adjacent to the first seal; anda plurality of passages, each passage extending from a surface of the rotor bore at a point between the first seal and the second seal and extending through the facing end. 2. The turbine of claim 1, wherein the first seal is selected from a group consisting of: a brush seal and a packing ring. 3. The turbine of claim 2, wherein the first seal is a packing ring and the second seal is a packing ring. 4. The turbine of claim 1, further comprising an inducer plate attached to the facing end, the inducer plate including a plurality of passages extending from a first surface adjacent to the facing end through to a second surface substantially parallel to the first surface, wherein at least one of the plurality of passages of the inducer plate is in communication with one of the plurality of passages of the stator member. 5. The turbine of claim 4, wherein the at least one of the plurality of passages of the inducer plate is angled in a direction of rotation of the rotor. 6. The turbine of claim 4, wherein the at least one of the plurality of passages of the inducer plate is angled within the inducer plate at between about 45 degrees and about 90 degrees. 7. The turbine of claim 6, wherein the at least one of the plurality of passages of the inducer plate is angled within the inducer plate at between about 60 degrees and about 85 degrees. 8. The turbine of claim 7, wherein the at least one of the plurality of passages of the inducer plate is angled within the inducer plate at an angle of about 80 degrees. 9. The turbine of claim 1, wherein, in an operative state, a quantity of steam is diverted from between the first seal and the second seal, through the plurality of passages of the stator member, and into a wheel space cavity between the facing end and the first bucket root. 10. The turbine of claim 9, wherein the plurality of passages of the stator member impart onto the quantity of steam a swirl ratio greater than about 1.6. 11. The turbine of claim 10, wherein the swirl ration is between about 1.7 and about 2. 12. The turbine of claim 9, wherein the quantity of steam has a first pressure at the point between the first seal and the second seal that is at least 50 psi greater than a second pressure within the wheel space cavity. 13. The turbine of claim 12, wherein the first pressure is about 80 psi greater than the second pressure. 14. A stator member for a turbine, the stator member comprising: an elongate body;a rotor bore within and along a longitudinal axis of the elongate body;at least one passage having a first opening on a surface of the rotor bore and extending through the elongate body to a second opening on a facing end of the elongate body, the facing end lying along a plane substantially perpendicular to the longitudinal axis of the elongate body; anda first recess along the surface of the rotor bore for containing a sealing device, the first recess being disposed between the facing end and the first opening of the at least one passage. 15. The stator member of claim 14, further comprising a second recess along the surface of the rotor bore for containing a second sealing device, the second recess being disposed adjacent the first opening of the at least one passage, opposite the first recess. 16. The stator member of claim 14, further comprising an inducer plate affixed to the facing end, the inducer plate including at least one passage extending from a first surface adjacent the facing end through to a second surface substantially parallel to the first surface, the at least one passage being in communication with the at least one passage of the stator member. 17. The stator member of claim 16, wherein the at least one passage of the inducer plate is angled within the inducer plate at between about 45 degrees and about 90 degrees. 18. The stator member of claim 17, wherein the at least one passage of the inducer plate is angled within the inducer plate at between about 60 degrees and about 85 degrees. 19. The stator member of claim 18, wherein the at least one passage of the inducer plate is angled within the inducer plate at about 80 degrees. 20. The stator member of claim 16, wherein the at least one passage of the inducer plate is angled in a direction of rotation of the rotor.