WALL OF TURBO MACHINE AND TURBO MACHINE

• US 20100172749A1
• Filed: 03/28/2008
• Published: 07/08/2010
• Est. Priority Date: 03/29/2007
• Status: Active Grant

• Current Assignee: IHI Corporation, The Society of Japanese Aerospace Companies
• Original Assignee: IHI Corporation, The Society of Japanese Aerospace Companies
• Inventors: Mitsuhashi, Katsunori, Yamawaki, Ruriko, Takahashi, Akira, Hamazaki, Hiroshi
• Granted Patent: US 9,051,840 B2
• Time in Patent Office: Days
• US Class Current: 415/193
• CPC Class Codes: F01D 5/143 Contour of the outer or inner working fluid flow path wall, i.e. shroud or hub contour
• CPC Class Codes: F05D 2240/11 Shroud seal segments
• CPC Class Codes: F05D 2240/80 Platforms for stationary or moving blades
• CPC Class Codes: F05D 2250/184 sinusoidal
• CPC Class Codes: F05D 2250/611 undulated
• CPC Class Codes: F05D 2250/711 convex
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

The invention relates to wall of a turbo machine having a cascade of blades. The wall includes: a first platform facing a first passage between blades in the cascade of blades; and a second platform facing a second passage between adjacent cascade of blades on an upstream side and cascade of blades on a downstream side, and having a circumferential outline having a distribution of radial positions. According to the invention, loss due to disturbance of flow through the gap of axially adjacent walls can be reduced.

Claims

1. A wall of a turbo machine having a cascade of blades including:

a first platform facing a first passage between blades in the cascade of blades; and

a second platform facing a second passage between another adjacent cascade of blades on an upstream side and said cascade of blades on a downstream side, and having a circumferential outline having a distribution of radial positions.

2. A wall of a turbo machine according to claim 1, wherein said distribution of radial positions has periodicity, with one period corresponding to one pitch of said blades.

3. A wall of a turbo machine according to claim 1, wherein the circumferential outline of said second platform has a minimum radius position near the circumferential center between said blades.

4. A wall of a turbo machine according to claim 3, wherein said minimum radius position is on a front surface side or a rear surface side of said blades with respect to the circumferential center between said blades.

5. A wall of a turbo machine according to claim 1, wherein the circumferential outline of said second platform includes;

a convex portion adjacent to a front surface of said blades, and a convex portion adjacent to a rear surface of said blades.

6. A wall of a turbo machine according to claim 1, wherein a depression corresponding to said circumferential outline, and extending along at least the axial direction of said cascade of blades is provided in said second platform.

7. A wall of a turbo machine according to claim 6, wherein said depression reaches to the axial outer edge in said second platform.

10. A turbo machine including;

a stator blade,

a rotor blade,

a wall on a root side of said stator blade,

a wall on a tip side of said stator blade,

a wall on a root side of said rotor blade, and

a wall on a tip side of said rotor blade,

and at least one of said walls has a wall according to claim 1.

11. A turbo machine including:

a stator blade,

a rotor blade,

a wall on a root side of said stator blade,

a wall on a tip side of said stator blade,

a wall on a root side of said rotor blade,

a wall on a tip side of said rotor blade, and

a wall located between a root and tip of said stator blade or said rotor blade,

and at least one of said walls has a wall according to claim 1.

8. A wall of a turbo machine having a cascade of blades including:

a first platform having a first radial face arranged between a leading edge and a trailing edge of the blades in the cascade of blades; and

a second platform having a second radial face arranged between said blades of said cascade of blades and blades of another adjacent cascade of blades on an upstream side, and that cooperates with said first radial face of said first platform, and in which a circumferential shape of said second radial face has a distribution of radial positions.

9. A wall of a turbo machine according to claim 8, wherein said second platform further has an outside face that cooperates with said second radial face, and faces in the axial direction.

12. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall root side of said stator blade,

a fourth wall on a root side of said rotor blade, and

an extension provided on said second wall, and extending from a leading edge of said rotor blade towards a first clearance space between adjacent first wall and second wall, and having a radial depression.

16. A turbo machine according to claim 12 having one depression component for each blade pitch.

17. A turbo machine according to claim 12, wherein a part of said depression component faces said first clearance space or said second clearance space.

18. A turbo machine according to claim 16, wherein a part of said depression component faces said first clearance space or said second clearance space.

13. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall root side of said stator blade,

a fourth wall on a root side of said rotor blade, and

an extension provided on said fourth wall, and extending from a leading edge of said rotor blade towards a second clearance space between adjacent third wall and fourth wall, and having a radial depression.

14. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall root side of said stator blade,

a fourth wall on a root side of said rotor blade, and

an extension provided on said first wall, and extending from a leading edge of said stator blade towards a first clearance space between adjacent first wall and second wall, and having a radial depression.

15. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall root side of said stator blade,

a fourth wall on a root side of said rotor blade, and

an extension provided on said third wall, and extending from a leading edge of said stator blade towards a second clearance space between adjacent third wall and fourth wall, and having a radial depression.

19. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall on a root side of said stator blade,

a fourth wall on a root side of said rotor blade; and

an extension provided on said second wall, and extending from a leading edge of said rotor blade towards a first clearance space between adjacent first wall and second wall, and having a depression that suppresses loss of flow between said first clearance space and a passage between blades.

20. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall on a root side of said stator blade,

a fourth wall on a root side of said rotor blade; and

an extension provided on said fourth wall, and extending from a leading edge of said rotor blade towards a second clearance space between adjacent third wall and fourth wall, and having a depression that suppresses loss of flow between said second clearance space and a passage between blades.

21. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall on a root side of said stator blade,

a fourth wall on a root side of said rotor blade; and

an extension provided on said first wall, and extending from a leading edge of said stator blade towards a first clearance space between adjacent first wall and second wall, and having a depression that suppresses loss of flow between said first clearance space and a passage between blades.

22. A turbo machine including;

a stator blade,

a rotor blade,

a first wall on a tip side of said stator blade,

a second wall on a tip side of said rotor blade,

a third wall on a root side of said stator blade,

a fourth wall on a root side of said rotor blade; and

an extension provided on said third wall, and extending from a leading edge of said stator blade towards a second clearance space between adjacent third wall and fourth wall, and having a depression that suppresses loss of flow between said second clearance space and a passage between blades.