AIRFOILS

• US 20160298470A1
• Filed: 04/08/2015
• Published: 10/13/2016
• Est. Priority Date: 04/08/2015
• Status: Active Grant

• Current Assignee: Rtx Corporation
• Original Assignee: United Technologies Corporation (Raytheon Technologies Corporation d/b/a RTX)
• Inventors: Fukuda, Takao, Hartmann, Scott D.
• Granted Patent: US 10,641,113 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F01D 5/141 Shape, i.e. outer, aerodynamic form F01D5/148 - F01D5/20 take precedence; blade construction F01D5/147
• CPC Class Codes: F01D 9/02 Nozzles; Nozzle boxes; Stator blades; Guide conduits , e.g. individual nozzles nozzle boxes F01D9/047
• CPC Class Codes: F01D 9/041 using blades F01D5/148 takes precedence
• CPC Class Codes: F05D 2230/21 by casting
• CPC Class Codes: F05D 2240/122 related to the trailing edge of a stator vane
• CPC Class Codes: F05D 2240/123 related to the pressure side of a stator vane
• CPC Class Codes: F05D 2240/129 Cascades, i.e. assemblies of similar profiles acting in parallel
• CPC Class Codes: F05D 2250/713 inflexed
• CPC Class Codes: F05D 2250/74 given by a set or table of xyz-coordinates
• CPC Class Codes: Y02T 50/60 Efficient propulsion technologies, e.g. for aircraft

Abstract

An airfoil cluster includes an inner diameter platform and an outer diameter platform. A plurality of airfoils extend radially from the inner diameter platform to the outer diameter platform. Each airfoil has a leading edge and a trailing edge, and pressure and suction sides between the leading and trailing edges. At least one of the airfoils includes a recessed portion on the pressure side adjacent to the trailing edge.

Claims

1. An airfoil cluster comprising:

an inner diameter platform;

an outer diameter platform; and

a plurality of airfoils extending radially from the inner diameter platform to the outer diameter platform, each airfoil having a leading edge and a trailing edge, and pressure and suction sides between the leading and trailing edges, wherein at least one of the airfoils includes a recessed portion on the pressure side adjacent to the trailing edge.

2. The airfoil cluster as recited in claim 1, wherein the recessed portion includes a recessed surface, wherein the trailing edge is an arcuate surface connecting between the suction side and the recessed surface of the pressure side, wherein the recessed surface is tangent to the arcuate surface of the trailing edge.

3. The airfoil cluster as recited in claim 1, wherein the pressure side includes a substantially flat non-recessed surface and a substantially flat recessed surface with a transition surface therebetween, wherein both of the substantially flat surfaces are proximate to the trailing edge, and wherein the substantially flat recessed surface is part of the recessed portion and is at an angle with respect to the substantially flat non-recessed surface.

4. The airfoil cluster as recited in claim 1, wherein the plurality of airfoils includes three hollow vanes.

5. The airfoil cluster as recited in claim 1, wherein the plurality of airfoils ranges from two to six hollow vanes.

6. The airfoil cluster as recited in claim 1, wherein an exterior surface of at least one of the airfoils is formed in substantial conformance with a set of Cartesian coordinates set forth in one of Table 1, Table 2 or Table 3, wherein the Cartesian coordinates are provided by an axial coordinate scaled by a local chord length, a circumferential coordinate scaled by the local chord length, and a span location, wherein the local chord length corresponds to a respective width of each airfoil between the leading and trailing edges at 50% span.

7. A method for adjusting flow area between airfoils in a cluster:

manufacturing an airfoil cluster including;

an inner diameter platform;

an outer diameter platform; and

a plurality of airfoils extending radially from the inner diameter platform to the outer diameter platform, each airfoil having a leading edge and a trailing edge, and pressure and suction sides between the leading and trailing edges, wherein manufacturing the airfoil cluster includes generating a recessed portion on the pressure side of at least one of the airfoils adjacent to the trailing edge to adjust a throat distance between at least two of the airfoils.

8. The method as recited in claim 7, wherein the recessed portion includes a recessed surface, wherein trailing edge is an arcuate surface connecting between the suction side and the recessed surface of the pressure side, wherein generating the recessed portion includes generating the recessed surface of each airfoil tangent to the respective arcuate surface of the trailing edge of each airfoil.

9. The method as recited in claim 7, wherein generating the recessed portion includes generating a substantially flat recessed surface at an angle with respect to a substantially flat non-recessed surface with a transition surface therebetween, wherein the substantially flat non-recessed surface, the substantially flat recessed surface and the transition surface are defined in the pressure side proximate to the trailing edge, and wherein the substantially flat recessed surface is part of the recessed portion.

10. The method as recited in claim 7, wherein manufacturing an airfoil cluster includes generating an exterior surface of at least one of the airfoils in substantial conformance with a set of Cartesian coordinates set forth in at least one of Table 1, Table 2 or Table 3, wherein the Cartesian coordinates are provided by an axial coordinate scaled by a local chord length, a circumferential coordinate scaled by the local chord length, and a span location, wherein the local chord length corresponds to a respective width of each airfoil between the leading and trailing edges at 50% span.

11. The method as recited in claim 7, wherein generating the recessed portion includes at least one of casting or machining.

12. An airfoil comprising:

an airfoil body having a leading edge and a trailing edge with an exterior surface therebetween, wherein the exterior surface includes a recessed portion on a pressure side of the airfoil adjacent to the trailing edge.

13. The airfoil as recited in claim 12, wherein the exterior surface is formed in substantial conformance with a set of Cartesian coordinates set forth in at least one of Table 1, Table 2 or Table 3, wherein the Cartesian coordinates are provided by an axial coordinate scaled by a local chord length, a circumferential coordinate scaled by the local chord length, and a span location, wherein the local chord length corresponds to a respective width of each airfoil between the leading and trailing edges at 50% span.

14. The airfoil as recited in claim 13, wherein substantial conformance with the set of Cartesian coordinates set forth in Tables 1, 2 and 3 includes values within ±

15% of each coordinate.

15. The airfoil as recited in claim 13, wherein a manufacturing tolerance relative to the set of Cartesian coordinates is ±

3.6% of the local chord length of the airfoil body.

16. The airfoil as recited in claim 12, wherein the recessed portion includes a recessed surface, wherein the trailing edge is an arcuate surface connecting between the suction side and the recessed surface of the pressure side, wherein the recessed surface is tangent to the arcuate surface of the trailing edge.

17. The airfoil as recited in claim 12, wherein the pressure side includes a substantially flat non-recessed surface and a substantially flat recessed surface with a transition surface therebetween, wherein both of the substantially flat surfaces are proximate to the trailing edge, and wherein the substantially flat recessed surface is part of the recessed portion and is at an angle with respect to the substantially flat non-recessed surface.

18. The airfoil as recited in claim 12, wherein the airfoil body is a hollow vane.