Hot gas path component trailing edge having near wall cooling features

Patent metadata

Field	Value
Publication number	US-9970302-B2
Application number	US-201514739944-A
Country	US
Kind code	B2
Filing date	Jun 15, 2015
Priority date	Jun 15, 2015
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

A hot gas path component includes a substrate having an outer surface and an inner surface. The inner surface defines an interior space. The outer surface defines a pressure side surface and a suction side surface. The pressure and suction side surfaces are joined together at a leading edge and at a trailing edge. A first cooling passage is formed in the suction side surface of the substrate. It is coupled in flow communication to the interior space. A second cooling passage, separate from the first cooling passage, is formed in the pressure side surface. The second cooling passage is coupled in flow communication to the interior space. A cover is disposed over at least a portion of the first and second cooling passages. The interior space channels a cooling fluid to the first and second cooling passages, which channel the cooling fluid therethrough to remove heat from the component.

First claim

What is claimed is:

1. A hot gas path component comprising:
a substrate comprising an outer surface and an inner surface, said inner surface defining a first interior space, said outer surface defining a pressure side surface and a suction side surface, said pressure and suction side surfaces being joined together at a leading edge and at a trailing edge of said hot gas path component, said substrate comprising a trailing edge portion;
a first cooling passage formed in said suction side surface of said trailing edge portion of said substrate and coupled in flow communication to said first interior space, said first cooling passage comprising a first end and a second end;
a second cooling passage separate from said first cooling passage and formed in said pressure side surface of said trailing edge portion of said substrate, said second cooling passage coupled in flow communication to said first interior space, said second cooling passage comprising a first end and a second end;
a cover disposed over at least a portion of said first and second cooling passages, said cover defined by one of a braze sheet and a pre-sintered preform;
a bond coat formed over said cover;
a thermal barrier coating formed over said bond coat; and
an outlet passage defined in said substrate and offset from said outer surface of said pressure side and said outer surface of said suction side, said outlet passage coupled to said second ends of said first and second cooling passages and extending through said trailing edge of said substrate,
wherein said first interior space is configured to channel a cooling fluid to said first and second cooling passages, and
wherein said first and second cooling passages are configured to channel the cooling fluid therethrough to said outlet passage to transfer heat away from said cover and said substrate.

2. The hot gas path component in accordance with claim 1 further comprising a first inlet passage coupled in flow communication to said first interior space and at least one of said first cooling passage and said second cooling passage.

3. The hot gas path component in accordance with claim 2 , wherein said first inlet passage is coupled in flow communication to said first interior space and said first end of said first cooling passage, said hot gas path component further comprising a second inlet passage coupled in flow communication to said first interior space and said first end of said second cooling passage.

4. The hot gas path component in accordance with claim 1 , wherein said substrate further comprises a recess formed in at least one of said pressure side surface and said suction side surface, said recess comprising at least one recess edge defining said second end of at least one of said first cooling passage and said second cooling passage.

5. The hot gas path component in accordance with claim 4 , wherein said cover is disposed in said recess such that at least one edge of said cover abuts said recess edge.

6. The hot gas path component in accordance with claim 1 , wherein each of said first and second cooling passages comprise a plurality of outlet passages formed through said cover and coupled in fluid communication with said first and second cooling passages, respectively.

7. The hot gas path component in accordance with claim 1 , wherein said first and second cooling passages are coupled in flow communication to each other at said second ends.

8. The hot gas path component in accordance with claim 1 , wherein said inner surface of said substrate further comprises a second interior space separate from said first interior space, said hot gas path component further comprising an outlet passage coupled in flow communication to said second interior space and said second ends of said first and second cooling passages.

9. The hot gas path component in accordance with claim 1 further comprising an outlet passage coupled in flow communication with one of said first cooling passage and said second cooling passage, said outlet passage formed through one of said pressure side surface and said suction side surface at said trailing edge.

10. The hot gas path component in accordance with claim 9 further comprising a cross flow passage coupled between said first cooling passage and said second cooling passage at said second ends, respectively, said cross flow passage configured to enable the cooling fluid to flow through each of said first and second cooling passages and exit through said outlet passage.

11. A gas turbine engine comprising:
a compressor;
a turbine coupled to said compressor; and
a hot gas path component disposed in said turbine, said hot gas path component comprising:
a substrate comprising an outer surface and an inner surface, said inner surface defining a first interior space, said outer surface defining a pressure side surface and a suction side surface, said pressure and suction side surfaces being joined together at a leading edge and at a trailing edge of said hot gas path component, said substrate comprising a trailing edge portion, wherein said substrate further comprises a recess formed therein, said recess comprising a bottom surface and at least one recess edge;
a first cooling passage formed in said suction side surface of said trailing edge portion of said substrate and coupled in flow communication to said first interior space, said first cooling passage comprising a first end and a second end;
a second cooling passage separate from said first cooling passage and formed in said pressure side surface of said trailing edge portion of said substrate, said second cooling passage coupled in flow communication to said first interior space, said second cooling passage comprising a first end and a second end, wherein at least one of said first and second cooling passages extend at least partially along said bottom surface of said recess, and wherein said second end of at least one of said first cooling passage and said second cooling passage is defined by said at least one recess edge, said at least one recess edge extending over and defining a depth of said recess; and
a cover comprising a first surface, an opposite second surface, and a thickness defined therebetween, said first surface disposed along said bottom surface of said recess over at least a portion of said first and second cooling passages, said thickness being equal to said depth of said recess;

wherein said first interior space is configured to channel a cooling fluid to said first and second cooling passages, and
wherein said first and second cooling passages are configured to channel the cooling fluid therethrough to transfer heat away from said cover and said substrate.

12. The gas turbine engine in accordance with claim 11 further comprising a casing comprising a cooling fluid supply conduit.

13. The gas turbine engine in accordance with claim 12 , wherein said cooling fluid supply conduit is coupled in fluid communication to said first interior space.

14. The gas turbine engine in accordance with claim 11 , wherein said hot gas path component further comprises a coating disposed along at least a portion of said outer surface of said substrate, wherein said coating extends over at least a portion of said cover.

15. The gas turbine engine in accordance with claim 11 further comprising a first inlet passage coupled in flow communication to said first interior space and at least one of said first cooling passage and said second cooling passage.

16. The gas turbine engine in accordance with claim 11 , wherein said cover is disposed in said recess such that at least one edge of said cove

Assignees

• Gen Electric

Inventors

• Lacy Benjamin Paul
• Kottilingam Srikanth Chandrudu
• Miranda Carlos Miguel
• Itzel Gary Michael

Classifications

• F01D5/187 Primary

  Convection cooling · CPC title

• F05D2220/32

  in gas turbines · CPC title

• Y02T50/672

  Cross-Sectional Technologies · mapped topic

• F05D2260/204

  by the use of microcircuits · CPC title

• F01D9/041

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