Thermal Management Of Cmc Articles Having Film Holes

Abstract: Engine components are provided for gas turbine engines (10) that generate a hot combustion gas flow. The engine component can include a substrate (82) constructed from a CMC material and having a hot surface (84) facing the hot combustion gas flow and a cooling surface (86) facing a cooling fluid flow. The substrate (82) generally defines a film hole (90) extending through the substrate (82) and having an inlet (92) provided on the cooling surface (86), an outlet (94) provided on the hot surface (84), and a passage (96) connecting the inlet (92) and the outlet (94). The engine component can also include a coating on at least a portion of the hot surface (84) and on at least a portion of an inner surface defined within the passage (96).

Patent Information

Application #

Filing Date

30 November 2016

Publication Number

22/2017

Publication Type

INA

Invention Field

MECHANICAL ENGINEERING

Status

Email

bpo.mail@ge.com

Parent Application

Applicants

GENERAL ELECTRIC COMPANY

1 River Road, Schenectady, New York 12345, United States of America

Inventors

1. BUNKER, Ronald Scott

9075 Centre Pointe Drive, West Chester, OH 45069, USA

2. FELDMANN, Kevin Robert

1 Neumann Way, Cincinnati, OH 45215, USA

3. GROVES II, Robert Charles

1 Neumann Way, Cincinnati, OH 45215, USA

Specification

WE CLAIM:
1. An engine component for a gas turbine engine (10) generating hot combustion gas flow, comprising:
a substrate constructed from a CMC material and having a hot surface (84) facing the hot combustion gas flow and a cooling surface (86) facing a cooling fluid flow, wherein the substrate (82) defines a film hole (90) extending through the substrate (82) and having an inlet (92) provided on the cooling surface (86), an outlet (94) provided on the hot surface (84), and a passage connecting the inlet (92) and the outlet (94); and
a coating on at least a portion of the hot surface (84) and on at least a portion of an inner surface defined within the passage.
2. The engine component as claimed in claim 1, wherein the CMC material has a first thermal conductivity, and wherein the coating has a second thermal conductivity, and further wherein the first thermal conductivity is 10 times greater than the second thermal conductivity or more.
3. The engine component as claimed in claim 1, wherein the coating is on at least a portion of the hot surface (84), on at least a portion of an inner surface defined within the passage, and on at least a portion of the cold surface.
4. The engine component as claimed in claim 1, wherein the coating perimetrically surrounds the hot surface (84) around the outlet (94) defined in the hot surface (84).
5. The engine component as claimed in claim 4, wherein the coating extends across the entire hot surface (84) of the substrate (82).
6. The engine component as claimed in claim 1, wherein the coating has a thickness defined from an external surface (85) of the coating to the hot
15