Cmc component with cover plate

A method of controlling cooling air flow within a CMC component, the method comprising:

• providing a CMC component comprising:
• a base having a radial outer surface and a radial inner surface inward surface, the base comprising a plurality of ceramic fiber plies and a ceramic matrix, and
• at least one cooling cavity within the base that extends from the outer radial surface of the base into an interior region of the base, the at least one cooling cavity having a cavity opening at the outer radial surface of the base, and the at least one cooling cavity being defined by cavity side walls and a cavity bottom wall, and
• covering the cavity opening of the at least one cooling cavity with a cover plate, the cover plate comprising an edge region around the perimeter of the cover plate which is in contact with base of the CMC component, and a central recessed region which extends into the cooling cavity,
• wherein the central recessed region is defined by side walls and a bottom wall wherein each side wall of the central recessed region is spaced from a corresponding cavity side wall and the bottom wall of the central recessed region is spaced from the cavity bottom wall, and the central recessed region has a plurality of cooling air inlets to permit cooling air to flow from a region above the cover plate into the cooling cavity.

A turbine engine comprising:

• a fan section, a compressor section, a combustion chamber, and a turbine section, the turbine section including at least one rotor and one or more turbine blade(s) extending radially outwardly from the at least one rotor;
• and
• a blade outer air seal assembly positioned between the one or more turbine blade(s) and an outer casing to the engine;
• wherein the blade outer air seal assembly is formed of a plurality blade outer air seal segments, wherein each blade outer air seal segment comprises:
• a base having a radial outer surface and a radial inner surface inward surface, the base comprising a plurality of ceramic fiber plies and a ceramic matrix,
• at least one cooling cavity within the base that extends from the outer radial surface of the base into an interior region of the base, the at least one cooling cavity having a cavity opening at the outer radial surface of the base, and the at least one cooling cavity being defined by cavity side walls and a cavity bottom wall, and
• a cover plate covering the cavity opening of the at least one cooling cavity, the cover plate comprises an edge region around the perimeter of the cover plate which is in contact with base and a central recessed region which extends into the cooling cavity, the central recessed region is defined by side walls and a bottom wall wherein each side wall of the central recessed region is spaced from a corresponding cavity side wall and the bottom wall of the central recessed region is spaced from the cavity bottom wall, and the central recessed region has a plurality of cooling air inlets to permit cooling air to flow from a region above the cover plate into the cooling cavity.