BOAS with multi-metering diffusion cooling
AssigneeFlorida Turbine Technologies, Inc.
InventorGeorge Liang
Life of this patent
Estimating the term…
Abstract
A blade outer air seal used in a gas turbine engine, the BOAS including a metering plate with metering holes and an impingement plate with impingement holes, the metering plate and impingement plate forming a plurality of separate diffusion cavities forming a grid. A porous metallic plate is bonded to the underside of the impingement plate and has a plurality of cooling channels extending from the leading edge to the trailing edge of the BOAS. Cooling air from the blade ring carrier is metered through the metering holes and into the diffusion cavities, and then passes through a plurality of impingement holes and into a cooling channel, to be discharged out the trailing edge side of the BOAS. Inter-segment cooling holes also pass cooling air out to the sides of the BOAS.
Claims20
A blade outer air seal for use in a gas turbine engine, the blade outer air seal comprising:
- a plurality of diffusion cavities each having a metering hole in fluid communication with a cooling air supply;
- an impingement hole plate having a plurality of impingement holes in fluid communication with the diffusion cavities;
- a porous metallic plate having a plurality of cooling channels formed therein;
- and,
- a thermal barrier coating applied to the outer surface of the porous metallic plate;
- wherein cooling air passes through the metering holes and into the diffusion cavities, and then through at least one of the impingement holes and into the cooling channel to provide cooling to the blade outer air seal.
A gas turbine engine having a turbine section with at least one stage of rotor blades, each blade having a blade tip that forms a gap with a blade outer air seal secured to a stationary casing, the blade outer air seal comprising:
- a metering cover plate having a plurality of metering holes therein;
- an impingement and stiffener rib plate having a plurality of impingement holes therein;
- the metering cover plate and the impingement and stiffener plate forming a plurality of diffusion cavities;
- a porous metallic plate having a plurality of cooling channels, the porous metallic plate being secured to the impingement plate such that the impingement holes are aligned with the cooling channels;
- and,
- a TBC applied on the porous metallic plate on the side opposite to the cooling channels.
A process for cooling a blade outer air seal used in a gas turbine engine, the process comprising the steps of:
- supplying compressed cooling air to a blade ring carrier of the engine;
- metering the cooling air into a plurality of separate diffusion cavities formed within the blade out air seal;
- impinging cooling from the diffusion cavities into cooling channels extending along the blade outer air seal;
- and,
- discharging the cooling air from the cooling channels out the trailing edge side of the blade outer air seal.
Dependencies are inferred from the claim text.