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US 8,434,997 B2Granted
Gas turbine engine case for clearance control
AssigneeUnited Technologies Corporation
InventorsHector M. Pinero, George N. Peroulakis
Life of this patent
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Abstract
A gas turbine engine includes an active clearance control (ACC) system within the engine casing. The case includes a wall structure with a cast-in cooling configuration through Refractory Metal Core technology which is tailored to address traditional hot spots and improve discrete control of case growth.
Claims15
An active clearance control (ACC) system for a gas turbine engine comprising:
- an engine case provided by a wall with a wall thickness, and at least one internal cooling passage formed within the wall;
- and
- wherein the wall includes spaced apart inner and outer surfaces defining the wall thickness, and the wall includes a circumferential rib protruding from the outer surface radially outward as compared to axial adjacent outer surfaces, the internal cooling passage contained within the circumferential rib between the inner and outer surfaces.
A gas turbine engine comprising:
- an engine case having at least one internal cooling passage formed therein, said engine case having a wall with a wall thickness, said wall thickness being defined by spaced apart inner and outer surfaces,
- a shroud structure supported by said engine case;
- a rotor with a plurality of circumferentially spaced radially outwardly extending blades directly adjacent to said shroud structure to define a tip clearance, a cooling airflow communicated into said at least one internal cooling passage operable to change said tip clearance;
- and
- wherein the wall includes a circumferential rib protruding from the outer surface radially outward as compared to axial adjacent outer surfaces, the internal cooling passage contained within the circumferential rib between the inner and outer surfaces.
2 more elements
Dependencies are inferred from the claim text.