초록 ▼

Air is bled from the compressor of a gas turbine engine and it is led to holes in the shanks of turbine blades, so as to cool the interiors of the blades during operation of the engine. Some of the air leaks radially outwards, to seal the gas annulus against hot gas leaks onto the face of the turbin

Air is bled from the compressor of a gas turbine engine and it is led to holes in the shanks of turbine blades, so as to cool the interiors of the blades during operation of the engine. Some of the air leaks radially outwards, to seal the gas annulus against hot gas leaks onto the face of the turbine disc. A reduced flow of cooling air is enabled at conditions other than engine full throttle. This however, starves the gas sealing air. The invention provides a back up supply, by putting the air through a plenum chamber and dividing it so that when cooling airflow is reduced, a further sealing air flow is provided in compensation therefore.

대표청구항 ▼

A gas turbine engine including a casing, a turbine stage comprising a disc having an upstream face and a rim and blades having shanks, a pair of annular lands adapted for co-rotation with said turbine stage, a pair of annular grooves in said casing for receipt of said annular lands, a first annular

A gas turbine engine including a casing, a turbine stage comprising a disc having an upstream face and a rim and blades having shanks, a pair of annular lands adapted for co-rotation with said turbine stage, a pair of annular grooves in said casing for receipt of said annular lands, a first annular space to which cooling air is passed from between said lands, a further annular space radially outwardly of said first annular space, a plenum chamber for receipt of pressurized air, a pair of ducts communicating with said plenum chamber and with respective annular spaces and valve means in each duct and adapted for simultaneous operation to reduce flow of pressurized air in one duct and increase flow of pressurized air in the other duct.