초록

Apparatus for supplying pressurized cooling air to the turbine blades (20) of a gas turbine engine is disclosed. Multiple nozzles (38 and 40) of a tangential on-board injection system for pressurizing the cooling air are staged to provide variable rates of cooling airflow to the blades.

대표청구항 ▼

In a gas turbine engine of the type having coolable rotor blades and having means for the supply of cooling air to such blades including tangential on-board injectors fixed to the stator assembly of the engine between a source of cooling air and the engine rotor assembly for directing cooling flow a

In a gas turbine engine of the type having coolable rotor blades and having means for the supply of cooling air to such blades including tangential on-board injectors fixed to the stator assembly of the engine between a source of cooling air and the engine rotor assembly for directing cooling flow against the rotor assembly in the direction of rotation of the rotor assembly and passages internally of the rotor assembly for directing flow subsequently to the rotor blades, wherein the improvement comprises means for varying the amount of cooling air to the rotor blade, including; a first plurality of said injectors spaced circumferentially about the engine and capable of discharging cooling air to a cavity at the downstream ends thereof, a second plurality of said injectors spaced circumferentially about the engine and capable of discharging cooling air to said cavity at the downstream ends of the first plurality of injectors, and means for restricting the flow of cooling air to said second injectors at engine operating conditions requiring less than maximum cooling flow.