EJECTOR BASED EXTERNAL BLEED SYSTEM FOR A GAS TURBINE ENGINE

摘要

A method and system for providing a cooling flow from a compressor to a turbine in a gas turbine engine. First, second and third cooling air flows are provided from the compressor through respective ejectors as external bleed air flows to stages of the turbine. A first ejector combines a first bleed air flow extracted from the compressor with a lower pressure air flow extracted from the compressor to form the first cooling air flow. A second ejector combines a second bleed air flow extracted from the compressor with a secondary portion extracted from the first bleed air flow to form the second cooling air flow. A third ejector combines a third bleed air flow extracted from the compressor with a secondary portion extracted from the second bleed air flow to form the third cooling air flow.

主权项

1. A method of providing a cooling flow from a compressor to a turbine in a gas turbine engine, the method comprising the steps of:
providing a first cooling air flow from the compressor, through a first ejector, to a stage of the turbine; providing a second cooling air flow from the compressor, through a second ejector, to another stage of the turbine; wherein:
the first ejector combines a first bleed air flow extracted from the compressor with a lower pressure air flow extracted from the compressor to form the first cooling air flow; andthe second ejector combines a second bleed air flow extracted from the compressor with a secondary portion extracted from the first bleed air flow to form the second cooling air flow.