US 4,072,008 AGranted

Variable area bypass injector system

AssigneeGeneral Electric Company

InventorsIvan E. Kenworth, Ivan E. Woltmann

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Abstract

An augmented mixed flow gas turbine engine is provided with a variable area bypass injector system which varies the area through which the bypass stream is injected into the core stream and which also selectively obtrudes cooling airflow to the augmentor liner. The ability to vary the area through which the bypass stream is injected into the core stream permits the mixed flow gas turbine engine of this invention to operate efficiently over a wide range of bypass ratios and further permits the total pressure of the bypass stream to be maintained at a level which will keep the engine inlet airflow matched to an optimum design level throughout a wide range of engine thrust settings. The ability to selectively obtrude cooling flow to the augmentor liner allows the augmentor cooling flow to be optimized for development of engine thrust during the augmented and non-augmented modes of operation and thereby further improve the operating range and efficiency of the engine of this invention.

Claims11

Dependent claims

An improved gas turbine engine of the type having an inlet for supplying a gas flow to a core engine, duct means for bypassing a portion of the inlet gas flow around the core engine, a mixer for injecting the bypass stream into the core engine exhaust stream, an augmentor for receiving the mixed streams and directing them to an exhaust nozzle and an annular passage circumscribing the augmentor to provide cooling flow thereto wherein the improvement comprises:

a Variable Area Bypass Injector (VABI) including means for varying the cross-sectional area through which the bypass stream is injected into the core engine exhaust stream whereby the static pressure of the bypass stream may be matched to the static pressure of the core engine exhaust stream prior to mixing the two streams and further including means for selectively obtruding cooling flow to the augmentor, and
wherein said means for selectively obtruding cooling flow to the augmentor is formed as a structural part of, and moves concurrently with, the means for varying the cross-sectional area through which the bypass stream is injected into the core engine exhaust stream.

Dependencies are inferred from the claim text.