VARIABLE SLOT BYPASS INJECTOR SYSTEM

Abstract

An afterburning, gas turbine aircraft engine with an annular duct for carrying bypass airflow is provided with a sliding valve type of rear Variable Area Bypass Injector (VABI) system. This rear VABI varies the direction and volume of the flow of bypass air into separate regions at an afterburning section of the engine. The system includes a sliding valve mounted in the bypass duct that is translated axially to open and close slots leading to core engine exhaust flow in the afterburning section. The unique structure of the injector system enables the axial translation of this sliding valve to simultaneously control bypass airflow into: first, a mixer just upstream of the afterburning section; second, a plurality of slots leading to the afterburning section; and third, an exhaust nozzle cooling liner that is cooled with the remaining portion of the bypass air. The system is actuated with a mechanical design that uses both rotation and translation to simplify the actuation motion so that one actuator can translate the valve. Because the system employs a valve that translates over a plurality of slots, it is commonly referred to as a variable slot bypass injector.

Source: Google Patents

35 USC §181 Secrecy Order

Inventor

• 1JOHN W. VDOVIAK

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