초록 ▼

An apparatus and method for varying the effective cross sectional area of an opening through a fixed geometry nozzle provides a fluidic cross flow with an injector incorporated in the throat of the nozzle 68 proximate to the subsonic portion of the flow through the nozzle. One or more injectors 76 a

An apparatus and method for varying the effective cross sectional area of an opening through a fixed geometry nozzle provides a fluidic cross flow with an injector incorporated in the throat of the nozzle 68 proximate to the subsonic portion of the flow through the nozzle. One or more injectors 76 are directed at an injector angle opposed to the subsonic portion of the flow. The opposed cross flow from injector 76 interacts with a primary flow 14 through the nozzle 68 to partially block the nozzle's opening 72, thereby effectively decreasing the cross sectional area of opening 72 in a jet engine 42. A plurality of cross flows proximate to a nozzle's throat 70 permits effective afterburner 64 operations even with a fixed geometry nozzle by allowing throttling of the primary flow 14. Further, variations in the cross flow's mass flow characteristics or injection angle can allow vectoring of the primary flow 14.

대표청구항 ▼

[ What is claimed is:] [23.] A method for vectoring a primary flow through a small area expansion ratio nozzle, comprising the steps of:directing the primary flow through a physical throat of the nozzle wherein the nozzle comprises:an opening for accepting a primary flow through the nozzle;a smooth

[ What is claimed is:] [23.] A method for vectoring a primary flow through a small area expansion ratio nozzle, comprising the steps of:directing the primary flow through a physical throat of the nozzle wherein the nozzle comprises:an opening for accepting a primary flow through the nozzle;a smooth convergent portion of the nozzle wherein said primary flow is subsonic;a physical throat coupling said converging portion to a diverging portion of the nozzle downstream of said physical throat;at least one primary injector located proximate to said physical throat wherein said at least one primary injector is oriented at an angle to oppose said primary flow; andat least one supplemental injector, wherein said at least one supplemental injector is located in the nozzle downstream of said at least one primary injector, wherein said at least one supplemental injector is oriented at an angle to oppose said primary flow and wherein said at least one primary and supplemental injectors provide a pulsed cross flow field opposed to said subsonic primary flow in order to vary an effective throat within the nozzle;directing a pulsed cross flow at the subsonic portion of the primary flow, wherein said pulsed cross flow opposes the primary flow; andvarying an effective throat of the nozzle.