초록 ▼

An apparatus and method for varying the effective cross sectional area of an opening through a nozzle provides a controller 78 that pulses a fluidic cross flow through an injector associated with the nozzle 68 proximate to the opening of the nozzle. The controller 78 directs the injector 76 to provi

An apparatus and method for varying the effective cross sectional area of an opening through a nozzle provides a controller 78 that pulses a fluidic cross flow through an injector associated with the nozzle 68 proximate to the opening of the nozzle. The controller 78 directs the injector 76 to provide a pulsed cross flow having a predetermined frequency, amplitude, or wave form. The pulsed cross flow 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 pulsed 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 orientation pulse frequency, amplitude or wave form, or the cross flow's mass flow characteristics can allow vectoring of the primary flow 14.

대표청구항 ▼

[ What is claimed is:] [47.] A method for controlling a primary flow through a small area expansion ratio nozzle by varying an effective throat of the nozzle, comprising the steps of:directing a primary flow through the nozzle wherein the primary flow has a subsonic region prior to the effective thr

[ What is claimed is:] [47.] A method for controlling a primary flow through a small area expansion ratio nozzle by varying an effective throat of the nozzle, comprising the steps of:directing a primary flow through the nozzle wherein the primary flow has a subsonic region prior to the effective throat; anddirecting a pulsed cross flow opposed to the primary flow of the nozzle to vary an effective size, location, and orientation of the effective throat, wherein said pulsed cross flow is injected to oppose the primary flow from at least one primary injector located proximate to a real throat of the nozzle and at least one supplemental injector location downstream of said at least one primary injector.