Power plants – Reaction motor – Method of operation
Patent
1997-08-05
2000-09-05
Kim, Ted
Power plants
Reaction motor
Method of operation
60231, 60230, 60271, 23926519, 23926517, F02K 130, F02K 128
Patent
active
061125121
ABSTRACT:
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.
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AIAA 95-2603; Conceptual Development of Fixed-Geometry Nozzles Using Fluidic Injection for Throat Area Control; D.N. Miller, et al; Jul. 10, 1995; pp. 1-10.
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Catt Jeffrey Alan
Miller Daniel Nicholas
Kim Ted
Lockheed Martin Corporation
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