Method and apparatus of asymmetric injection at the subsonic portion of a nozzle flow

A small area expansion nozzle to vector the exhaust flow from a jet engine, comprising:

• an opening for accepting the exhaust flow;
• a converging portion of the nozzle wherein the exhaust flow is subsonic velocity;
• 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;
• and
• at lease 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.

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;
• and
• at 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;
• and
• varying an effective throat of the nozzle.