Passive exhaust suppressor and method

A passive exhaust suppressor, comprising:

• an array of at least three ducts, each duct comprising:
• a primary nozzle;
• and
• a directing surface positioned at the exit of said primary nozzle to effect exhaust exiting the primary nozzle to attach to a convex side of said directing surface;
• and
• a shroud, positioned around the array of ducts to create an inlet adjacent to said primary nozzles and an exit plane above said directing surfaces.

A passive exhaust suppressor, comprising:

• an array of at least three ducts, each duct comprising:
• a primary nozzle;
• and
• a secondary nozzle positioned at the exit of said primary nozzle to permit the induction of cooling air into the secondary nozzle, wherein said array defines at least one interior duct to provide a lower pressure at the interior of an exit plane of said array than the pressure provided by exterior ducts at the exterior of the exit plane of the array for stabilizing an exhaust plume exiting said secondary nozzles and wherein the cooling air is colder than the exhaust of the exhaust plume;
• and
• a shroud, positioned around the array of ducts to create an inlet adjacent to said primary nozzles and an exit plane above said secondary nozzles.

A method of passively suppressing exhaust, comprising the steps of:

• passing exhaust through a primary nozzle;
• passing exhaust from the primary nozzle through a secondary nozzle at an exit of the primary nozzle;
• causing exhaust exiting the primary nozzle to attach to a side of the secondary nozzle;
• and
• inducing a flow of cooling air along the outside of the primary nozzle and into the secondary nozzle by the flow of exhaust passing through the primary and secondary nozzles.