EXHAUST NOZZLE APPARATUS AND METHOD FOR MULTI STREAM AIRCRAFT ENGINE

摘要

A multi stream aircraft fixed geometry nozzle includes an inner nozzle, an outer nozzle, and a supersonic ejector. The outer nozzle is configured to channel a third stream from an aft end of a third stream duct surrounding a bypass duct of a multi stream aircraft engine to the supersonic ejector to merge the third stream with the primary stream. The fixed geometry nozzle is configured to operate between an SFC mode and a thrust mode such that, when the inner nozzle accelerates the primary stream supersonically to the supersonic ejector, at which the primary stream is merged with the third stream, in the SFC mode the total pressure of the primary stream is substantially the same as the total pressure of the third stream, and in the thrust mode the total pressure of the primary stream is substantially greater than the total pressure of the third stream.

主权项

1. A multi stream aircraft fixed geometry nozzle comprising an inner nozzle;
an outer nozzle disposed radially outward of the inner nozzle; and a supersonic ejector disposed axially aft of the inner nozzle and outer nozzle; the inner nozzle being configured to channel a primary stream of a mixture of a propulsive core stream from an engine core and a bypass stream from a bypass duct surrounding the engine core, from an aft end of the engine core to the supersonic ejector; and the outer nozzle being configured to channel a third stream from an aft end of a third stream duct surrounding the bypass duct to the supersonic ejector to merge the third stream with the primary stream; the fixed geometry nozzle being configured to operate between an SFC mode and a thrust mode such that, when the inner nozzle accelerates the primary stream supersonically to the supersonic ejector, at which the primary stream is merged with the third stream, in the SFC mode the total pressure of the primary stream is substantially the same as the total pressure of the third stream, and in the thrust mode the total pressure of the primary stream is substantially greater than the total pressure of the third stream.