Apparatus to admix by-pass air with exhaust gases in a by-pass gas-turbine engine

Claim 1

APPARATUS TO ADMIX COMPRESSED AIR WITH EXHAUST GASES COMPRISING AN ANNULAR WALL STRUCTURE DEFINING WITH IN IT AN EXHAUST GAS RECEIVING DUCT, OUTER WALL MEANS EXTERNALLY OF SAID WALL STRUCTURE AND COOPERATING THEREWITH TO DEFINE A COMPRESSED AIR PASSAGE, SAID WALL STRUCTURE HAVING IN IT A SERIES OF CIRCUMFERENTIALLY SPACED HOLES OPEN TO THE COMPRESSED AIR PASSAGE, AND A SERIES OF STUB PIPES ON THE INTERIOR OF SAID WALL STRUCTURE AND PROJECTING A SHORT DISTANCE RADIALLY AND AXIALLY IN A DOWNSTREAM DIRECTION INTO THE EXHAUST GAS DUCT, SAID STUB PIPES COMMUNICATING THROUGH SAID HOLES WITH COMPRESSED AIR PASSAGE AND BEING OPEN AT THEIR RADIALLY INNER ENDS TO THE EXHAUST GAS DUCT, THE PLANE OF EACH OF SAID LAST MENTIONED OPENINGS FORMING AN ACUTE ANGLE WITH RESPECT TO THE AXIS OF SAID EXHAUST GAS DUCT, WHEREBY AIR ENTERING SAID EXHAUST GAS DUCT THROUGH SAID STUB PIPES HAS A SUBSTANTIAL RADIAL COMPONENT OF VELOCITY.