Aspirating swirl type nozzle

Claim 1

AN ASPIRATING NOZZLE COMPRISING AN ENCLOSED SWIRL CHAMBER HAVING A SUBSTANTIALLY CIRCULAR CROSS SECTION, A NOZZLE AXIAL DISCHARGE OPENING AT THE FORWARD END OF SAID SWIRL CHAMBER THE NARROWEST PORTION OF WHICH CONSTITUTES A DISCHARGE ORIFICE, SWIRLING MEANS AT THE REAR OF SAID SWIRL CHAMBER, A TUBULAR DUCT EXTENDING AXIALLY FROM THE REAR OF SAID SWIRL CHAMBER AND TERMINATING WITH A TUBULAR DUCT AXIAL OPENING AT AN INTERMEDIATE AXIAL POSITION IN SAID SWIRL CHAMBER BETWEEN SAID SWIRLING MEANS AND SAID DISCHARGE ORIFICE, THE DIAMETER OF SAID DISCHARGE ORIFICE BEING LARGER THAN THE INTERNAL DIAMETER OF SAID TUBULAR DUCT, THE OUTER SURFACE OF SAID TUBULAR DUCT HAVING CYLINDRICAL CONFIGURATION OVER SUBSTANTIALLY ITS ENTIER LENGTH, SAID NOZZLE BEING FREE OF MEANS FOR IMPARTING SWIRLING TO A FLUID FLOWING WITHIN SAID TUBULAR DUCT, SAID SWIRL CHAMBER WALL SURFACE CONVERGING AS A SUBSTANTIALLY UNIFORM CONE FROM SAID SWIRLING MEANS DISPOSED TO THE REAR OF THE AXIAL TERMINUS OF SAID TUBULAR DUCT TO SAID DISCHARGE ORIFICE DISPOSED IN FRONT OF THE AXIAL TERMINUS OF SAID TUBULAR DUCT, SAID SWIRL CHAMBER HAVING REAR ENCLOSURE MEANS EXTENDING BETWEEN THE EXTERIOR OF SAID TUBULAR DUCT AND SAID SWIRL CHAMBER WALL SURFACE SO THAT SAID SWIRL CHAMBER IS SUBSTANTIALLY COMPLEMENT ENCLOSED AT THE REAR THEREOF, SAID SWIRLING MEANS COMPRISING SWIRLING PASAGEWAY MEANS HAVING SWIRLING OPENING MEANS AT THE REAR OF SAID SWIRL CHAMBER, SAID SWIRLING PASSAGEWAY MEANS EXTENDING THROUGH NOT MORE THAN A MINOR PROPORTION OF THE SURFACE OF THE REAR WALL OF SAID SWIRL CHAMBER, SAID SWIRLING PASSAGEWAY MEANS OPENING INTO SAID SWIRL CHAMBER ONLY AT SAID CONICAL SWIRL CHAMBER WALL SURFACE LATERALLY REMOTE FROM SAID TUBULAR DUCT AND REARWARDLY WITH RESPECT TO THE AXIAL TERMINUS OF SAID TUBULAR DUCT, SAID SWIRLING PASSAGEWAY MEANS OPENING INTO SAID SWIRL CHAMBER IN BOTH A FORWARDLY AND SUBSTANTIALLY TANGENTIAL DIRECTION WITH RESPECT TO SAID CONCAL SWIRL CHAMBER WALL SURFACE ADAPTED FOR THE ADMISSION TO SAID SWIRL CHAMBER OF A SWIRLING PRESSURIZED GAS IN BOTH A FORWARDLY AND SUBSTANTIALLY TANGENTIAL DIRECTION WITH RESPECT TO SAID CONICAL SWIRL CHAMBER WALL SURFACE.