Burner for producing a stable flame with a high concentration of heat stabilized by a shock wave

Claim 1

A BURNER FOR PRODUCING A STABLE FLAME IN A HIGH SPEED FLUID FIELD COMPRISING, IN COMBINATION, FIRST CONDUIT MEANS HAVING A STRAIGHT AXIS FOR GUIDING A COMBUSTION SUSTAINING FLUID THERETHROUGH FED UNDER PRESSURE AND AT SUBSONIC SPEED INTO ONE END OF SAID FIRST CONDUIT MEANS, SAID FIRST CONDUIT MEANS HAVING AN OUTLET END OPPOSITE SAID ONE END; SECOND CONDUIT MEANS FOR GUIDING A FUEL FLUID THERETHROUGH FED UNDER PRESSURE AND AT SUBSONIC SPEED INTO ONE END OF SAID SECOND CONDUIT MEANS, SAID SECOND CONDUIT MEANS BEING COAXIALLY ARRANGED IN SAID FIRST CONDUIT MEANS SPACED FROM THE INNER SURFACE THEREOF; AND A BODY FIXED TO SAID SECOND CONDUIT MEANS COAXIALLY THEREWITH IN THE REGION OF SAID OUTLET END, SAID BODY COMPRISING A PAIR OF CONE SURFACES WHICH TAPER IN OPPOSITE DIRECTIONS AND HAVE A COMMON BASE CIRCLE, THUS DEFINING WITHIN SAID FIRST CONDUIT MEANS AN ANNULAR CONVERGENTDIVERGENT PASSAGE HAVING A MINIMUM CROSS SECTION IN THE PLANE OF SAID BASE CIRCLE SUCH THAT THE FLUID PASSING THERETHROUGH WILL OBTAIN SONIC SPEED, SAID SECOND CONDUIT MEANS COMMUNICATING WITH SAID FIRST CONDUIT MEANS ONLY IN THE DIVERGENT PORTION OF SAID PASSAGE SO THAT THE FLUIDS PASSING THROUGH SAID CONDUIT MEANS WILL MIX IN SAID DIVERGENT PORTION, AND THE LENGTH OF SAID DIVERGENT PORTION BEING SUCH TO PRODUCE IN SAID DIVERGENT PORTION REDUCTION OF THE PRESSURE OF SAID MIXTURE BELOW THE AMBIENT PRESSURE AT SAID OUTLET END.