Fluid fuel combustion apparatus

Claim 1

APPARATUS FOR BURNING FLUID FUEL TO PROVIDE A STABLE, MONPULSATING FLAME OF RELATIVELY SHORT LENGTH COMPRISING A DUCT HAVING INLET AND OUTLET ENDS WITH SAID INLET END BEING ADAPTED TO BE CONNECTED TO A SOURCE OF COMBUSTION AIR, A SLEEVE MOUNTED WITHIN AND SPACED FROM SAID DUCT AND HAVING A THERMAL END LOCATED UPSTREAM OF SAID OUTLET END FOR PROVIDING A FLOW PATH FOR COMBUSTION AIR BETWEEN THE SLEEVE AND THE DUCT, A BAFFLE MEMBER CARRIED BY SAID TERMINAL END OF THE SLEEVE ARRANGED TRANSVERSELY WITH RESPECT TO SAID SLEEVE, SAID BAFFLE MEMBER HAVING A CENTRAL APERTURE THEREIN AND A PERIPHERAL EDGE PROJECTING INTO THE AIR FLOW PATH BETWEEN THE SLEEVE AND THE DUCT WITH SUCH PERIPHERAL EDGE PROVIDING A CONTINUOUS GAP OF CONSTANT WIDTH BETWEEN THE BAFFLE MEMBER AND THE OPPOSED SURFACE OF THE DUCT, AT LEAST ONE FUEL NOZZLE MOUNTED WITHIN SAID SLEEVE FOR DIRECTING FLUID FUEL THROUGH SAID CENTRAL APERTURE TO THE DOWNSTREAM OF SAID BAFFLE, MEMBER, MEANS FOR DIRECTING AIR UPSTREAM OF SAID BAFFLE MEMBER FOR PASSAGE THROUGH SAID CENTRAL APERTURE, AND THE OUTLET END OF SAID DUCT BEING STRAIGHT AND EXTENDING BEYOND SAID BAFFLE MEMBER A DISTANCE SUBSTANTIALLY EQUAL TO THE WIDTH OF SAID GAP WHEREBY THE AIR PRESSURE BETWEEN THE SLEEVE AND DUCT WILL TEMPORARILY INCREASE DUE TO THE PROJECTING PERIPHERAL EDGE AND AFTER PASSING SUCH EDGE WILL EXPAND AND BE DIRECTED INWARDLY WITH THE AIR FLOW AND FUEL PASSSIG THROUGH THE CENTRAL APERTURE AND DUE TO THE LOW PRESSURE AREA ON THE DOWNSTREAM SIDE OF THE BAFFLE MEMBER, THE FUEL WILL BE DIRECTED TO THE LOW PRESSURE AREA AND MAINTAINED IN SUCH AREA BY THE INWARDLY FLOWING AIR AND THE AIR PASSING THROUGH THE CENTRAL APERTURE.