Apparatus for pulsating combustion

Claim 1

APPARATUS FOR THE PULSATING COMBUSTION OF A COMBUSTIBLE MIXTURE OF AIR AND FLUID FUEL, INCLUDING, IN SERIES AN INLET DUCT FOR A CURRENT OF SUCH MIXTURE SAID DUCT INCLUDING A NON-RETURN VALVE AND HAVING A DISCHARGE MOUTH; A FIRST CHAMBER INTO WHICH SAID INLET DUCT DISCHARGES, SAID FIRST CHAMBER HAVING A REAR END WALL IN WHICH SAID INLET DUCT IS LOCATED AND AN OPPOSITE FORWARD END WALL AT LEAST A PORTION OF WHICH IS GENERALLY CONCAVE; A RESTRICTED CONNECTING PASSAGEWAY COMMUNICATING WITH SAID FIRST CHAMBER AT SAID FORWARD END WALL; A SECOND CHAMBER COMMUNICATION WITH SAID FIRST CHAMBER BY MEANS OF SAID CONNECTING PASSAGEWAY; AND A DISCHARGE OUTLET IN SAID SECOND CHAMBER OPPOSITE TO SAID CONNECTING PASSAGEWAY; EACH OF SAID INLET DUCT, FIRST CHAMBER, CONNECTING PASSAGEWAY, SECOND CHAMBER AND DISCHARGE OUTLET BEING ROTATIONALLY SYMMETRICAL ABOUT ONE COMMON MAIN AXIS AND SERIALLY PROVIDING A STRAIGHT FLOWTHROUGH DIRECTION AND SYMMETRICAL AND STABLE FLOW FOR SUCH MIXTURE; SAID FIRST CHAMBER BEING CHARACTERIZED IN THAT ITS MAIN AXIAL DIMENSION FROM THE REARMOST PORTION OF ITS REAR END WALL TO SAID RESTRICTED PASSAGEWAY IS SHORTER THAN IS ITS MAXIMUM INNER RADIUS RESULTING IN A RELATIVELY FLAT CONFIGURATION AND IN THAT THE REARMOST PORTION OF ITS REAR END WALL IS AXIALLY OFFSET REARWARDLY IN RELATION TO THE MOUTH OF SAID INLET DUCT AND IN THAT SAID AT LEAST PARTIALLY CONCAVE FORWARD END WALL FORMS A SUBSTANTIALLY CONCAVE ANNULAR WALL PORTION EXTENDING RADIALLY OUTWARDLY TO THE INNER PERIPHERY OF THE FIRST CHAMBER, WHEREBY WHIRLING VORTICAL FLOW OF AIR-FUEL MIXTURE IN SAID FIRST CHAMBER IS ENSURED.