Annular combustion chambers for gas turbine engines

Claim 1

A ROTARY FUEL INJECTION TYPE ANNULAR COMBUSTION DEVICE PARTICULARLY OF THE L-SHAPED KIND AS USED IN A GASTURBINE ENGINE, HAVING A CASING POSITIONED BETWEEN THE COMPRESSOR AND THE TURBINE, AN EXTERNAL WALL AND AN INTERNAL WALL IN SAID CASING BOUNDING A COMBUSTION CHAMBER HAVING COMBUSTION AND DILUTION REGIONS, SAID INTERNAL WALL DEFINING AN INTERVAL CAVITY THEREIN, SAID WALLS BEING PROVIDED WITH HOLES FOR ADMITTING GAS DILUTION AIR THEREBETWEEN, AND RADIAL AIR DUCTS EXTENDING FROM THE EXTERNAL WALL AND OPENING IN FRONT OF CORRESPONDING HOLES IN SAID INTERNAL WALL FOR FEEDING SAID COMBUSTION CHAMBER WITH AIR VIA SAID INTERNAL CAVITY AND THE OTHER OF SAID HOLES IN SAID INTERNAL WALL, THE IMPROVEMENT ACCORDING TO WHICH SAID RADIAL AIR DUCTS ARE OF DECREASING CROSSSECTION FROM THEIR ENTRANCE AT THE EXTERNAL WALL, AND DIFFUSERS ON SAID INTERNAL WALL FIXEDLY SURROUNDING THE HOLES THEREIN FACING SAID DUCTS, SAID DIFFUSERS EXTENDING RADIALLY INWARDS OF SAID INTERNAL WALL INTO SAID CAVITY DEFINED THEREBY.