After-burner chamber with secure ignition

Abstract

A turbojet having an after-burner chamber presenting a specific injector opening into the burner ring to provide secure ignition. The after-burner chamber has an annular fuel injection duct, an ignition spark plug, and an ignition injector installed facing the spark plug and connected to specific fuel feed means.

1 . An after-burner chamber comprising an annular fuel injection duct and an ignition spark plug mounted in the vicinity of said annular duct, wherein an ignition injector is installed facing said spark plug and is connected to specific fuel feed means suitable for delivering said fuel under a controlled pressure independent of the feed conditions to said annular duct.  
   
   
       2 . An after-burner chamber according to  claim 1 , wherein said injector is fitted with a nozzle for spraying said fuel finely.  
   
   
       3 . An after-burner chamber according to  claim 1 , in which said annular duct is mounted in a burner ring, wherein said injector is mounted in said burner ring and opens out to the inside thereof, in the vicinity of said spark plug.  
   
   
       4 . An after-burner chamber according to  claim 2 , of the type in which said burner ring is placed in the hot primary stream of said after-burner chamber, wherein the injector and the spark plug are housed in a protective sheath fastened to an outer casing and opening out into said burner ring.  
   
   
       5 . An after-burner chamber according to  claim 4 , wherein said protective sheath has ventilation orifices communicating with the cold secondary stream of said after-burner chamber.  
   
   
       6 . A turbojet including an after-burner chamber according to  claim 1.