Combustion device for gas turbine engine

Abstract

A combustor includes: a combustion liner having a combustion chamber formed therein; a fuel injector mounted to a top portion of the combustion liner, and including a fuel injection member having a plurality of fuel injection annular portions and an air guide member including a plurality of combustion air annular portions that guide air for combustion; and a supplemental burner. The fuel injection annular portions and the combustion air annular portions are arranged concentrically and alternately. The fuel injector injects fuel and air into the combustion chamber. Each of the fuel injection annular portions includes a plurality of fuel injection holes that are open in a radial direction thereof, and each of the combustion air annular portions includes a plurality of air guide groove that are open in an axial direction thereof, and guide the air to the fuel jetted from the fuel injection holes.

What is claimed is: 
     
         1 . A combustor comprising:
 a combustion liner having a combustion chamber formed therein;   a fuel injector mounted to a top portion of the combustion liner and configured to inject fuel and air into the combustion chamber, the fuel injector including a fuel injection member having a plurality of fuel injection annular portions, and an air guide member having a plurality of combustion air annular portions that guide an air for combustion, the fuel injection annular portions and the combustion air annular portions being arranged concentrically and alternately; and   a supplemental burner disposed on a peripheral wall of the combustion liner in a downstream region in the combustion chamber, wherein   each of the fuel injection annular portions includes a plurality of fuel injection holes that are open in a radial direction thereof, and   each of the combustion air annular portions includes a plurality of air guide grooves that are open in an axial direction thereof, and guides the air to the fuel jetted from the fuel injection holes.   
     
     
         2 . The combustor as claimed in  claim 1 , wherein the supplemental burner includes a premixing chamber configured to stir and mix a fuel and an air, so as to inject a premixed gas generated in the premixing chamber into the combustion chamber. 
     
     
         3 . The combustor as claimed in  claim 1 , further comprising an air-flow rectifying mechanism provided upstream of the fuel injector, and configured to rectify flow of the air supplied to the air guide member. 
     
     
         4 . The combustor as claimed in  claim 1 , further comprising a rectifying protrusion member that is provided on an axis of the combustor and penetrates through the fuel injector so as to protrude toward the combustion chamber. 
     
     
         5 . The combustor as claimed in  claim 4 , wherein the rectifying protrusion member includes a support portion, and a protruding portion protruding from the support portion into the combustion chamber, and has a cooling air introduction hole that is formed in the support portion to introduce the air into the rectifying protrusion member, and a cooling air discharge hole that is formed in the protruding portion to discharge the air introduced into the rectifying protrusion member to the combustion chamber. 
     
     
         6 . The combustor as claimed in  claim 1 , wherein each of the fuel injection annular portions is formed as a hollow portion, and a hollow space in the fuel injection annular portion forms an annular fuel flow passage that allows the fuel to flow in a circumferential direction thereof. 
     
     
         7 . The combustor as claimed in  claim 5 , wherein the fuel injection annular portion includes: a first fuel flow passage that is positioned on a combustion chamber side and is communicated with the fuel injection holes; a second fuel flow passage that is positioned on a side opposite to the combustion chamber, and is supplied with the fuel to be jetted from the fuel injection holes; and an injection nozzle configured to jet the fuel in the second fuel flow passage to a wall surface of the first fuel flow passage on the combustion chamber side. 
     
     
         8 . A combustor as claimed in  claim 1 , comprising:
 a fuel supply main pipe having a multiple pipe structure, and configured to supply the fuel to the fuel injection member,   wherein the fuel supply main pipe includes a first supply passage configured to supply the fuel to a first annular portion group of the plurality of fuel injection annular portions, and a second supply passage configured to supply the fuel to a second annular portion group of the plurality of fuel injection annular portions.