LATE LEAN INJECTION WITH EXPANDED FUEL FLEXIBILITY

PROBLEM TO BE SOLVED: To provide a late lean injection (LLI) fuel staging constitution of a gas turbine engine and a method to achieve the constitution. SOLUTION: The gas turbine engine (10) is equipped with a fuel circuit (70) including a plurality of fuel circuit branches (71) and (72), a combustor (20) having a first interior (21) in which the first fuel supplied by the plurality of fuel circuit branches (71) and (72) can make combustion, a turbine (50), and a second interior (41) in which the second fuel containing a gas that can be received from an external supply source through the fuel circuit (70) and supplied by the plurality of fuel circuit branches (71) and (72) and the product from combustion of the first fuel can make combustion, wherein the configuration includes a transition region (43) arranged so that the combustor (20) and the turbine (50) are put in fluid coupling with each other, and also a single axial direction stage, a plurality of axial direction stages, a single axial direction circumferential stage, and a plurality of axial direction circumferential stages, whereby a plurality of fuel injectors (60) supply the second fuel to the second interior (41) at either of the stages. COPYRIGHT: (C)2010,JPO&INPIT