| 摘要 |
PURPOSE:To suppress the temperature increase of main combustion zone for lowering the emission of NOX, by defining an annular passage for introducing a primary and a secondary airs between an outer and an inner cylinders of the combustor. CONSTITUTION:An air blown-out from the outlet 22 of compressor flows from the rear part of inner cylinder 12 to the top end thereof, as shown by an arrow mark. A part of this outlet air flows from an inlet opening 20 to a secondary annular passage 19 wherein it passes while cooling the peripheral wall of inner cylinder 12, and enters into the second inner cylinder 12 through a wall surface cooling air port 14 and a diluted air port 15. The remaining part of outlet air enters into a main combustion zone 25 of inner cylinder 12 through a primary air port 16 and a secondary air port tube 21 as a primary air and a secondary air respectively. A fuel injected through a fuel nozzle 17 is mixed with the primary and secondary airs to be burnt. A combustion gas from the main combustion zone 25 is mixed in a downstream diluted zone with an air flowed from the diluted air port 15 and the wall surface cooling air port 14, and then flows into a turbine one-stage nozzle 24 through a transition piece 23. |
