Patent ID: 8479521
Filing Date: 2013-07-09
Classification: F23R,Y02T

Abstract:
1. A combustor for a gas turbine engine having an annular combustion chamber, comprising: a bulkhead disposed at a forward end of the annular combustion chamber, the bulkhead having a radial expanse and a circumferential expanse; a plurality of main fuel injection and air swirler assemblies opening through the bulkhead for admitting fuel and air into the annular combustion chamber, the plurality of main fuel injection and air swirler assemblies disposed in a circumferential ring extending about the circumferential expanse of the bulkhead; a plurality of pilot fuel injection and air swirler assemblies opening through the bulkhead for admitting fuel and air into the annular combustion chamber, the plurality of pilot fuel injection and air swirler assemblies interspersed amongst and disposed in the circumferential ring of main fuel injection and air swirler assemblies, the air swirlers of the plurality of main fuel injection and air swirler assemblies adapted to impart a lower level of swirl to air passing therethrough relative the air swirlers of the plurality of pilot fuel injection and air swirler assemblies; an inboard liner extending longitudinally fore to aft from a radially inboard extent of the circumferential expanse of the bulkhead to a combustor exit; an outboard liner extending longitudinally fore to aft from a radially outboard extent of the circumferential expanse of the bulkhead to the combustor exit; a first plurality of relatively larger combustion air admission holes formed in the outboard liner, disposed in multiple subsets of multiple holes and each subset arranged in a circumferential ring aftward of the bulkhead in association with the plurality of main fuel injection and air swirler assemblies; and a first plurality of relatively smaller combustion air admission holes formed in the outboard liner, disposed in multiple subsets of multiple holes and each subset arranged in a circumferential ring aftward of the bulkhead in association with the plurality of pilot fuel injection and air swirler assemblies.