Patent ID: 8925325
Filing Date: 2015-01-06
Classification: F23C,F23R,Y02E,Y02T

Abstract:
1. A recirculation product injection nozzle comprising: a) a nozzle housing having an inlet end and opposed outlet end, the nozzle housing defining a central axis along a direction from the inlet end to the outlet end; b) an outer air swirler mounted to the nozzle housing and configured to impart swirl to a flow of compressor discharge air from upstream of the inlet end passing through the outer air swirler with sufficient swirl strength to recirculate combustion products from downstream of the outlet end into an outer recirculation zone in proximity with the outlet end; c) an outer fuel injector mounted proximate to the outer air swirler and being configured and adapted to inject a spray of fuel into the outer recirculation zone; d) an inner air swirler mounted radially inboard of the outer air swirler and outer fuel injector with respect to the central axis, the inner air swirler including a central cavity defined therein along the central axis and being configured and adapted to impart swirl to a flow of compressor discharge air from upstream of the inlet end passing through the inner air swirler with sufficient swirl strength to recirculate combustion products from downstream of the outlet end into an inner recirculation zone radially inboard of the outer recirculation zone and extending into the central cavity; e) an inner fuel injector mounted radially outboard of the central cavity of the inner air swirler and configured to inject a spray of fuel through a layer of compressor discharge air from the inner air swirler and into the inner recirculation zone; and f) an inner intermediate air passage between the inner air swirler and the inner fuel injector, wherein the inner air swirler includes a radial air swirler defined therethrough in a downstream portion thereof for passage of air from the inner intermediate air passage into the central cavity.