AIR FUEL PREMIXER FOR LOW EMISSIONS GAS TURBINE COMBUSTOR

摘要

A system for premixing fuel and air prior to combustion in a gas turbine engine includes a mixing duct, a centerbody fuel injector located along a central axis of the mixing duct, an outer annular swirler located adjacent an upstream end of the mixing duct for swirling air flowing therethrough in a first swirl direction and an inner annular swirler located adjacent of the mixing duct upstream end for swirling air flowing therethrough in a second swirl direction. The system includes a hub separating said inner and outer annular swirlers to permit independent rotation of an air stream therethrough and multiple hollow paths located radially outward around the centerbody fuel injector and at a radially inward side of the inner annular swirler for allowing a flow of sweeping air over the surface of the centerbody fuel injector.

主权项

1. A system for premixing fuel and air prior to combustion in a gas turbine engine, comprising:
a mixing duct having a circular cross-section defined by a wall; a centerbody fuel injector located along a central axis of the mixing duct and extending substantially the full length of said mixing duct, an outer annular swirler located adjacent an upstream end of the mixing duct and including a plurality of circumferentially spaced vanes oriented so as to swirl air flowing therethrough in a first swirl direction; an inner annular swirler located adjacent of the mixing duct upstream end and including a plurality of circumferentially spaced vanes oriented so as to swirl air flowing therethrough in a second swirl direction opposite of the first swirl direction; a hub separating said inner and outer annular swirlers to permit independent rotation of an air stream therethrough; and a plurality of hollow paths located radially outward around the centerbody fuel injector and at a radially inward side of the inner annular swirler; wherein the plurality of hollow paths are configured to allow a flow of sweeping air over the surface of the centerbody.