FUEL NOZZLE WITH HEMISPHERICAL DOME AIR INLET

摘要

The present invention discloses a novel apparatus and way for directing a supply of compressed air into a fuel nozzle assembly for mixing with a fuel source. The apparatus comprises a fuel nozzle assembly having a plurality of coaxial tubes and radially-extending swirler vanes for directing a supply of fuel to a mixing tube. Compressed air is directed to flow in a primarily axial direction by passing through a hemispherically-shaped dome portion at an air inlet region of the fuel nozzle assembly. The hemispherically-shaped dome includes a plurality of openings for directing air into the fuel nozzle assembly in a direction having a radial and axial component

主权项

1. A fuel nozzle assembly comprising:
a first tube extending along a center axis and having a first passageway therein; a second tube coaxial to and radially outward of the first tube and forming a second passageway between the first tube and the second tube; a third tube coaxial to and radially outward of the second tube and forming a third passageway between a portion of the second tube and the third tube and a portion of the first tube and the third tube; a premix tube coaxial to and radially outward of the third tube, the premix tube having an inlet end and an opposing outlet end, the premix tube having a plurality of swirler vanes positioned between the third tube and premix tube, the plurality of swirler vanes configured to induce a swirl into a passing flow of fuel and air; and, a hemispherically-shaped dome extending from proximately the inlet end of the premix tube towards a base of the fuel nozzle assembly, the hemispherically-shaped dome having a plurality of openings with each of the openings oriented so as to have both an axial and radial component.