Pilot premix nozzle and fuel nozzle assembly

A fuel nozzle assembly, comprising:

• an outer tube;
• an inner tube extending coaxially within the outer tube;
• an intermediate tube extending coaxially within the outer tube and circumferentially surrounding the inner tube, wherein the intermediate tube is radially spaced from the outer tube;
• and
• a premix pilot nozzle coupled to a downstream end of the outer tube via a nozzle ring, the premix pilot nozzle comprising a nozzle body, the nozzle body comprising:
• a forward wall axially spaced from an aft wall and an outer band that extends axially between the forward wall and the aft wall, wherein the aft wall includes an inner surface axially spaced from an outer surface;
• an air tube coupled to the inner tube and extending coaxially within the nozzle body, wherein the air tube terminates at the inner surface of the aft wall, wherein the air tube defines a cooling air plenum within the nozzle body;
• a fuel tube coupled to the intermediate tube and extending coaxially within the nozzle body, wherein the fuel tube circumferentially surrounds at least a portion of the air tube, wherein the fuel tube and the air tube define a fuel inlet plenum therebetween;
• a fuel distribution plenum defined within the nozzle body and in fluid communication with the fuel inlet plenum;
• and
• a plurality of premix tubes, wherein each premix tube defines a premix passage through the nozzle body and includes an inlet defined along the forward wall and an outlet defined along the aft wall, wherein each premix tube extends helically around the fuel tube within the fuel distribution plenum, wherein one or more of the premix tubes of the plurality of premix tubes is in fluid communication with the fuel distribution plenum.