FUEL SPRAY NOZZLE

摘要

Nozzle for engine has coaxial arrangement of inner pilot and outer mains airblast fuel injectors and intermediate air-swirler passage sandwiched between the outer and inner air-swirler passages of the pilot and mains airblast fuel injectors, respectively. The nozzle has an annular first-splitter wall separating the pilot outer air-swirler passage from the intermediate one. An outer surface profile of the first-splitter wall defines radially inner side of the intermediate air-swirler passage. The nozzle has an annular second-splitter wall separating the intermediate air-swirler passage from mains inner air-swirler passage. An inner surface profile of second-splitter wall defines radially outer side of intermediate air-swirler passage. The outer and inner surface profile of the first and second splitters walls, respectively, have convergent sections facing each other forming convergent portion of the intermediate air-swirler passage. The inner surface profile of the second-splitter wall has a divergent section downstream of its convergent section.

主权项

1. A fuel spray nozzle for a gas turbine engine, the nozzle having a coaxial arrangement of an inner pilot airblast fuel injector and an outer mains airblast fuel injector, the nozzle further having an intermediate air swirler passage which is sandwiched between an outer air swirler passage of the pilot airblast fuel injector and an inner swirler air passage of the mains airblast fuel injector, wherein:
the nozzle further has an annular first splitter wall which separates the pilot outer air swirler passage from the intermediate air swirler passage, an outer surface profile of the first splitter wall defining a radially inner side of the intermediate air swirler passage; and the nozzle further has an annular second splitter wall which separates the intermediate air swirler passage from the mains inner air swirler passage, an inner surface profile of the second splitter wall defining a radially outer side of the intermediate air swirler passage; the outer surface profile of the first splitter wall and the inner surface profile of the second splitter wall having respective convergent sections which face each other to produce a convergent portion of the intermediate air swirler passage, and the inner surface profile of the second splitter wall further having a divergent section downstream of its convergent section, the second splitter wall contains a row of circumferentially arranged internal bypass ducts which are arranged such that, in use, a portion of the air flow through the intermediate air swirler passage is diverted through the ducts to by-pass the convergent portion of the intermediate air swirler passage, the diverted air exiting the ducts to re-join the non-diverted air flow at the divergent section of the inner surface profile of the second splitter wall.