Patent ID: 8443608
Filing Date: 2013-05-21
Classification: F02C,F23K,F23R,Y10T

Abstract:
1. A feed arm for a multiple circuit fuel injector of a gas turbine engine, the feed arm comprising: (a) an elongated tubular sleeve having a central bore with an interior wall defining an inner diameter; (b) an elongated fuel tube positioned within the bore of the tubular sleeve, the fuel tube having a tubular wall defining an outer diameter, wherein the outer diameter of the fuel tube is substantially equal to the inner diameter of the central bore; (c) a helical primary fuel flow passage formed in the tubular wall of the fuel tube and bounded by the interior wall of the tubular sleeve, the helical primary fuel flow passage extending along the majority of the axial length of the fuel tube and circumferentially extending around the fuel tube at least once along the axial length of the fuel tube; and (d) a secondary fuel flow passage extending through a central portion of the fuel tube.