FUEL INJECTOR AND A GAS TURBINE ENGINE COMBUSTION CHAMBER

摘要

A gas turbine engine lean burn fuel injector includes a fuel injector head which has a first air swirler, a second air swirler arranged around the first air swirler, a pilot fuel injector arranged radially between the first air swirler and the second air swirler. A third air swirler arranged around the second air swirler, a fourth air swirler arranged around the third air swirler and a main fuel injector arranged radially between the third air swirler and the fourth air swirler. A shroud is arranged around the fourth air swirler. A downstream end of the shroud is generally circular in cross-section in a plane perpendicular to the axis (Y) of the fuel injector head and an upstream end of the shroud is generally elliptical in cross-section in a plane perpendicular to the axis (Y) of the fuel injector head.

主权项

1. A fuel injector comprising a main fuel injector and at least one air swirler, wherein a shroud is arranged around the main fuel injector and at least one air swirler, the fuel injector has an axis, the shroud has a radially inner surface, the radially inner surface of the shroud is generally circular in cross-section in a plane perpendicular to the axis of the fuel injector at the downstream end of the shroud, the radially inner surface of the shroud is generally non-circular in cross-section in a plane perpendicular to the axis of the fuel injector at the upstream end of the shroud and has different dimensions in two mutually perpendicular directions.