COOLING APPARATUS FOR A FUEL INJECTOR

摘要

An annular air swirler is configured to receive a fuel injector (1) in a central bore thereof. The air swirler has one or more annular channels (2), with each annular channel (2) defined by radially facing channel walls and having an inlet for receiving compressed air and an axially distal outlet. The channel walls converge radially inwardly towards the outlet and swirl vanes extend between opposing faces of the radially facing walls. The swirler is configured for turning incoming air to create a vortex at the channel outlet. An annular cooling apparatus is associated with the air swirler and arranged axially adjacently downstream of the channel outlet(s). The cooling apparatus comprising a skirt portion (5;25) radially spaced from a converging portion of the radially outermost channel wall (4) defining a radially converging portion of a bowed coolant channel (8). A radially outwardly extending wall (6;26) connects with the radially outermost channel wall (4) adjacent the outlet and, with a radially extending face of the skirt portion (5;25), defines a radially outwardly extending portion of the bowed coolant channel (8). The bowed coolant channel is adapted for increased heat exchange.