Trailing edge fuel injection enhancement for flame holding mitigation

A combustor for a gas turbine engine, the combustor comprising:

• a combustion liner defining a combustion zone therein;
• and
• a first injector surrounding the combustion liner and comprising:
• a plurality of first vanes radially arrayed about a central axis of the injector, each of the first vanes separated from an adjacent one of the first vanes by one of a plurality of first passages forming part of a radially outer flow path;
• a plurality of second vanes radially arrayed about the central axis of the injector and disposed radially inward of the plurality of first vanes, each of the second vanes separated from an adjacent one of the second vanes by one of a plurality of second passages forming part of a radially inner flow path, each of the plurality of second vanes including:
• a leading edge;
• a trailing edge including a stepped profile comprising:
• a radially outer first portion having a first length in a radial direction;
• a radially intermediate second portion having a second length in the radial direction;
• and
• a radially inner third portion having a third length in the radial direction,
• the second length being greater than the third length, and the third length being greater than the first length,
• the radially intermediate second portion including a second trailing end circumferentially offset from a first trailing end of the radially outer first portion and a third trailing end of the radially inner third portion;
• a plurality of fuel injection holes disposed on the radially intermediate second portion nearer to the trailing edge than to the leading edge and configured to inject fuel into compressed air passing through the radially inner flow path;
• and
• a fuel feed hole in fluid communication with the plurality of fuel injection holes and configured to supply the fuel to the plurality of fuel injection holes,
• wherein the trailing edge stepped profile is configured to induce turbulence in the compressed air passing through the radially inner flow path to thereby mix the fuel with the compressed air upstream the combustion chamber.