Trapped vortex combustor for a gas turbine engine with a driver airflow channel

A trapped vortex combustor for use in a gas turbine engine, the trapped vortex combustor defining a radial direction and a circumferential direction, the trapped vortex combustor comprising:

• an outer vortex chamber wall defining a forward end and comprising an inner surface, and having an outer vortex chamber wall flange;
• a dome having an outer dome flange;
• and
• a mount attaching the outer dome flange to the outer vortex chamber wall flange, a channel defined between the outer dome flange and the outer vortex chamber wall flange,
• wherein the dome, the outer vortex chamber wall, or both define at least in part an outer trapped vortex chamber, the channel extending along the circumferential direction at the mount between the outer dome flange and the outer vortex chamber wall flange and configured to receive an airflow, at least one of the mount, the outer dome flange, or the outer vortex chamber wall flange defining a plurality of openings in airflow communication with the channel for providing the airflow as a continuous annular airflow to the inner surface of the outer vortex chamber wall, wherein the dome further defines a fuel nozzle opening, with all openings in the dome outward of the fuel nozzle opening along the radial direction, excepting any effusion cooling holes having a diameter less than about 0.035 inches, being in airflow communication with the channel.