a primary swirler comprising (a) a primary swirl portion defining a primary swirl passage having a plurality of primary swirl vanes therewithin, (b) a fuel nozzle connecting portion arranged radially inward of the primary swirl portion and having a fuel nozzle opening therethrough configured to interface with a fuel nozzle, and (c) a primary swirler connecting portion arranged on a downstream side of the primary swirl portion and having a primary swirler flow opening therethrough, the fuel nozzle connecting portion and the primary swirler connecting portion defining a primary oxidizer flow passage therebetween that is in fluid communication with the primary swirl passage, the primary oxidizer flow passage extending at least partially in a longitudinal direction; and

a secondary swirler comprising (a) a venturi, and (b) a secondary swirler connecting member arranged on an upstream side of the secondary swirler,

wherein the primary swirler connecting portion and the secondary swirler connecting member engage to interface the primary swirler and the secondary swirler in the longitudinal direction, and to permit radial movement of the primary swirler with respect to the secondary swirler,

wherein the swirler assembly defines a swirler assembly centerline therethrough, the longitudinal direction along the swirler assembly centerline, a radial direction extending outward from the swirler assembly centerline, and a circumferential direction about the swirler assembly centerline, and

the secondary swirler further comprises (c) a secondary swirl portion defining a secondary swirl passage having a plurality of secondary swirl vanes therewithin, and (d) a secondary annular axial wall extending in the longitudinal direction downstream of the secondary swirl portion, the venturi being arranged radially inward of the secondary swirl portion and the secondary annular axial wall, a secondary oxidizer flow passage being defined between the venturi, the secondary swirl portion, and the secondary annular axial wall, and

wherein the primary swirl portion comprises (i) a first primary swirl portion radial wall, (ii) a second primary swirl portion radial wall downstream of the first primary swirl portion radial wall, and (iii) the primary swirl vanes connecting the first primary swirl portion radial wall and the second primary swirl portion radial wall,

the fuel nozzle connecting portion comprises an annular fuel nozzle wall extending radially between the fuel nozzle opening to the first primary swirl portion radial wall, and including a fuel nozzle wall radially inward portion extending downstream relative to the first primary swirl portion radial wall, a primary oxidizer flow passage upstream surface of the primary oxidizer flow passage being defined by a radially outer surface of the fuel nozzle wall radially inward portion, and

the primary swirler connecting portion comprises a primary swirler connecting portion radial wall having the primary swirler flow opening therethrough, and including a connecting wall connecting a radially inward portion of the primary swirler connecting portion radial wall and the second primary swirl portion radial wall so as to define a primary swirler connecting portion gap between the second primary swirl portion radial wall and the primary swirler connecting portion radial wall, a radially inner surface of the connecting wall defining a primary oxidizer flow passage downstream surface of the primary oxidizer flow passage.