摘要：

A fuel/air mixing apparatus, such as a main swirler assembly ( 400 ) comprising a sleeve ( 410 ), provides for additional air entry around the perimeter of a bore ( 440 ) through which passes a fuel/air mixture. The additional air reduces or eliminates flashback during operation of a gas turbine comprising the assembly ( 400 ). In some embodiments, a plurality of gaps ( 464 ) exists between spaced apart tabs ( 462 ) along a downstream end ( 460 ) of the sleeve ( 410 ). During gas turbine operation, air flows through both a flashback annulus ( 411 ) and the gaps ( 464 ). In other embodiments, a plurality of holes are placed upstream and in line with the tabs ( 1004 ) to supplement the air flow through gaps ( 1006 ). In yet other embodiments, rows ( 1102 ) of holes ( 1104 ) are provided to supplement the airflow. Downstream ends ( 460,1218 ) may interface with a downstream-oriented lip ( 460 ) or with an upstream-oriented lip ( 1224 ). The interfacing may comprise a fit effective to damp vibration and to increase the natural frequency.

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