Method and apparatus for injecting dilution air.

摘要

A method of diluting combustion gases in a gas turbine engine combustor includes injecting primary dilution air into the combustion gases, and injecting trim dilution air into the combustion gases adjacent to the injected primary dilution air. A dilution air injector for practicing the method includes a plate, or centerbody (80) in an exemplary embodiment, having a primary dilution hole (108) for injecting a portion of compressed air into combustion gases as primary dilution air, and a trim dilution hole (112) for injecting a portion of the compressed air into the combustion gases as trim dilution air. The primary and trim dilution holes are sized and configured so that the primary and trim dilution air cooperate with each other for penetrating into and diluting a predetermined portion of the combustion gases. <IMAGE>