Patent ID: 8312724

Claim:
A mixer assembly for a gas turbine engine comprising: a main mixer; and a pilot mixer concentrically arranged with the main mixer, wherein the main mixer surrounds at least a portion of the pilot mixer, the pilot mixer comprising an annular housing separating the pilot mixer from the main mixer and forming a cavity, wherein the annular housing has a forward portion and an aft portion and wherein the aft portion has a larger diameter than the forward portion, a downstream end of the aft portion having an annular endplate; a first circumferential set of longitudinal holes extending through the aft portion and the annular endplate; a fuel nozzle surrounded by the forward portion of the annular housing; a bulkhead wall located downstream of the fuel nozzle and upstream and radially inward of the annular endplate, the bulkhead wall connecting a radially outer surface of the forward portion of the annular housing to a radially inner surface of the aft portion of the annular housing, wherein the bulkhead wall is substantially perpendicular to the aft portion of the annular housing forming a corner between the aft portion of the annular housing and the bulkhead wall; and a second circumferential set of longitudinal holes distributed in and extending transversally through the bulkhead wall proximate the inner surface of the aft portion of the annular housing.