Patent ID: 7870736

Claim:
A premixing injector, comprising: a. an outer casing having a first inlet end, a second outlet end, an interior wall, and an exterior wall; b. a center body having a first open end extending from the first inlet end of the outer casing, a second closed end at the second outlet end of the outer casing, an exterior wall, an interior wall and an endcap, wherein the second closed end of the center body is substantially co-planar with the second outlet end of the outer casing; c. an annular sleeve on the center body wherein the annular sleeve is dimensioned and configured for placing the center body within the outer casing; d. an exterior annular mixing channel defined by the exterior wall of the center body and the interior wall of the outer casing; e. an air inlet port dimensioned and configured to channel compressor discharge air to the exterior annular mixing channel; f. a fuel inlet duct extending from the first open end to the second closed end of the center body, the fuel inlet duct having a first inlet end, a second outlet end, and an open passageway extending from the first open end to the second closed end, wherein the fuel inlet duct is positioned within the center body to define an interior fuel channel connected to the open passageway by a conduit, wherein the interior fuel channel extends longitudinally and in substantially parallel alignment with the exterior annular mixing channel from the conduit to a choked fuel injection port, wherein the choked fuel injection port is dimensioned and configured to introduce fuel to the exterior annular mixing channel; g. a swirler region defined within the exterior annular mixing channel, wherein the swirler region is dimensioned and configured for mixing fuel and compressor discharge air; and h. an outlet for expelling swirled and mixed fuel and air.