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A mixer for a gas turbine engine combustor includes: (a) a primary fuel injector with upstream and downstream ends, the primary fuel injector including: (1) a hollow central portion configured to pass a first air stream; (2) an annular fuel passage at the downstream end, configured to discharge an a

A mixer for a gas turbine engine combustor includes: (a) a primary fuel injector with upstream and downstream ends, the primary fuel injector including: (1) a hollow central portion configured to pass a first air stream; (2) an annular fuel passage at the downstream end, configured to discharge an annular first fuel stream surrounding the first air stream; (b) an annular splitter surrounding the primary fuel injector, configured to pass a second air stream surrounding the first fuel stream; (c) an annular first housing surrounding the splitter, and having an exit positioned axially downstream of the primary fuel injector and the splitter; and (d) fuel injection ports disposed in an array outside the first housing, and disposed in communication with a fuel supply and positioned to discharge a second fuel stream into a third air stream at a position axially upstream of the exit of the first housing.

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1. A mixer apparatus for a gas turbine engine combustor, comprising: (a) a generally cylindrical primary fuel injector with upstream and downstream ends, the primary fuel injector including: (1) a hollow central portion configured to pass a first air stream therethrough;(2) an annular fuel passage p

1. A mixer apparatus for a gas turbine engine combustor, comprising: (a) a generally cylindrical primary fuel injector with upstream and downstream ends, the primary fuel injector including: (1) a hollow central portion configured to pass a first air stream therethrough;(2) an annular fuel passage positioned at the downstream end of the primary fuel injector, the fuel passage configured to discharge an annular first fuel stream surrounding the first air stream;(b) an annular splitter surrounding the primary fuel injector, the splitter configured to pass a second air stream surrounding the first fuel stream;(c) an annular first housing surrounding the primary fuel injector and the splitter, the first housing having an exit positioned axially downstream of the primary fuel injector and the splitter; and(d) a plurality of fuel injection ports positioned in a radial array outside the first housing, the fuel injection ports disposed in communication with a fuel supply and positioned to discharge a second fuel stream into a third air stream at a position axially upstream of the exit of the first housing. 2. The apparatus of claim 1 wherein an annular swirler is positioned within the annular fuel passage. 3. The apparatus of claim 1 wherein the primary fuel injector includes a plurality of swirlers at an upstream end of the hollow central portion. 4. The apparatus of claim 3 wherein the swirlers are substantially parallel to a central axis through the primary fuel injector. 5. The apparatus of claim 3 wherein the swirlers are substantially perpendicular to a central axis through the primary fuel injector. 6. The apparatus of claim 1 wherein an annular flowpath for channeling a third air stream is defined between an exterior surface of the splitter and an interior surface of the first housing. 7. The apparatus of claim 6 wherein a swirler is positioned within the annular flowpath. 8. The apparatus of claim 1 further comprising an outer shell surrounding the first housing, where the fuel injection ports pass through the outer shell, and each of the fuel injection ports communicates with a fuel manifold positioned between the first housing and the outer shell. 9. The apparatus of claim 1 further comprising an annular second housing surrounding the first housing, the second housing radially spaced away from the first housing to define an annular cavity configured to pass the third air stream therethrough. 10. The apparatus of claim 1 wherein an axial-flow swirler is positioned at an upstream end of the second housing. 11. The apparatus of claim 1 wherein a radial-flow swirler is positioned around the periphery of the second housing.