Fuel injectors with multiple outlet slots for use in gas turbine combustor
A fuel injector includes a frame and a pair of fuel injection bodies coupled to the frame. The frame has interior sides that define an opening for passage of a first fluid. Inlet flow paths for the first fluid are defined at least between the interior sides of the frame and the respective fuel injection bodies. Each fuel injection body defines a fuel plenum and includes at least one fuel injection surface that defines a plurality of fuel injection holes in communication with the fuel plenum. An outlet member is located downstream of, and in fluid communication, with the inlet flow paths. The outlet member is configured to produce discrete outlet flow paths exiting the outlet member via struts, flow diverters, and/or separate outlet members.
1. A fuel injector comprising:
a frame having interior sides defining an opening, for passage of compressed air from a plenum defined within a compressor discharge case surrounding a combustor;
a first fuel injection body and a second fuel injection body, the first fuel injection body and the second fuel injection body being coupled to the frame and being positioned within the opening such that inlet flow paths for the compressed air are defined at least between the interior sides of the frame and the first fuel injection body and between the interior sides of the frame and the second fuel injection body, wherein
the first fuel injection body defines a first fuel plenum,
the second fuel injection body defines a second fuel plenum, and
each of the first fuel injection body and the second fuel injection body includes at least one fuel injection surface defining a plurality of fuel injection holes in communication with the respective first or second fuel plenum;
an outlet member downstream of and in fluid communication with the inlet flow paths,
the outlet member comprising:
a pair of struts configured to produce discrete outlet flow paths exiting the outlet member,
a leading edge end wall,
a trailing edge end wall substantially parallel to the leading edge end wall, and
a pair of outlet side walls connecting the leading edge end wall and the trailing edge end wall, and wherein
the pair of struts extends longitudinally from the leading edge end wall to the trailing edge end wall; and wherein
the fuel injector is configured to be mounted to an external surface of the combustor to inject a mixture of compressed air and fuel through a liner of the combustor.
2. The fuel injector of claim 1 , further comprising a conduit fitting coupled to the frame and fluidly connected to each of the first fuel plenum and the second fuel plenum; and wherein the conduit fitting is fluidly connected to a fuel supply line.
3. The fuel injector of claim 1 , wherein each strut of the pair of struts comprises a shape diverging in a direction of flow through the fuel injector, each strut of the pair of struts having a leading edge proximate to at least one of the first fuel injection body and the second fuel injection body and a trailing edge opposite the leading edge.
4. The fuel injector of claim 1 , further comprising a third fuel injection body; and wherein a number of inlet flow paths is greater than a number of outlet flow paths.
5. The fuel injector of claim 1 , wherein each strut of the pair of struts comprises a planar surface and an arcuate surface, the planar surface and the arcuate surface being connected at a leading edge; and wherein the pair of struts is disposed with the planar surface of a first strut being adjacent the planar surface of a second strut to define a central outlet slot therebetween.
6. The fuel injector of claim 4 , wherein each strut of the pair of struts tapers from a narrow dimension at the leading edge end wall to a wider dimension at the trailing edge end wall.
7. The fuel injector of claim 6 , further comprising a first flow diverter disposed along a first outlet side wall of the pair of outlet side walls, and a second flow diverter disposed along a second outlet side wall of the pair of outlet side walls; and wherein the first flow diverter and the second flow diverter protrude into the outlet flow paths.
8. The fuel injector of claim 7 , wherein the first flow diverter and the second flow diverter protrude a first distance into the outlet flow paths from the leading edge end wall to a second distance at the trailing edge end wall, the first distance being larger than the second distance; and wherein the outlet flow paths comprise a center outlet flow path along a longitudinal axis of the fuel injector, a first outlet flow path inclined in a first direction relative to the longitudinal axis of the fuel injector, and a second outlet flow path inclined in a second direction relative to the longitudinal axis of the fuel injector.
9. The fuel injector of claim 8 , wherein the center outlet flow path, the first outlet flow path, and the second outlet flow path are proximate one another at the leading edge end wall; and wherein the first outlet flow path and the second outlet flow path are inclined away from the longitudinal axis at the trailing edge end wall.
10. The fuel injector of claim 1 , further comprising a mounting flange disposed between the frame and the outlet member, the mounting flange securing the fuel injector to the external surface of the combustor.