Turbine combustor system having aerodynamic feed cap

摘要

Present embodiments are directed toward reducing low flow or no flow situations in a head end of a turbine combustor. Embodiments include a system having a turbine combustor. The turbine combustor includes a fuel nozzle having an inner shell and an outer shell, and a feed cap disposed about the fuel nozzle and having an outer wall and a back plate. The back plate joins respective upstream ends of the outer shell of the fuel nozzle and the outer wall of the feed cap. The turbine combustor is configured to flow a first pressurized air via an air path extending along the outer wall of the feed cap, the back plate of the feed cap, and into the fuel nozzle.

主权项

1. A system, comprising:
a turbine combustor, comprising:
a fuel nozzle comprising an inner shell and an outer shell;a feed cap disposed about the fuel nozzle comprising an outer wall and a back plate, wherein the back plate meets respective upstream end termini of the outer shell of the fuel nozzle and the outer wall of the feed cap; and
a pressurized chamber surrounding the fuel nozzle, wherein the outer wall of the feed cap, the outer shell of the fuel nozzle, and the back plate form three walls of the pressurized chamber;wherein the turbine combustor is configured to flow a first pressurized air from a first source at a first pressure via a fluid path extending along the outer wall of the feed cap, the back plate of the feed cap, and into the fuel nozzle, wherein the fluid path comprises a segment between the back plate of the feed cap and an end plate of a head end chamber of the turbine combustor, wherein the segment is substantially free of flow-impeding surfaces between the back plate and the end plate;wherein the turbine combustor is configured to flow a second pressurized air from a second source at a second pressure, greater than the first pressure, into the pressurized chamber.