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One embodiment of the present discloses includes a system. The system includes a turbine and a fluid supply system. The turbine includes a main flow path, a plurality of turbine blades disposed along the main flow path, at least one flow control area disposed along the main flow path, and at least o

One embodiment of the present discloses includes a system. The system includes a turbine and a fluid supply system. The turbine includes a main flow path, a plurality of turbine blades disposed along the main flow path, at least one flow control area disposed along the main flow path, and at least one fluid injection port fluidly coupled to the main flow path. The fluid supply system is fluidly coupled to the at least one fluid injection port, wherein the fluid supply system is configured to supply a fluid to the at least one fluid injection port to adjust an effective area of the at least one flow control area.

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1. A system, comprising: a turbine comprising a main flow path, a plurality of turbine blades and at least one shaft disposed along the main flow path, at least one flow control area disposed along the main flow path, and at least one fluid injection port fluidly coupled to the main flow path; anda

1. A system, comprising: a turbine comprising a main flow path, a plurality of turbine blades and at least one shaft disposed along the main flow path, at least one flow control area disposed along the main flow path, and at least one fluid injection port fluidly coupled to the main flow path; anda fluid supply system fluidly coupled to the at least one fluid injection port, wherein the fluid supply system is configured to couple to a plurality of waste heat sources, and the fluid supply system is configured to selectively use one or more waste heat sources of the plurality of waste heat sources to supply a fluid to the at least one fluid injection port to adjust an effective area of the at least one flow control area. 2. The system of claim 1, comprising a controller having a memory storing instructions to control the selective use of the one or more waste heat sources to provide the supply of the fluid to the at least one fluid injection port to adjust the effective area of the at least one flow control area to vary a flow of working fluid through the at least one flow control area of the main flow path. 3. The system of claim 1, comprising the plurality of waste heat sources. 4. The system of claim 1, wherein at least one of the plurality of waste heat sources is external from a gas turbine system having the turbine, a combustor, and a compressor. 5. The system of claim 1, wherein a controller has instructions to adjust a parameter of the fluid supplied by the fluid supply system and instructions to adjust a valve that controls a flow of the fluid supplied by the fluid supply system, and the parameter comprises a pressure, a temperature, a fluid composition, or a combination thereof. 6. The system of claim 1, wherein a controller has instructions to control the selective use of the one or more waste heat sources of the plurality of waste heat sources to selectively adjust a parameter of each fluid flow of a plurality of fluid flows based on an injection location of each fluid flow into a different one of a plurality of flow control areas, the controller has instructions to control a valve along each fluid flow of the plurality of fluid flows, and the parameter comprises a pressure, a temperature, a fluid composition, or a combination thereof. 7. The system of claim 1, wherein the fluid supply system comprises an air supply, an inert gas supply, a carbon dioxide supply, or a combination thereof. 8. The system of claim 1, wherein the at least one fluid injection port is disposed on a turbine nozzle, a stator vane, a first wall disposed about the main flow path, a shroud above a turbine blade, a stationary surface disposed along the main flow path, an outer cavity disposed between the first wall and a surrounding second wall, an inner cavity disposed within a third wall disposed about a rotational axis of the turbine, a strut extending across the main flow path, or any combination thereof. 9. The system of claim 1, wherein the plurality of waste heat sources comprise at least two of a reactor, a gasifier, a syngas cooler, a gas treatment system, an air separation unit, a liquefaction system, or a gas turbine system having the turbine. 10. The system of claim 1, wherein the at least one flow control area comprises a plurality of flow control areas disposed in different stages of a plurality of stages of the turbine, wherein each flow control area of the plurality of flow control areas comprises at least one fluid injection port fluidly coupled to the main flow path. 11. The system of claim 1, wherein the turbine comprises a gas turbine, and wherein the gas turbine comprises one or more independent shafts fluidly coupled along the main flow path, and wherein the at least one flow control area is disposed along the main flow path and along the one or more independent shafts. 12. A system, comprising: a controller having a memory storing instructions to control a selective use of one or more waste heat sources of a plurality of waste heat sources to provide a supply of a fluid from a fluid supply system to at least one fluid injection port fluidly coupled to at least one flow control area along a main flow path of a turbine, wherein the controller has instructions to control the selective use of the one or more waste heat sources to adjust the supply of the fluid to adjust the effective area to vary a flow of working fluid through the at least one flow control area of the main flow path. 13. The system of claim 12, comprising the fluid supply system, wherein the fluid supply system comprises an air supply, an inert gas supply, a carbon dioxide supply, or a combination thereof. 14. The system of claim 12, comprising the turbine, wherein the at least one fluid injection port is disposed on a turbine nozzle, a stator vane, a wall disposed about the main flow path, a shroud above a turbine blade, a stationary surface disposed along the main flow path, or any combination thereof. 15. The system of claim 14, wherein the turbine comprises a gas turbine. 16. The system of claim 12, wherein the controller has instructions to control the selective use of the one or more waste heat sources of the plurality of waste heat sources comprising at least two of a reactor, a gasifier, a syngas cooler, a gas treatment system, an air separation unit, a liquefaction system, or a gas turbine system having the turbine. 17. The system of claim 12, wherein the controller has instructions to control the selective use of the one or more waste heat sources of the plurality of waste heat sources to selectively adjust a parameter of each fluid flow of a plurality of fluid flows based on an injection location of each fluid flow into a different one of a plurality of flow control areas, the controller has instructions to control a valve along each fluid flow of the plurality of fluid flows, and the parameter comprises a pressure, a temperature, a fluid composition, or a combination thereof. 18. A method, comprising: flowing a working fluid along a main flow path through a turbine to drive a plurality of turbine blades disposed along the main flow path;selectively using one or more waste heat sources of a plurality of waste heat sources to provide a supply of a fluid from a fluid supply system to at least one fluid injection port fluidly coupled to the main flow path; andcontrolling the selective use of the one or more waste heat sources to provide the supply of the fluid to the at least one fluid injection port to adjust an effective area of the at least one flow control area. 19. The method of claim 18, wherein controlling the selective use of the one or more waste heat sources comprises using an external waste heat source external from a gas turbine system having the turbine, a combustor, and a compressor. 20. The method of claim 18, wherein the flow control area is disposed downstream from a final turbine stage of the turbine.