Systems and methods for high volumetric oxidant flow in gas turbine engine with exhaust gas recirculation

A system, comprising:

• an end cover assembly configured to mount at a head end of a turbine combustor, wherein the end cover assembly comprises:
• an oxidant inlet configured to receive an oxidant flow;
• a central oxidant passage in fluid communication with the oxidant inlet, wherein the central oxidant passage is configured to route the oxidant flow to one or more fuel nozzles;
• a baffle assembly comprising a baffle channel defined by a baffle shell that is disposed about a downstream end of the central oxidant passage, wherein the baffle channel is in fluid communication with the central oxidant passage, the baffle shell comprises a plurality of oxidant apertures disposed through a wall of the baffle shell, the plurality of oxidant apertures is configured to distribute the oxidant flow into a plurality of streams of oxidant flows, and the baffle assembly is configured to route one or more of the plurality of streams of oxidant flows into the one or more fuel nozzles via oxidant ports in the one or more fuel nozzles;
• and
• at least one fuel supply passage configured to receive a fuel flow, wherein the at least one fuel supply passage is configured to route the fuel flow into the one or more fuel nozzles.

A method, comprising:

• receiving an oxidant flow into an oxidant inlet of an end cover assembly of a turbine combustor of a gas turbine engine;
• routing the oxidant flow from the oxidant inlet through a central oxidant passage in the end cover assembly;
• routing the oxidant flow through a downstream end of the central oxidant passage into a baffle assembly defined by a baffle shell disposed about the downstream end of the central oxidant passage;
• routing the oxidant flow through a plurality of oxidant apertures disposed through the baffle shell as a plurality of streams of oxidant flows;
• and
• distributing one or more of the plurality of streams of oxidant flows from the plurality of oxidant apertures into a plurality of fuel nozzles via oxidant ports in the one or more fuel nozzles.