A closed-loop Brayton cycle system comprising: a first compressor configured to receive and compress all of a working fluid exiting a second recuperator; a first turbine comprising a plurality of turbine blades, the first turbine fluidly coupled to the first compressor, wherein each of the plurality of turbine blades include internal cooling features that are configured to receive a first portion of working fluid exiting the second recuperator and wherein the turbine is configured to receive and expand a second portion of the working fluid exiting a first recuperator; the first recuperator and the second recuperator positioned in a series arrangement between the first compressor and the first turbine, wherein the first recuperator and the second recuperator are connected end to end and are fluidly coupled to the first compressor and the first turbine such that the second recuperator is configured to receive all of the working fluid exiting the first compressor, and wherein the first recuperator is fluidly coupled through a conduit to the second recuperator and is configured to receive a second portion of the working fluid exiting the second recuperator, wherein the first recuperator and the second recuperator are further configured to receive the first portion of the working fluid exiting the turbine blades combined with the second portion of the working fluid being expanded within the first turbine such that all of the working fluid exiting the first turbine flows to and through the first recuperator, the second recuperator, and the first compressor; and a bleed channel comprising a bleed inlet and a bleed outlet, wherein the bleed inlet is fluidly coupled to the conduit at a location between the first recuperator and the second recuperator, and wherein the bleed outlet is fluidly coupled to the plurality of turbine blades to direct a bleed stream of a first portion of the working fluid exiting the second recuperator and flowing through the bleed channel into the internal cooling features of the plurality of turbine blades when the closed-loop Brayton cycle system is operating; wherein the closed-loop Brayton cycle system is configured to flow the working fluid through the closed-loop Brayton cycle system when in operation. a first compressor configured to receive and compress all of a working fluid exiting a second recuperator; a first turbine comprising a plurality of turbine blades, the first turbine fluidly coupled to the first compressor, wherein each of the plurality of turbine blades include internal cooling features that are configured to receive a first portion of working fluid exiting the second recuperator and wherein the turbine is configured to receive and expand a second portion of the working fluid exiting a first recuperator; the first recuperator and the second recuperator positioned in a series arrangement between the first compressor and the first turbine, wherein the first recuperator and the second recuperator are connected end to end and are fluidly coupled to the first compressor and the first turbine such that the second recuperator is configured to receive all of the working fluid exiting the first compressor, and wherein the first recuperator is fluidly coupled through a conduit to the second recuperator and is configured to receive a second portion of the working fluid exiting the second recuperator, wherein the first recuperator and the second recuperator are further configured to receive the first portion of the working fluid exiting the turbine blades combined with the second portion of the working fluid being expanded within the first turbine such that all of the working fluid exiting the first turbine flows to and through the first recuperator, the second recuperator, and the first compressor; and a bleed channel comprising a bleed inlet and a bleed outlet, wherein the bleed inlet is fluidly coupled to the conduit at a location between the first recuperator and the second recuperator, and wherein the bleed outlet is fluidly coupled to the plurality of turbine blades to direct a bleed stream of a first portion of the working fluid exiting the second recuperator and flowing through the bleed channel into the internal cooling features of the plurality of turbine blades when the closed-loop Brayton cycle system is operating; wherein the closed-loop Brayton cycle system is configured to flow the working fluid through the closed-loop Brayton cycle system when in operation.