Supercritical CO

1. A gas turbine engine comprising:

a compressor section;

a combustor section;

a turbine section;

a nozzle section, wherein the compressor section, the combustor section, the turbine section, and the nozzle section define a core flow path that expels through the nozzle section; and

a waste heat recovery system comprising:

a heat recovery heat exchanger arranged at the nozzle section, wherein the heat recovery heat exchanger is arranged within the nozzle section such that the heat recovery heat exchanger occupies less than an entire area of an exhaust area of the nozzle section; and

a heat rejection heat exchanger arranged to reduce a temperature of a working fluid of the waste heat recovery system,

wherein the heat recovery heat exchanger comprises a plurality of heat exchanger portions distributed about the nozzle section in a non-annular arrangement.

2. The gas turbine engine of claim 1 , wherein the waste heat recovery system includes a supercritical CO 2 (sCO 2 ) work recovery cycle system.

3. The gas turbine engine of claim 1 , wherein a portion of the heat recovery heat exchanger is located within a strut of the nozzle section.

4. The gas turbine engine of claim 1 , wherein a portion of the heat recovery heat exchanger is located on or within a tail cone of the nozzle section.

5. The gas turbine engine of claim 1 , wherein a portion of the heat recovery heat exchanger is located on or within a nozzle case of the nozzle section.

6. The gas turbine engine of claim 1 , wherein the waste heat recovery system further comprises:

a turbine; and

a compressor,

wherein the turbine and the compressor of the waste heat recovery system are configured to generate work.

7. The gas turbine engine of claim 6 , further comprising a power line operably connected to an output of the turbine of the waste heat recovery system.

8. The gas turbine engine of claim 1 , wherein the heat recovery heat exchanger occupies 80% or less of an exhaust area of the nozzle section, wherein the exhaust area is defined as the area between an external surface of a tail cone of the nozzle section and an internal surface of a nozzle case of the nozzle section.

9. The gas turbine engine of claim 1 , wherein the plurality of heat exchanger portions of the heat recovery heat exchanger include at least (i) one portion located within a strut of the nozzle section, (ii) one portion located on or within a tail cone of the nozzle section, and (iii) one portion located on or within a nozzle case of the nozzle section.

10. The gas turbine engine of claim 1 , wherein the waste heat recovery system further comprises a recuperating heat exchanger.

11. A gas turbine engine comprising:

a nozzle section; and

a waste heat recovery system comprising:

a heat rejection heat exchanger thermally connected to a portion of a flow path of the gas turbine engine, the heat rejection heat exchanger being a working fluid-to-air heat exchanger;

a recuperating heat exchanger being a working fluid-to-working fluid heat exchanger;

a heat recovery heat exchanger arranged at the nozzle section, wherein the heat recovery heat exchanger is a working fluid-to-exhaust heat exchanger, and wherein the heat recovery heat exchanger is arranged within the nozzle section such that the heat recovery heat exchanger occupies less than an entire area of an exhaust area of the nozzle section; and

a working fluid within the waste heat recovery system configured to flow through each of the heat rejection heat exchanger, the recuperating heat exchanger, and the heat recovery heat exchanger,

wherein the heat recovery heat exchanger comprises a plurality of heat exchanger portions distributed about the nozzle section in a non-annular arrangement.

12. The gas turbine engine of claim 11 , wherein the working fluid is supercritical CO 2 (sCO 2 ).

13. The gas turbine engine of claim 11 , wherein a portion of the heat recovery heat exchanger is located within a strut of the nozzle section.

14. The gas turbine engine of claim 11 , wherein a portion of the heat recovery heat exchanger is located on or within a tail cone of the nozzle section.

15. The gas turbine engine of claim 11 , wherein a portion of the heat recovery heat exchanger is located on or within a nozzle case of the nozzle section.

16. The gas turbine engine of claim 11 , wherein the waste heat recovery system further comprises:

a turbine; and

a compressor,

wherein the turbine and the compressor of the waste heat recovery system are configured to generate work.

17. The gas turbine engine of claim 16 , further comprising a power line operably connected to an output of the turbine of the waste heat recovery system.

18. The gas turbine engine of claim 11 , wherein the heat recovery heat exchanger occupies 80% or less of an exhaust area of the nozzle section, wherein the exhaust area is defined as the area between an external surface of a tail cone of the nozzle section and an internal surface of a nozzle case of the nozzle section.

19. The gas turbine engine of claim 11 , wherein the plurality of heat exchanger portions of the heat recovery heat exchanger include at least (i) one portion located within a strut of the nozzle section, (ii) one portion located on or within a tail cone of the nozzle section, and (iii) one portion located on or within a nozzle case of the nozzle section.

20. The gas turbine engine of claim 11 , further comprising:

a compressor section;

a combustor section; and

a turbine section,

wherein the compressor section, the combustor section, the turbine section, and the nozzle section define a core flow path that expels through the nozzle section.