Additively manufactured thermally insulating structure

1. An assembly for a gas turbine engine, comprising:

a turbine wheel within a housing, the turbine wheel mounted on a rotor shaft, the rotor shaft rotationally mounted within the static structure around the longitudinal axis, the turbine wheel comprising compressor blades facing toward the forward housing and turbine blades facing toward the exhaust pipe;

an additively manufactured base layer that at least partially forms a static structure of a gas turbine engine along a longitudinal axis; and

a fire-resistant layer additively manufactured to the additively manufactured base layer to form an additively manufactured thermally insulating structure, the additively manufactured fire-resistant layer and the additively manufactured base layer forming an air gap therebetween, wherein the air gap forms an intake, a duct, and an exhaust to define a bypass duct that extends along a direction of the longitudinal axis such that an airflow is communicable through the additively manufactured thermally insulating structure to provide active cooling via airflow through the bypass duct along an axial length of the gas turbine engine, wherein the intake is positioned forward of the compressor blades and the bypass duct and the longitudinal axis extend within a common plane.

2. The assembly as recited in claim 1 , wherein the additively manufactured base layer is 0.1-0.2 inches thick and the fire-resistant layer is 0.1-0.2 inches thick.

3. The assembly as recited in claim 1 , wherein the air gap is 0.25-0.5-inch thick.

4. The assembly as recited in claim 1 , further comprising a lattice structure within the air gap.

5. A gas turbine engine, comprising:

a base layer that forms a static structure that comprises at least one of a forward housing, a combustor housing, and an exhaust pipe along a longitudinal axis;

a turbine wheel within the combustor housing, the turbine wheel mounted on a rotor shaft, the rotor shaft rotationally mounted within the static structure about the longitudinal axis, the turbine wheel comprising compressor blades facing toward the forward housing and turbine blades facing toward the exhaust pipe; and

an additively manufactured fire-resistant layer additively manufactured to the base layer to form an additively manufactured thermally insulating structure, the additively manufactured fire-resistant layer and the base layer forming an air gap therebetween, wherein the air gap forms an intake, a duct, and an exhaust to define a bypass duct that extends along a direction of the longitudinal axis such that an airflow is communicable through the additively manufactured thermally insulating structure to provide active cooling via airflow through the bypass duct, wherein the intake is positioned forward of the compressor blades and the bypass duct and the longitudinal axis extend within a common plane.

6. The gas turbine engine as recited in claim 5 , wherein the fire-resistant layer forms a pattern which facilitates fire resistance.

7. The gas turbine engine as recited in claim 5 , wherein the air gap contains a lattice structure.

8. The gas turbine engine as recited in claim 5 , wherein the gas turbine engine is 1000 pound-force (lbf) thrust or smaller.

9. A gas turbine engine, comprising:

an additively manufactured base layer that at least partially forms a static structure of the gas turbine engine along a longitudinal axis, the static structure comprising components including at least one of a forward housing, a combustor housing, and an exhaust pipe;

a turbine wheel within the combustor housing, the turbine wheel mounted on a rotor shaft, the rotor shaft rotationally mounted within the static structure around the longitudinal axis, the turbine wheel comprises compressor blades facing toward the forward housing and turbine blades facing toward the exhaust pipe; and

an additively manufactured fire-resistant layer additively manufactured to the additively manufactured base layer to form an additively manufactured thermally insulating structure, the additively manufactured fire-resistant layer and the additively manufactured base layer forming an air gap therebetween, wherein the air gap forms an intake, a duct, and an exhaust to define a bypass duct that extends along a direction of the longitudinal axis such that an airflow is communicable through the additively manufactured thermally insulating structure to provide active cooling via airflow through the bypass duct, wherein the intake is positioned forward of the compressor blades and the bypass duct and the longitudinal axis extend within a common plane.

10. The gas turbine engine as recited in claim 9 , wherein the gas turbine engine is 1000 pound-force (lbf) thrust and or smaller.

11. The gas turbine engine as recited in claim 10 , wherein the fire-resistant layer forms a pattern which facilitates fire resistance.

12. The gas turbine engine as recited in claim 10 , wherein the duct includes multiple intakes and exhausts.

13. The gas turbine engine as recited in claim 10 , wherein the additively manufactured thermally insulating structure is integrated onto each component of the static structure individually to facilitate assembly and disassembly.

14. A method for assembling a gas turbine engine, comprising:

additively manufacturing a base layer that at least partially forms a static structure of the gas turbine engine along a longitudinal axis, the static structure comprising components including at least one of a forward housing, a combustor housing, and an exhaust pipe; and

additively manufacturing a fire-resistant layer onto the additively manufactured base layer to form an additively manufactured thermally insulating structure, the additively manufactured fire-resistant layer and the additively manufactured base layer forming an air gap therebetween, the air gap forming an intake, a duct, and an exhaust to define a bypass duct that extends along a direction of the longitudinal axis such that an airflow is communicable through the additively manufactured thermally insulating structure to provide active cooling via airflow through the bypass duct, the additively manufactured fire-resistant layer comprising an outer surface and a pattern on the outer surface to facilitate fire resistance,

wherein a turbine wheel is positioned within the combustor housing, the turbine wheel is mounted on a rotor shaft, the rotor shaft is rotationally mounted within the static structure around the longitudinal axis, and the turbine wheel comprises compressor blades facing toward the forward housing and turbine blades facing toward the exhaust pipe,

wherein the intake is positioned forward of the compressor blades, and

the bypass duct and the longitudinal axis extend within a common plane.

15. The method as recited in claim 14 , wherein additively manufacturing the base layer comprises additively manufacturing at least one of a forward housing, a combustor housing, and an exhaust pipe.

16. The method as recited in claim 14 , further comprising additively manufacturing a lattice structure into the air gap.

17. The gas turbine engine as recited in claim 5 , wherein the gas turbine engine is attritable.