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According to an example embodiment, a gas turbine engine assembly includes, among other things, a compressor. A strut near the compressor includes a flow passage through a portion of the strut. The flow passage is configured to direct air from the compressor to another portion of the gas turbine eng

According to an example embodiment, a gas turbine engine assembly includes, among other things, a compressor. A strut near the compressor includes a flow passage through a portion of the strut. The flow passage is configured to direct air from the compressor to another portion of the gas turbine engine. The flow passage has at least one surface feature that at least partially hinders some airflow through the flow passage.

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1. A gas turbine engine assembly, comprising: a compressor (52);a combustor fluidly connected to the compressor via a primary flowpath; anda strut (100) downstream of the compressor and upstream of the combustor, the strut spans from an inner wall of the primary flowpath to an outer wall of the prim

1. A gas turbine engine assembly, comprising: a compressor (52);a combustor fluidly connected to the compressor via a primary flowpath; anda strut (100) downstream of the compressor and upstream of the combustor, the strut spans from an inner wall of the primary flowpath to an outer wall of the primary flowpath in a radial direction, and the strut including a flow passage (102) through a portion of the strut, the flow passage being configured to direct air (104) from the compressor to another portion (54) of the gas turbine engine, the flow passage having at least one surface feature (120) that at least partially augments heat transfer within the flow passage, and wherein the strut (100) is operative as a heat exchanger such that at least some air entering the flow passage has a higher temperature than at least some air exiting the flow passage. 2. The assembly of claim 1, wherein the at least one surface feature (120) comprises a rough surface (140) within the flow passage. 3. The assembly of claim 1, wherein the at least one surface feature (120) comprises a baffle within the flow passage. 4. The assembly of claim 3, wherein the flow passage has a cross-sectional dimension (d) in a direction that is transverse to a primary direction of airflow through the flow passage;the baffle comprises a plurality of walls (122) within the flow passage;each of the walls has a length (L) oriented transverse to the primary direction (104, 106) of airflow; andthe length (L) is less than the cross-sectional dimension (d). 5. The assembly of claim 3, wherein the baffle comprises a plurality of posts (132) situated in the flow passage; andeach of the posts has a length oriented transverse to a direction of airflow through the flow passage. 6. The assembly of claim 3, wherein the baffle comprises an insert (128) that is situated within a portion of the strut that includes the flow passage. 7. The assembly of claim 3, wherein the baffle establishes a tortuous path (124) for airflow through the flow passage. 8. The assembly of claim 1, wherein the at least one surface feature provides an increased surface area for contacting at least some airflow through the flow passage. 9. The assembly of claim 1, wherein said another portion of the gas turbine engine comprises a high pressure turbine. 10. The assembly of claim 1, wherein the strut comprises a pre-diffuser strut. 11. The assembly of claim 1, wherein the strut is configured to structurally support said primary flowpath. 12. A pre-diffuser assembly, comprising: a strut (100) configured to span from an inner wall of a primary flowpath of a gas turbine engine to an outer wall of the primary flowpath in a radial direction of the gas turbine engine, and the strut including a flow passage (102) through a portion of the strut, the flow passage being configured to direct air from a compressor (52) to another portion (54) of the gas turbine engine, the strut configured in a position downstream of the compressor and upstream of a combustor of the gas turbine engine, the flow passage having at least one surface feature (120) that provides an increased surface area for contacting at least some airflow through the flow passage, wherein the strut (100) is operative as a heat exchanger such that at least some air entering the flow passage has a higher temperature than at least some air exiting the flow passage. 13. The assembly of claim 12, wherein the at least one surface feature comprises a rough surface (140) within the flow passage. 14. The assembly of claim 12, wherein the at least one surface feature (120) comprises a baffle within the flow passage. 15. The assembly of claim 14, wherein the flow passage has a cross-sectional dimension (d) in a direction that is transverse to a primary direction of airflow through the flow passage;the baffle comprises a plurality of walls (122) within the flow passage;each of the walls has a length (L) oriented transverse to the primary direction (104, 106) of airflow; andthe length (L) is less than the cross-sectional dimension (d). 16. The assembly of claim 14, wherein the baffle comprises a plurality of posts (132) situated in the flow passage; andeach of the posts has a length along a direction that is transverse to a direction of airflow through the flow passage. 17. The assembly of claim 14, wherein the baffle comprises an insert (128) that is situated within a portion of the strut (100) that includes the flow passage. 18. The assembly of claim 14, wherein the baffle establishes a tortuous path (124) for airflow through the flow passage. 19. The assembly of claim 14, wherein the at least one surface feature at least partially augments heat transfer within the flow passage. 20. The assembly of claim 12, wherein said another portion of the gas turbine engine comprises a high pressure turbine.