Panel burn through tolerant shell design
A dual wall liner for a gas turbine engine may comprise a shell having a first side and a second side, a panel contacting the shell, the panel at least partially defining a hot gas path through which a hot gas flows, wherein the first side of the shell faces the panel, wherein the shell includes a thermal barrier coating (TBC) disposed on the first side of the shell. The TBC may thermally protect the shell from heat from a hot gas path.
1. A dual wall liner of a gas turbine engine combustor, comprising:
a shell having a first side and a second side opposite the first side, the shell comprises a shell material;
a panel contacting the shell, the panel at least partially defining a hot gas path through which a hot combustion gas flows, wherein the first side of the shell faces the panel and the hot gas path;
a metallic layer disposed on the shell material on the first side of the shell;
a thermal barrier coating (TBC) disposed on the metallic layer;
a first heat transfer augmentation feature extending from the second side of the shell, the first heat transfer augmentation feature comprising a trip strip; and
a second heat transfer augmentation feature extending from the second side of the shell, the second heat transfer augmentation feature comprising a cooling fin;
wherein a shape of the first heat transfer augmentation feature is different from a shape of the second heat transfer augmentation feature and a height of the cooling fin is greater than a height of the trip strip.
2. The dual wall liner of claim 1 , wherein the shell is configured to prevent oxidation of the metallic laver.
3. The dual wall liner of claim 2 , wherein the TBC comprises a lower thermal conductivity than that of the shell material, wherein the thermal conductivity of the TBC and the thermal conductivity of the shell material are both measured under common predetermined reference conditions.
4. The dual wall liner of claim 3 , wherein the thermal conductivity of the TBC is less than half of that of the shell material at the common predetermined reference conditions.
5. The dual wall liner of claim 1 , wherein a panel stud of the panel extends through the TBC.
6. The dual wall liner of claim 1 , further comprising a plurality of holes extending through the shell and the TBC, wherein the plurality of holes are configured to direct a flow of cooling air from the second side of the shell to the panel.
7. The dual wall liner of claim 1 , wherein the first side of the shell TBC is covered by the panel.
8. The dual wall liner of claim 2 , wherein the shell is configured to prevent corrosion of the metallic layer.
9. The dual wall liner of claim 1 , wherein the first heat transfer augmentation feature is configured to increase a surface area of the second side, and the second heat transfer augmentation feature is configured to disturb a flow of cooling air flowing across the second side.
10. A gas turbine engine combustor, comprising:
a shell having a first side and a second side opposite the first side, the shell comprises a shell material;
a panel contacting the shell, the panel at least partially defining a hot gas path through which a hot combustion gas flows, wherein the first side of the shell faces the panel and the hot gas path;
a metallic layer disposed on the shell material on the first side of the shell;
a thermal barrier coating (TBC) disposed on the metallic layer;
a first heat transfer augmentation feature extending from the second side of the shell, the first heat transfer augmentation feature comprising a trip strip; and
a second heat transfer augmentation feature extending from the second side of the shell, the second heat transfer augmentation feature comprising a cooling fin;
wherein a shape of the first heat transfer augmentation feature is different from a shape of the second heat transfer augmentation feature and a height of the cooling fin is greater than a height of the trip strip.
11. The gas turbine engine combustor of claim 10 , wherein the panel is coupled to the shell.
12. The gas turbine engine combustor of claim 10 , wherein:
the shell is configured to prevent oxidation of the metallic layer; and
the TBC comprises a lower thermal conductivity than that of the shell material, measured under common predetermined reference conditions.
13. The gas turbine engine combustor of claim 11 , further comprising a panel stud coupling the panel to the shell, wherein the panel stud extends through the TBC.
14. The gas turbine engine combustor of claim 11 , further comprising a plurality of holes extending through the shell and the TBC, wherein the plurality of holes are configured to direct a flow of cooling air from the second side of the shell to the panel.
15. The gas turbine engine combustor of claim 10 , further comprising: a panel stud coupling the panel to the shell, wherein the TBC is provided locally around the panel stud, and the TBC surrounds at least a portion of the panel stud.