Attachment scheme for a ceramic bulkhead panel
A turbine engine includes a compressor section, a combustor in fluid communication with the compressor section, and a turbine section in fluid communication with the combustor section. The combustor includes a combustor region defined by at least one bulkhead panel and at least one heat shielding panel inside the combustor region. The at least one heat shielding panel is connected to the bulkhead panel via at least one cooled fastener.
1. A turbine engine comprising:
a compressor section;
a combustor in fluid communication with the compressor section;
a turbine section in fluid communication with the combustor;
said combustor further comprises a combustor region defined by at least one bulkhead panel, and at least one heat shielding panel interior to said combustor region, wherein a first heat shielding panel of said at least one heat shielding panel is connected to a first bulkhead panel of said at least one bulkhead panel via at least one cooled fastener; and
the at least one cooled fastener comprises a fastener component defining an axis and including a cooling channel defined within the fastener component, a spring disposed about said at least one cooled fastener and providing axial loading to said at least one cooled fastener, thereby holding said first heat shielding panel in place relative to said first bulkhead panel, a cold side bushing disposed about said fastener component and at least partially within said spring, the cold side bushing including a flange member interfaced with said spring, and a hot side bushing disposed about said fastener component, wherein the hot side bushing interfaces with the first heat shielding panel and a head of the at least one cooled fastener to maintain the first heat shielding panel in position relative to the first bulkhead panel.
2. The turbine engine of claim 1 , wherein said combustor comprises a plurality of bulkhead panel including the first bulkhead panel, the at least one cooled fastener comprises a plurality of cooled fasteners, the at least one heat shielding panel comprises a plurality of heat shielding panels including the first heat shielding panel, and wherein each of said bulkhead panels of the plurality of bulkhead panels is connected to at least one heat shielding panel of the plurality of heat shielding panels via at least one cooled fastener of the plurality of cooled fasteners.
3. The turbine engine of claim 1 , wherein said cooling channel includes an opening on a first axial end of the fastener component, and at least one opening on a second axial end of the fastener component.
4. The turbine engine of claim 3 , wherein said cooling channel includes more than one opening on the second axial end of the fastener component.
5. The turbine engine of claim 1 , wherein said spring further interfaces with said first bulkhead panel on an end opposite said flange member.
6. The turbine engine of claim 1 , wherein A said hot side bushing is a washer positioned between said first bulkhead panel and said first heat shielding panel.
7. The turbine engine of claim 1 , wherein said hot side bushing has an L-shaped cross section and is at least partially positioned in a fastener hole in said first bulkhead panel.
8. The turbine engine of claim 1 , wherein said first bulkhead panel is metal and wherein said first heat shielding panel is a ceramic material.
9. The turbine engine of claim 1 , wherein a stem of each of said cooled fasteners extends through an oversized fastener hole in said first bulkhead panel and a hole in said first heat shielding panel.
10. The turbine engine of claim 9 , wherein said hole is shaped such that a head of said fastener component interfaces with the shaped hole.