Turbine engine seal for turbine engines
A turbine engine seal configured for use between a turbine engine rotor and a turbine engine static component of a turbine engine can include a seal construction having a negative thermal expansion (NTE) layer located on one or both of the turbine engine rotor and turbine engine static component. The NTE layer can include a NTE reactive component comprising a material with a negative thermal expansion coefficient. When the turbine engine rotor rubs against the turbine engine static component, heat is generated and the NTE reactive component can experience an increase in temperature from a first temperature to a second temperature. The increase in temperature causes a dimension of the NTE reactive component to decrease which consequently forms a hydrodynamic pocket useful to generate a lift force that urges separation between the turbine engine rotor and turbine engine static component. The seal construction can include a lattice compliant layer.
1 . A turbine engine seal, comprising: a seal construction configured to be positioned between a turbine engine rotor and a turbine engine static component, the seal construction comprising: a seal body having a thickness that extends in a radial direction between a first seal side and a second seal side; and a negative thermal expansion (NTE) layer disposed on the second seal side, the NTE layer configured to react to a change in temperature and including a NTE reactive component comprising a material having a negative thermal expansion coefficient; and
wherein the seal body further includes a lattice compliant layer disposed within the first seal side and a second seal side.
2 . The turbine engine seal of claim 1 , the NTE layer further comprising a NTE base that extends in the radial direction between a first base side and a second base side, the NTE base comprising a material having a different thermal expansion coefficient than the NTE reactive component, the NTE base having a channel, wherein the NTE reactive component is disposed in the channel.
3 . The turbine engine seal of claim 2 , wherein the channel of the NTE base includes a plurality of channels, wherein the NTE reactive component includes a plurality of NTE reactive components, and wherein each channel of the plurality of channels including a respective NTE reactive component of the plurality of NTE reactive components, and wherein the plurality of channels are dispersed circumferentially along an arc of the NTE base.
4 . The turbine engine seal of claim 2 , wherein the channel extends in a piecewise linear configuration along an arc of the NTE base.
5 . The turbine engine seal of claim 2 , wherein the channel extends as a repeating chevron shape along an arc of the NTE base.
6 . The turbine engine seal of claim 2 , wherein the channel includes a first sidewall and a second sidewall, the first sidewall opposing the second sidewall.
7 . The turbine engine seal of claim 6 , wherein during operation of the seal construction, an increase in a temperature of the NTE reactive component causes the NTE reactive component to decrease in size from a first size to a second size, wherein the decrease in size of the NTE reactive component increases a size of a hydrodynamic pocket formed between the first sidewall and the second sidewall.
8 . The turbine engine seal of claim 1 , wherein the NTE layer defines a groove having a first groove sidewall and a second groove sidewall, and wherein a hydrodynamic pocket is formed between the first groove sidewall and the second groove sidewall.
9 . The turbine engine seal of claim 8 , wherein the hydrodynamic pocket extends circumferentially along an arc of an NTE base.
10 . The turbine engine seal of claim 8 , wherein the hydrodynamic pocket extends circumferentially in a shape of a chevron.
11 . The turbine engine seal of claim 1 , further comprising a wear resistant base layer coupled between the first seal side and the NTE layer.
12 . A rotary machine, comprising: a turbine engine rotor of a turbine engine having a negative thermal expansion (NTE) layer configured to dimensionally react when the NTE layer experiences a rise in temperature from a first temperature to a second temperature, the NTE layer defining at least part of a hydrodynamic pocket formed at the second temperature of the NTE layer; and wherein a seal body further includes a lattice compliant layer disposed within the seal body between a first seal body side and a second seal body side.
13 . The rotary machine of claim 12 , the NTE layer further comprising a NTE base having a thickness that extends in a radial direction between a first base side and a second base side, the NTE base having a channel, wherein the channel extends partially into the thickness of the NTE layer.
14 . The rotary machine of claim 13 , wherein the channel includes a first sidewall, a second sidewall, and a sidewall bridge extending between the first sidewall and the second sidewall, wherein the first sidewall is located opposite the second sidewall, and wherein an NTE reactive component is disposed in the channel.
15 . The rotary machine of claim 14 , wherein the NTE reactive component is contoured along the first sidewall, the second sidewall, and the sidewall bridge.
16 . The rotary machine of claim 14 , wherein the NTE reactive component is disposed as a constant thickness along each of the first sidewall, the second sidewall, and the sidewall bridge.
17 . The rotary machine of claim 12 , wherein the lattice compliant layer includes a plurality of lattice ligaments each extending between adjacent nodes of a plurality of nodes.
18 . The rotary machine of claim 17 , wherein the lattice compliant layer includes a plurality of cavities defined by the plurality of lattice ligaments.
19 . The rotary machine of claim 18 , wherein the plurality of cavities includes a first lattice layer and a second lattice layer, the first lattice layer located radially offset from the second lattice layer.