Platform for stator vane
A platform for a stator vane includes a platform body and a plug. The platform body defines: an inner surface, an outer surface offset from the inner surface, an internal fluid passageway disposed between the outer surface and the inner surface, and a core aperture extending from the outer surface to the internal fluid passageway. The plug 700 is configured to be secured to the platform body. The plug is configured to be partially disposed inside the core aperture and extend outside of the core aperture whilst secured to the platform body for improved heat transfer between a fluid conveyed by the internal fluid passageway and a fluid to which the outer surface is exposed.
1 . A platform for a stator vane, the platform including a platform body, a plug, and a further plug, wherein
the platform body defines:
an inner surface,
an outer surface offset from the inner surface,
an internal fluid passageway disposed between the outer surface and the inner surface,
a further internal fluid passageway disposed between the outer surface and the inner surface,
a further core aperture extending from the outer surface to the further internal fluid passageway, and
a core aperture extending from the outer surface to the internal fluid passageway;
the plug is configured to be secured to the platform body;
the plug:
is a single integral component,
is configured to be partially disposed inside the core aperture and extend outside of the core aperture whilst secured to the platform body for improved heat transfer between a fluid conveyed by the internal fluid passageway and a fluid to which the outer surface is exposed, and
extends outside of the core aperture into the internal fluid passageway;
the further plug is configured to be secured to the platform body and seal the further core aperture; and
the further plug is configured to be partially disposed inside the further core aperture and partially disposed outside the further core aperture whilst secured to the platform body for improved heat transfer between a fluid conveyed by the further internal fluid passageway and the fluid to which the outer surface of the platform body is exposed.
2 . The platform of claim 1 , wherein a lower portion of the plug is configured to extend into the internal fluid passageway whilst secured to the platform body to facilitate heat reception from the fluid conveyed by the internal fluid passageway.
3 . The platform of claim 2 , wherein the lower portion of the plug defines a plurality of heat exchange channels for improved heat exchange between the fluid conveyed by the internal fluid passageway and the plug.
4 . The platform of claim 1 , wherein an upper portion of the plug is configured to extend away from the outer surface of the platform body whilst the plug is secured to the platform body to facilitate heat rejection to the fluid to which the outer surface of the platform body is exposed.
5 . The platform of claim 1 , wherein an effective thermal conductivity of the plug is greater than an effective thermal conductivity of the platform body.
6 . The platform of claim 5 , wherein the effective thermal conductivity of the plug is no less than 50 W m −1 K −1 at 293 K and at atmospheric pressure.
7 . The platform of claim 1 , wherein:
the plug comprises a plug body;
the plug body is coated with a thermal coating; and
an effective thermal conductivity of the thermal coating is greater than an effective thermal conductivity of the plug body.
8 . The platform of claim 7 , wherein the effective thermal conductivity of the thermal coating is no less than 100 W m −1 K −1 at 293 K and at atmospheric pressure.
9 . The platform of claim 1 , wherein:
the plug comprises a plug body;
the plug body is coated with a thermal coating; and
an effective thermal emissivity of the thermal coating is greater than an effective thermal emissivity of the plug body.
10 . The platform of claim 9 , wherein the effective thermal emissivity of the thermal coating is no less than 0.05.
11 . The platform of claim 1 , wherein the plug is configured to occupy no less than 50% of the core aperture by volume whilst secured to the platform body to at least partially eliminate recirculation of the fluid conveyed by the internal fluid passageway within the core aperture.
12 . The platform of claim 11 , wherein the plug is configured to occupy no less than 75% of the core aperture by volume.
13 . The platform of claim 1 , wherein the core aperture is formed as a result of casting of the platform body over a supporting structure.
14 . The platform of claim 1 , wherein the plug is configured to be fixed to the platform body and seal the core aperture.
15 . The platform of claim 1 , wherein the plug and the further plug are joined by a bridging portion to form a combined plug structure.
16 . A stator vane comprising an aerofoil fixed to the platform of claim 1 .
17 . A turbine stage for a gas turbine engine, the turbine stage comprising the platform of claim 1 , or the stator vane comprising the aerofoil fixed to the platform of claim 1 .
18 . A gas turbine engine comprising the platform of claim 1 , the stator vane comprising the aerofoil fixed to the platform of claim 1 , or the turbine stage for a gas turbine engine, the turbine stage comprising the platform of claim 1 , or the stator vane comprising the aerofoil fixed to the platform of claim 1 , wherein the internal fluid passageway is configured to convey air received from a compressor stage of the gas turbine engine.
19 . An aircraft comprising the gas turbine engine of claim 18 .
20 . The platform of claim 1 , wherein the platform body includes protrusions in contact with the plug.
21 . A platform for a stator vane, the platform including a platform body and a plug, wherein the platform body defines: an inner surface, an outer surface offset from the inner surface, an internal fluid passageway disposed between the outer surface and the inner surface, and a core aperture extending from the outer surface to the internal fluid passageway; the plug is configured to be secured to the platform body; the plug: is a single integral component, is configured to be partially disposed inside the core aperture and extend outside of the core aperture whilst secured to the platform body for improved heat transfer between a fluid conveyed by the internal fluid passageway and a fluid to which the outer surface is exposed, and extends outside of the core aperture into the internal fluid passageway; and the platform body includes protrusions in contact with the plug.