Turbine shroud gas path duct interface
First Claim
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1. A sealing arrangement for a gas path of a turbine engine, the arrangement comprising:
- a static shroud assembly mounted to an engine case and having an axially-extending annular platform surrounding a rotatable airfoil array, the platform having an inner side and an outer side and extending from a leading edge to a trailing edge, the shroud platform having a circumferentially extending chamfer along the outer side at the platform trailing edge;
an annular duct extending downstream from the shroud platform trailing edge the shroud platform and the duct defining a portion of the engine main gas path, an axially extending annular gap provided between the shroud platform trailing edge and a leading end of the duct, the duct leading end having an inner side and an outer side, the duct having a circumferentially extending chamfer along the outer side at the leading end; and
a compliant annular seal extending between and engaging co-operating annular sealing faces provided by the shroud chamfer and the duct chamfer, thereby sealing the annular gap.
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Abstract
An arrangement for sealing a turbine shroud gas path duct interface of a turbine engine comprises a static shroud surrounding a rotatable airfoil array and an annular duct downstream of the shroud with respect to a gas flow passing through the gas path. The shroud and the duct define a portion of the gas path for directing the gas flow, having an axially extending interface gap between the shroud and duct. An annular seal in use engages both the shroud and the duct, thereby sealing the annular gap.
34 Citations
19 Claims
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1. A sealing arrangement for a gas path of a turbine engine, the arrangement comprising:
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a static shroud assembly mounted to an engine case and having an axially-extending annular platform surrounding a rotatable airfoil array, the platform having an inner side and an outer side and extending from a leading edge to a trailing edge, the shroud platform having a circumferentially extending chamfer along the outer side at the platform trailing edge; an annular duct extending downstream from the shroud platform trailing edge the shroud platform and the duct defining a portion of the engine main gas path, an axially extending annular gap provided between the shroud platform trailing edge and a leading end of the duct, the duct leading end having an inner side and an outer side, the duct having a circumferentially extending chamfer along the outer side at the leading end; and a compliant annular seal extending between and engaging co-operating annular sealing faces provided by the shroud chamfer and the duct chamfer, thereby sealing the annular gap. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A sealing arrangement for a gas path of a turbine engine, the arrangement comprising:
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a static shroud surrounding a rotatable airfoil array; an annular duct downstream of the shroud with respect to a gas flow passing through the gas path, the shroud and the duct defining a portion of the gas path for directing the gas flow, having an axially extending annular gap between the shroud and duct; an annular seal resiliently engaging both the shroud and the duct, thereby sealing the annular gap to prevent the gas flow from escaping from the gas path; and wherein the duct comprises an outer wall having a leading edge substantially aligning with the trailing edge of the shroud, the outer wall of the duct including a chamfer portion at an outer side of the leading edge to form an annular sealing face extending oblique with respect to a main axis of the engine, in order to create an interface fit with the seal. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17)
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- 18. A gas turbine engine static shroud comprising an annular platform configured to encircle a rotating airfoil array and having a trailing edge, the platform including a chamfer portion at an outer side of the trailing edge to form an annular sealing face for engaging with a seal substantially along a circumferential length of the sealing face, the further comprising a wall extending radially outwardly from the platform outer side configured for engaging a seal holder of the seal.
Specification