FIELD

The present disclosure relates to gas turbine engines, and, more specifically, to a blade outer air seal of a turbine section or a compressor section.

BACKGROUND

A gas turbine engine may include a fan section, a compressor section, a combustor section, and a turbine section. A turbine in-use may become unstable and reach high speeds upon the occurrence of a high shaft failing. The turbine may be prevented from reaching excessive speeds using a combination of compressor surge, blade and vane airfoil intermeshing, fuel shutoff, or frictional braking from metal to metal contact of rotating and static hardware. However, if blade and vane intermeshing or fuel shutoff are not viable options, rotor overspeed should be otherwise sufficiently prevented or controlled.

SUMMARY

In various embodiments, a rotor overspeed protection (ROP) assembly of a gas turbine engine is provided. In various embodiments, the ROP assembly may comprise an annular blade outer air seal (BOAS) assembly comprising a ROP segment. In various embodiments, the ROP assembly may comprise a stator vane coupled with the BOAS assembly, the stator vane comprising a stator flange disposed about a forward edge portion of the stator vane. In various embodiments, the ROP segment comprises a ROP flange extending in an axially aft direction from a main body of the ROP segment toward the stator vane, wherein the ROP flange is disposed radially inward of the stator flange. In various embodiments, the BOAS assembly comprises a BOAS segment coupled with the ROP segment, the BOAS segment comprising a BOAS flange extending in an axially aft direction from a main body of the BOAS segment toward the stator vane, wherein the BOAS flange is disposed radially outward of the stator flange of the stator vane. In various embodiments, the ROP segment is coupled to a second ROP segment. In various embodiments, the second ROP segment disposed about 180 degrees from the ROP segment about the BOAS assembly. In various embodiments, the BOAS assembly comprises a plurality of ROP segments and a plurality of BOAS segments, wherein the plurality of ROP segments and the plurality of BOAS segments alternate about the BOAS assembly. In various embodiments, the BOAS assembly comprises a plurality of ROP segments disposed about 90 degrees apart about the BOAS assembly. In various embodiments, the stator flange is configured to contact the ROP flange in response to the stator vane rotating about a rear leg of the stator vane in an aft direction. In various embodiments, the BOAS assembly is comprised entirely of ROP segments.

In various embodiments, a gas turbine engine is provided. In various embodiments, the gas turbine engine may comprise a turbine section or a compressor section including a stator vane. In various embodiments, the gas turbine engine may comprise an annular blade outer air seal (BOAS) assembly comprising a ROP segment. In various embodiments, the gas turbine engine may comprise a stator vane coupled with the BOAS assembly, the stator vane comprising a stator flange disposed about a forward edge portion of the stator vane. In various embodiments, the gas turbine engine comprises a ROP flange extending in an axially aft direction from a main body of the ROP segment toward the stator vane, wherein the ROP flange is disposed radially inward of the stator flange. In various embodiments, the BOAS assembly comprises a BOAS segment coupled with the ROP segment, the BOAS segment comprising a BOAS flange extending in an axially aft direction from a main body of the BOAS segment toward the stator vane, wherein the BOAS flange is disposed radially outward of the stator flange of the stator vane. In various embodiments, the ROP segment is coupled to a second ROP segment. In various embodiments, the second ROP segment disposed about 180 degrees from the ROP segment about the BOAS assembly. In various embodiments, the BOAS assembly comprises a plurality of ROP segments and a plurality of BOAS segments, wherein the plurality of ROP segments and the plurality of BOAS segments alternate about the BOAS assembly. In various embodiments, the BOAS assembly comprises a plurality of ROP segments disposed about 90 degrees apart about the BOAS assembly. In various embodiments, the stator flange is configured to contact the ROP flange in response to the stator vane rotating about a rear leg of the stator vane in an aft direction. In various embodiments, the BOAS assembly is comprised entirely of ROP segments.

In various embodiments, a method of manufacturing a ROP assembly is provided. The method may comprise manufacturing a blade outer air seal (BOAS) assembly, wherein the BOAS assembly comprises a ROP segment. The method may comprise coupling a stator vane with the ROP segment, wherein the ROP segment comprises a ROP flange extending in an axially aft direction from a main body of the ROP segment toward the stator vane, wherein the ROP flange is disposed radially inward of a stator flange of the stator vane. The method may comprise coupling the BOAS assembly with an engine case structure of a gas turbine engine. The manufacturing the BOAS assembly may comprise coupling a first ROP segment to a first BOAS segment. The manufacturing the BOAS assembly may comprise coupling a first ROP segment to a second ROP segment.

The foregoing features and elements may be combined in various combinations without exclusivity, unless expressly indicated otherwise. These features and elements as well as the operation thereof will become more apparent in light of the following description and the accompanying drawings. It should be understood, however, the following description and drawings are intended to be exemplary in nature and non-limiting.

