초록 ▼

A bleed case assembly is provided comprising an annular outer case and an inner case. The inner case comprises an annular shroud portion having a radially outer surface opposite a radially inner surface, and a generally planar flange extending radially outwardly from the radially outer surface. The

A bleed case assembly is provided comprising an annular outer case and an inner case. The inner case comprises an annular shroud portion having a radially outer surface opposite a radially inner surface, and a generally planar flange extending radially outwardly from the radially outer surface. The flange includes a circumferential array of bleed openings formed therethrough. The flange is attached to the outer case so as to reduce the thermal response of the inner case.

대표청구항 ▼

1. A bleed case assembly, comprising:an annular outer case having an aft wall; andan inner case comprising:an annular shroud portion having a radially facing outer surface opposite a radially facing inner surface and a forward wall extending between said inner surface and said outer surface; anda fl

1. A bleed case assembly, comprising:an annular outer case having an aft wall; andan inner case comprising:an annular shroud portion having a radially facing outer surface opposite a radially facing inner surface and a forward wall extending between said inner surface and said outer surface; anda flange extending radially outwardly from said outer surface at a location aft of said forward wall, said flange including a circumferential array of bleed openings formed therethrough;wherein said flange is attached to said outer case so that an annular bleed slot is defined by said forward wall and said aft wall. 2. The bleed case assembly of claim 1, wherein said flange of said inner case includes a circumferential array of mounting holes formed therethrough, radially outward of said bleed openings. 3. The bleed case assembly of claim 1 further comprising an abradable material disposed on said inner surface of said shroud portion. 4. The bleed case assembly of claim 1 further comprising a circumferential groove formed in an aft end of said shroud portion. 5. The bleed case assembly of claim 1 wherein said forward wall is disposed at an acute angle to said inner surface. 6. A case for a gas turbine engine, comprising:an annular shroud portion having a radially facing outer surface opposite a radially facing inner surface and a forward wall extending between said inner surface and said outer surface, said forward wall being disposed at an acute angle to said inner surface; anda flange extending radially outwardly from said outer surface at a location aft of said forward wall, said flange including:a circumferential array of bleed openings formed therethrough, radially adjacent said shroud portion, anda circumferential array of mounting holes formed therethrough, radially outward of said bleed openings. 7. The case of claim 6 further comprising an abradable material disposed on said radially inner surface of said shroud portion. 8. The case of claim 6 further comprising a circumferential groove formed in an aft end of said shroud portion. 9. A compressor assembly comprising:a rotor having a plurality of radially outwardly extending blades attached thereto;an annular outer case having an aft wall; andan annular inner case including:a first shroud portion surrounding said blades, said first shroud portion having a radially facing inner surface opposite a radially facing outer surface, said inner and outer surfaces being connected by a forward wall, anda flange which extends radially outward from said outer surface, said flange being connected to said outer case, aligned with the axial position of said blades, and having a plurality of bleed openings formed therethrough;wherein said inner case is disposed in spaced-apart relationship from said outer case so that an annular bleed slot is defined between said aft wall of said outer case and said forward wall of said first shroud portion of said inner case. 10. The compressor assembly of claim 9 further comprising:a stator row comprising a plurality of radially inwardly extending stator vanes, each of said vanes including an annular band having forward and aft ends; andan annular aft case including an axially forward extending arm connected to a radially inwardly extending arm, said radially inwardly extending arm including an annular second shroud portion;wherein said stator row is disposed between said first shroud portion of said inner case and said second shroud portion of said aft case. 11. The compressor assembly of claim 10 wherein each of said annular bands includes:a forward rail disposed at said forward end of said annular band, said forward rail being received in a circumferential groove formed in said first shroud portion; andan aft rail disposed at said aft end of said annular band, said aft rail being received in a circumferential groove formed in said second shroud portion. 12. The compressor assembly of claim 11 further comprising an annular seal disposed around said stator row. 13. The compressor assembly of claim 9 further comprising an abradable material disposed on said radially inner surface of said first shroud portion. 14. The compressor assembly of claim 9 wherein said forward wall is disposed at an acute angle to said inner surface.