Turbine plant compressor disc with centripetal accelerator for the induction of turbine cooling air

A turbine plant compressor disc provided with an integrated centripetal accelerator for the induction of turbine cooling air from the compressor, wherein said disc is formed by

• two disc-halves disposed upstream and downstream with respect to the axis of rotation of said disc, said disc-halves being secured together to define an internal space therebetween in a plane of said disc perpendicular to said disc axis and having inner faces bounding said internal space,
• said disc having
• means defining a central bore through said disc,
• an outer peripheral rim for forming part of a compressor drum and adapted to receive the roots of a peripheral array of compressor blades, and
• a plurality of peripherally spaced air off-take passages through said rim on the downstream side of said disc, and wherein said centripetal accelerator comprises
• a plurality of sectors removably mounted in said internal space of said disc and forming a perforated circular member disposed in said central bore of said disc, each of said sectors having
• a flat web extending radially outwards in said internal space of said disc, and each pair of adjacent webs forming with said inner faces of said disc-halves a radial channel communicating with one of said air off-take passages in said rim of said disc.