Cooling air supply through bolted flange assembly

A gas turbine engine rotor assembly comprising:

• axially spaced apart forward and aft disks circumferentially disposed about an axis,
• said forward disk having an aftwardly extending annular forward arm,
• said aft disk having a forwardly extending annular aft arm,
• forward and aft flanges at forward and aft ends of said forward and aft arms respectively,
• said forward and aft flanges having respective forward and aft pluralities of aligned forward and aft bolt holes extending axially therethrough,
• a scalloped annular ring having a plurality of circumferentially spaced apart tabs with spaces therebetween is disposed between said forward and aft flanges,
• a plurality of ring bolt holes extending axially through said plurality of circumferentially spaced apart tabs such that corresponding ones of said ring, forward, and aft bolt holes are axially aligned,
• at least a first one of said flanges having a first plurality of apertures extending axially therethrough, and
• and said spaces are in fluid flow communication with corresponding ones of said apertures.

A gas turbine engine turbine rotor assembly, said assembly comprising:

• axially spaced apart forward and aft disks having annular outer forward and aft rims attached by annular forward and aft webs to annular forward and aft bores and circumferentially disposed about an axis,
• an annular interstage seal extending between said forward and aft disks,
• an annular forward arm extending aftwardly from said forward web,
• an annular aft arm extending forwardly from said aft web,
• forward and aft flanges removably attached to each other at forward and aft ends of said forward and aft arms respectively forming a radially outer annular interstage volume extending radially between said forward and aft flanges and said interstate seal and a radially inner annular interstate volume extending radially inwardly of said forward and aft flanges,
• a means for passing cooling air between said forward and aft flanges from said inner annular interstage volume to said outer annular interstate volume,
• forward and aft pluralities of aligned forward and aft bolt holes extending axially through said forward and aft flanges respectively, and
• wherein said means for passing cooling air between said forward and aft flanges comprises;
• a scalloped annular ring having a plurality of circumferentially spaced apart tabs with spaces therebetween is disposed between said forward and aft flanges,
• a plurality of ring bolt holes extending axially through said plurality of circumferentially spaced apart tabs such that corresponding ones of said ring, forward, and aft bolt holes are axially aligned,
• a plurality of ring bolt holes extending axially through said corresponding ones of said plurality of circumferentially spaced apart tabs such that corresponding ones of said ring, forward, and aft bolt holes are axially aligned, and
• and said spaces are in fluid flow communication with corresponding ones of said apertures.