Two stage rotor assembly with improved coolant flow

Details Two stage rotor assembly with improved coolant flow Two stage rotor assembly with improved coolant flow

F - Mech Eng,Light,Heat,Weapons

02

C

170/68

F02C 7/12 (2006.01) F01D 5/08 (2006.01) F01D 5/30 (2006.01)

Patent

CA 1209482

- 18 - Abstract Two Stage Rotor Assembly With Improved Coolant Flow A spacer extends between and engages the rear face of a first disk and front face of a second disk of co-rotating rotors of a two stage turbine. The spacer engages the disks radially inwardly of the blade root slots of each disk and defines an inter- mediate cooling air compartment between the disks, radially inward of the spacer. Each disk includes blade root slots, each having a blade root disposed therein and defining a cooling air passageway across each slot from the front to rear face of each disk. Cooling air from a compartment upstream of the first disk is directed downstream through the passageways across the slots and thence radially inwardly into the intermediate compartment between the disks. From the intermediate compartment the cooling air travels radially outwardly and then axially through the cooling air passageways across the second disk blade root slots. Thus, the same mass of cooling air from upstream of the first disk is used to cool the rims of both disks and the blade roots disposed in the slots of both disks without the air having to pass through axial holes through the first disk, thereby eliminating the need for such holes and increasing the strength of the disk. In a preferred embodiment a portion of the cooling air passing through the slots of each disk is directed radially outwardly into hollow airfoils which are integral with the blade roots.

467057

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