| 摘要 |
A coolant feed arrangement for delivering coolant to an axially facing surface of a rotor disc (22) which is configured for carrying a row of turbine blades (201) on its radially outer surface, the coolant delivered through a conduit (26) upstream of the rotor disc, the conduit having an outlet arranged radially inwardly of the row of turbine blades (201) and directed at the axially facing surface, the arrangement comprising two or more impediments (30,27); at least one impediment comprising a work extractor device (30) arranged in the conduit (26) to extract work from the coolant on route to a last impediment (27) arranged at or adjacent the outlet, the last impediment comprising a row of static nozzles configured for accelerating the flow of coolant circumferentially in the direction of rotation of the axially facing surface of the disc (22) whereby to match the speed and direction of rotation of the axially facing surface as the coolant is delivered to the axially facing surface. |
