Rotor/shroud clearance control system

Details Rotor/shroud clearance control system Rotor/shroud clearance control system

F - Mech Eng,Light,Heat,Weapons

01

D

341/106, 170/69

F01D 5/20 (2006.01) F01D 11/24 (2006.01) F02C 7/20 (2006.01)

Patent

CA 1119525

13DV-7259 ROTOR/SHROUD CLEARANCE CONTROL SYSTEM Abstract Cooling airflow to the shroud support apparatus is varied in response to both rotor speed and elapsed time above a predetermined level by the selective use and mixture of two air sources at different temperatures. For steady-state operation, each of four different operating modes has its prescribed cooling air delivery mode such that, generally, as the engine speed and cycle temperatures increase, so does that of the cooling air. For tran- sient operation, a timer is employed to sequence the desired cooling air delivery modes in such a manner as to maintain optimum rotor-to-shroud clearances during the transient period.

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