The Advanced Thermally Actuated Clearance Control System underwent several studies. Improved flow path isolation quantified what can be gained by making the HPT case nearly adiabatic. The best method of heat transfer was established, and finally two different borrowed air cooling circuits were evaluated to be used for the HPT Active Clearance Control System. Glenn Research Center NASA/CR-2008-215234, E-16493 NAS3-01135; WBS 984754.02.07.03.11.03 GAS TURBINE ENGINES; ACTUATORS; ACTIVE CONTROL; CONTROL SYSTEMS DESIGN; AIRCRAFT CONTROL; HEAT TRANSFER; ISOLATION; FLANGES; IMPINGEMENT; AIR COOLING
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