IGTC-80 Design and Test of an Air-Cooled Ceramic Nozzle for a Power Generating Gas Turbine(Session C-9 EVALUATION OF CERAMIC COMPONENTS III)

概要

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The trial to apply ceramics to the first stage nozzle vanes of a 1500℃ class gas turbine has been carried out. The temperatures of ceramic nozzle vanes were estimated to exceed the tolerance temperature level, therefore the utilization of a small amount of a cooling air has been studied to reduce the temperatures of the ceramic nozzle vanes. The inner face of the nozzle is cooled by air impingement and this air is discharged and mixed into the main gas flow through cooling slits located at the trailing edge of the nozzle. A series of cascade tests were carried out for the designed air-cooled Si_3N_4 nozzle vanes under intermediate pressure (6ata) and 1500℃ conditions. After these tests, full pressure (13.5ata) tests were conducted at an average temperature of 1500℃. They were included both steady state and transients of emergency shutdown. This paper will present the results of these cascade tests.
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