Development and Reliability Evaluation of a Ceramic Stator Vane for Industrial Gas Turbines
A ceramic gas turbine is expected to improve the thermal efficiency of a power plant, especially in a combined cycle. The first stage ceramic stator vane is developed for a 1300°C class, 20-MW industrial gas turbine. There are two main design objectives. One is a structural design to ensure the strength reliability of brittle ceramic parts. The other is a cooling and heat insulating design to reduce the cooling air amount of metal parts. To solve the above problems, these ceramic stator vanes have a hybrid structure, composed of ceramic, metal and heat insulating parts. The strength reliability and cooling properties of the ceramic stator vane are evaluated by a cascade test using combustion gas in actual conditions (1300°C, 1.5 MPa). The results prove that ceramic parts have good strength reliability. Also, 1/20th the amount of cooling air required for air-cooled conventional vanes is required for the ceramic stator vane.
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