IGTC-79 Reliability of Ceramic Stator Blade Tested in Hot Wind Tunnel(Session C-9 EVALUATION OF CERAMIC COMPONENTS III)

概要

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The ceramic stator blade with new concept was designed for the experimental heavy duty gas turbine of 16MW and 1300℃ class. The stator blade consists of the ceramic vane, the metal holders supporting the ceramic vane, and the ceramic heat shield plates inserted between them. The hot wind tunnel cascade test was conducted to demonstrate the reliability of the ceramic stator blade. The test includes the two major items. One is the start up, the rated condition, and the normal shut down test. The other is the trip test from the rated condition, in which the temperature is 1300℃ and the pressure is 1.18MPa. These tests simulate the actual gas turbine conditions. In the present test, two kinds of ceramic vanes fabricated with Sialon and silicon nitride were installed into the same cascade in rainbow arrangement. In the trip tests in which the thermal stress was calculated to be high, it was verified that the stator blades were sound under thermal stress which was equivalent to the actual gas turbine. Although it was necessary to change the material for the heat shield plates, alternative CMC (ceramic matrix composite) exhibited excellent performance. In addition, the metal holder was sufficiently cooled in the predicted cooling effectiveness.
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