ガスタービン起動/停止時における初段動翼の温度挙動 : 翼内外の熱流動場の過渡連成解析(熱工学,内燃機関,動力など)

概要

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In order to contribute to the life assessment of the first stage rotor blade of a power generation gas turbine, analysis of transient temperature distribution at start-up and shutdown including an emergency trip were conducted by thermal conjugation inside and outside the blade. Characteristic diagrams simulating an plant were used for the numerical predictions. The distinctive features of the temperature distribution of the blade were predicted in each operation process. Those were influenced by the characteristics of the heat transfer, varying with the operation load range. The temperature distribution of the blade remained similar in the operation for over half load. In the operation at half and no-load conditions, especially in the emergency stop process, the feature of the temperature distribution markedly changed owing to unsteadiness of the heat conduction inside the blade. The present predictions of the transient distributions of the blade temperature made it possible to put the analytical life assessment of the gas turbine blade into practice.
2003-04-25