Temperature Behaviour of the First Stage Rotor Blade at Start-up and Shutdown of a Gas Turbine : Transient Analysis of Conjugate Heat Transfer Inside and Outside the Blade

• Published in: Transactions of the Japan Society of Mechanical Engineers Series B Vol. 69; no. 680; pp. 995 - 1000
• Main Authors: WATANABE, Kazunori, TAKAHASHI, Toshihiko, TAKAHASHI, Takeshi
• Format: Journal Article
• Language: Japanese
• Published: The Japan Society of Mechanical Engineers 25.04.2003
• Subjects: Blade
• ISSN: 0387-5016; 1884-8346
• DOI: 10.1299/kikaib.69.995

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.