Abstract
Partial admission has been applied to the control stage of steam turbine because it produces high turbine efficiency at low loads. The shock load caused by partial admission generates excitation force on a blade, and the vibratory stress of the blade may become a cause of HCF (High Cycle Fatigue). Therefore, in designing a control stage blade of steam turbine, the vibratory stress caused by partial admission should be exactly predicted. Recently, ISB (Integral Shroud Blade) structure has been applied to not only the low-pressure end blade but also the control stage blade of steam turbine. Because the traditional analysis method based on experiments can predict only the vibratory stress of the grouped blade structure, it is indispensable to develop the general analysis method of vibratory stress caused by shock load, which can be applied to both of the grouped blade and ISB structure. This paper, first, presents the analysis method for the grouped blade and ISB structure to calculate the vibratory stress caused by partial admission. Second, the vibration response characteristics to shock load is explained, using some calculated results of simplified blade models. Finally, the response analysis is carried out for the actual grouped blade and ISB structure, and the results are evaluated from the viewpoint of blade reliability.
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