抄録
The reduction effect on the vibratory stress of the steam turbine blade is studied theoretically for the most probable asymmetric vane, in which the vane count of the upper and lower half is slightly different. The method for predicting the vibratory stress of the blade for the asymmetric spacing vane is proposed. Using the simple model of the asymmetric vane, the parametric study is carried out to clarify the influence of the blade damping, vane count etc. on the reduction effect of blade vibratory stress. The vibratory stresses are analyzed in both case of the symmetric and asymmetric spacing vane by use of the proposed method and the effect of the asymmetric spacing vane on the resonant stress is verified.
