シュラウドでつづられたタービン翼群の連成振動に関する研究 : 第2報, 回転軸方向屈曲振動とねじり振動の干渉

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This paper presents the research on the coupled vibration of the turbine blades grouped by a shroud band. Our first report detailed a theoretical analysis concerning the effect of longitudinal and bending flexibility of shroud band on tangential flexural vibration. In this paper we deal with the interactive between axial flexural vibration and torsional vibration of turbine blade, which is occurred in an actual turbine. We have calculated the effect of the ratio of the lenght of bale to the width of that with constant thickness of shroud band on vibration behavior. In an analytical treatment, a physical model of six blades per shroud is analyzed by using the transfer matrix method. The set of six turbine blades per a shroud band is usually used in an actual turbine design. An analytical treatment for the six blades per a shroud band does not become complex, and the vibration characteristics of it can be seen clearly. The analytical treatment developed in this paper is also applicable for the case of having the other number of blades per a shroud band. It was found that the vibration characteristics of grouped blades of turbine per a shroud band largely depend on the ratio of the length to the width of turbine blade, and there is significant interference between axial flexural vibration and torsional vibration. Some results are presented in the form of parametric plots and tables.
2000-09-25