Effect of Seal Structure on Rotor Dynamic Characteristics of Steam Turbine

被引：0
|
作者：
Si H. [1 ]
Cao L. [1 ]
Li P. [1 ]
机构：
[1] School of Energy and Power Engineering, Northeast Electric Power University, Jilin, 132012, Jilin Province
来源：
Cao, Lihua (clh320@126.com) | 1600年 / Chinese Society for Electrical Engineering卷 / 40期
基金：
中国国家自然科学基金;
关键词：
Dynamic characteristics; Orthogonal test; Seal structure; Stability; Steam flow excited vibration;
D O I：
10.13334/j.0258-8013.pcsee.182234
中图分类号：
学科分类号：
摘要：
The multi-frequency whril motion for steam turbine rotor was realized by the mesh deformation technique. So the effects of seal structural parameters on rotor instability and dynamic coefficients induced by steam flow excited vibration was studied. The multi-factors effect degree of seal structural parameters on rotor stability was analyzed based on orthogonal test method. The results show that the seal teeth number, convex plates number and teeth length all affect the dynamic coefficients in frequency domain. With the increase of seal teeth number, the direct stiffness kxx increases and the direct damping cxx decreases. With the increase of convex plates number and teeth length, the direct stiffness kxx and kyy decrease, while the direct damping cxx increases with the convex plates number. The effect of seal teeth number on the rotor stability is reduced when the whirling frequency over 45Hz. The seal teeth number has little effect on the average effective damping, but the effect is greater in low frequency range. The number of convex plates, teeth length and their interaction have great effect on the rotor stability margin. The contribution rates of three factors are 31.53%, 21.51% and 23.48% respectively. Reducing the number of seal teeth or adding the convex plates is beneficial to the rotor stability of steam turbine. © 2020 Chin. Soc. for Elec. Eng.
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页码：165 / 175
页数：10
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