Seal Dynamic Characteristics of Rotor Nonlinear Whirl in Supercritical Carbon Dioxide Turbine

被引：0
作者：
Si H. [1 ]
Cao L. [1 ]
Chen D. [1 ]
Li P. [1 ]
机构：
[1] School of Energy and Power Engineering, Northeast Electric Power University, Jilin Province, Jilin
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2023年 / 43卷 / 12期
关键词：
dynamic characteristics; gas flow excited vibration; nonlinear whirl; seal; supercritical carbon dioxide;
D O I：
10.13334/j.0258-8013.pcsee.213295
中图分类号：
学科分类号：
摘要：
Supercritical carbon dioxide turbine seal has strong aerodynamic characteristics and nonlinear rotor motion characteristics. The nonlinear rotor-seal whirl model is constructed through Fluent user-defined functions and fourth-order Runge Kutta; the coupled solution of nonlinear rotor dynamics and seal flow field is realized to explore the influence of seal aerodynamic action on rotor motion. The seal dynamic characteristics of rotor free whirl under the gas exciting force are obtained. The action process of seal gas flow excited vibration on rotor instability is revealed. The results show that the unbalanced mass force and the elastic recovery force of rotor can cause the rotor arc spiral motion. The gas dynamic pressure of seal causes the lateral offset of rotor. The exciting force of seal gas flow presents a banded distribution, and an obvious amplitude at the working speed is formed. The dynamic coefficients fluctuate greatly at the working speed. Unbalanced mass force and seal gas flow exciting force make the seal effective damping lower, which is conducive to the motion instability. ©2023 Chin.Soc.for Elec.Eng. 4669.
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页码：4669 / 4677
页数：8
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