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.

引用

页码：4669 / 4677

页数：8

共 33 条

[1]

LEE S, GURGENCI H, A comparison of three methodological approaches for meanline design of supercritical CO<sub>2</sub> radial inflow turbines[J], Energy Conversion and Management, 206, (2020)

[2]

YUAN Haomin, PIDAPARTI S, WOLF M, Numerical modeling of supercritical carbon dioxide flow in see-through labyrinth seals[J], Nuclear Engineering and Design, 293, pp. 436-446, (2015)

[3]

XIE Yonghui, WANG Yuqi, ZHANG Di, Review on research of supercritical carbon dioxide brayton cycle and turbomachinery[J], Proceedings of the CSEE, 38, 24, pp. 7276-7286, (2018)

[4]

ZHANG Wanfu, CHEN Luqi, PAN Bo, Research on the flow characteristics and static stability of the tapered annular seal[J], Proceedings of the CSEE, 40, 10, pp. 3241-3250, (2020)

[5]

DING Xuejun, LIU Shun, HUANG Lai, Numerical calculation on flow field of diaphragm seals and steam-exciting in 600MW steam turbine[J], Turbine Technology, 52, 5, pp. 348-350, (2010)

[6]

ZHANG Yao, ZHANG Wanfu, GU Qianlei, Research on suppression method for circumferential flow and fluid-induced vibration of blade tip seal[J], Journal of Vibration and Shock, 39, 10, pp. 228-233, (2020)

[7]

SUN Dan, WANG Xudong, LI Shengyuan, Numerical method study on rotordynamic characteristics of turbine machinery dynamic seals [J], Journal of Propulsion Technology, 39, 8, pp. 1829-1840, (2018)

[8]

Peng XIA, Zhansheng LIU, Xiangyu YU, A transient bulk flow model with circular whirl motion for rotordynamic coefficients of annular seals[J], Chinese Journal of Aeronautics, 31, 5, pp. 1085-1094, (2018)

[9]

Zhigang LI, Jun LI, Xin YAN, Multiple frequencies elliptical whirling orbit model and transient RANS solution approach to rotordynamic coefficients of annual gas seals prediction[J], Journal of Vibration and Acoustics, 135, 3, (2013)

[10]

Zhigang LI, Jun LI, Zhenping FENG, Comparisons of rotordynamic characteristics predictions for annular gas seals using the transient computational fluid dynamic method based on different single-frequency and multifrequency rotor whirling models[J], Journal of Tribology, 138, 1, (2016)

← 1 2 3 4 →