Static and Dynamic Characteristics of Eccentric Labyrinth Seals

被引：0

作者：

Qin P. ^{[1
]}

Zhang W. ^{[1
,2
]}

Cao H. ^{[3
]}

Yin L. ^{[1
]}

Wang Y. ^{[1
]}

Li C. ^{[1
,2
]}

机构：

[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai

[2] Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai

[3] State Grid Hunan Electric Power Company Limited Research Institute, Changsha

来源：

Mocaxue Xuebao/Tribology | 2020年 / 40卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Computational fluid dynamics (CFD); Dynamic characteristic; Labyrinth seal; Stability; Static stiffness coefficient;

D O I：

10.16078/j.tribology.2020007

中图分类号：

学科分类号：

摘要：

The three-dimensional numerical analysis model of labyrinth seals with different eccentricities was established. The identification method based on infinitesimal theory was applied to calculate the static and dynamic characteristics of the seal. The results showed that the eccentricity of the rotor reduced the leakage performance. The high point of the circumferential pressure in the seal cavity deviated from the minimum clearance with the increasing eccentricity. At low eccentricity (≤ 0.5), the static direct stiffness K and static cross-coupled stiffness k showed little variation, while the K and the absolute values of k decreased at high eccentricity (> 0.5). With the increase of eccentricity, the increase of flow viscosity effect on the minimum clearance was the main reason for the negative static direct stiffness. When the rotor whirled with an eccentricity, the stiffness coefficient and the damping coefficient showed little variation at low eccentricity(< 0.6), and the direct stiffness gradually developed to be negative with the increasing eccentricity and whirling frequency. With the increasing eccentricity, the cross-coupled stiffness was no longer equal in the orthogonal directions. The effective damping at high eccentricity (≥ 0.6) was more significantly affected by eccentricity. Copyright ©2020 Tribology. All rights reserved.

引用

页码：735 / 745

页数：10

共 25 条

[1] Denton J D., Loss mechanisms in turbomachinery, Journal of Turbomachinery, 115, pp. 621-656, (1993)
[2] Childs D W., Turbomachinery rotordynamics: Phenomena modeling and analysis, (1993)
[3] He Lidong, Xia Songbo, A brief comment on the fluid excitation of rotor seal system and vibration reduction technology, Journal of Vibration Engineering, 1, pp. 66-74, (1999)
[4] Shi Jinyuan, Yang Yu, Sun Qing, Et al., Research progress of superior ultra-critical steam turbine technology, Power Engineering, 2, pp. 2252-2257, (2003)
[5] Jing Jianping, Meng Guang, Zhao Mei, Et al., Survey and outlook on the research of the steam excitation of superior ultra-critical steam turbine, Turbine Technology, 6, pp. 405-407, (2004)
[6] Cao Shuqian, Chen Yushu, A review of modern rotor/seal dynamics, Engineering Mechanics, 26, S2, pp. 68-79, (2009)
[7] Vance J., Machinery vibration and rotordynamics, pp. 271-278, (2010)
[8] Rosenberg S S, Orlik W G, Marcenko U A., Investigating aero-dynamic transverse forces in labyrinth seals in cases involving rotor eccentricity, C E Tran 7083. Translated From Energomasinostroenie, 8, pp. 15-17, (1974)
[9] Benckert H, Wachter J., Flow induced spring constants of labyrinth seals, Proceedings of the Second International Conference on Vibrations in Rotating Machinery, pp. 53-63, (1980)
[10] Benckert H, Wachter J., Flow induced spring coefficients of labyrinth seals for application in rotor-dynamics, Proceedings of the Workshop held on Rotor-dynamic instability Problems in High Performance Turbomachinery, pp. 189-212, (1980)

← 1 2 3 →