Page 118 - 《摩擦学学报》2021年第1期

第 41 卷 第 1 期 摩 擦 学 学 报 Vol 41 No 1
2021 年 1 月 Tribology Jan, 2021

DOI: 10.16078/j.tribology.2020060

超临界二氧化碳高低齿梳齿密封

动力稳定性研究

1,2*
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尹 露 , 张万福 , 姜广政 , 潘 渤 , 李 春 1,2
(1. 上海理工大学 能源与动力工程学院，上海 200093;
2. 上海市动力工程多相流动与传热重点实验室，上海 200093;
3. 西安热工研究院有限公司，陕西 西安 710054)
摘 要: 建立超临界二氧化碳(supercritical carbon dioxide，SCO 2 )高低齿梳齿密封三维数值计算模型，应用基于微元
理论的密封动特性识别方法，研究凸台宽度及密封间隙对超临界二氧化碳梳齿密封动静特性的影响，并与传统梳
齿密封进行对比. 研究表明：高低齿梳齿密封的交叉复合刚度系数对有效阻尼系数影响较小，主阻尼对其占主要影
响. 在低涡动频率下(<160 Hz)，传统梳齿密封动力稳定性较好；而涡动频率高于160 Hz时，高低齿梳齿密封的有效
阻尼系数约为传统梳齿密封的105%~113%；且存在1个最佳凸台宽度使密封系统稳定性最好(本文最佳值为5.13 mm)；
随着密封间隙的减小，有效阻尼系数的大小与频率依赖性分别增大、增强. 高低齿梳齿密封泄漏量较传统梳齿密封
降低约45.5%；凸台宽度5.13 mm、密封间隙0.4 mm时较原始模型(b=4 mm、c 2 =0.5 mm)泄漏量分别降低约5%和19%，
高低齿梳齿密封泄漏量随密封间隙的减小而降低.
关键词: 高低齿梳齿密封; 计算流体力学; 超临界二氧化碳; 泄漏特性; 动力稳定性
中图分类号: TK263 文献标志码: A 文章编号: 1004-0595(2021)01–0115–10

Dynamic Stability of Staggered Labyrinth Seals with
Supercritical Carbon Dioxide

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1,2*
YIN Lu , ZHANG Wanfu , JIANG Guangzheng , PAN Bo , LI Chun 1,2
(1. School of Energy and Power Engineering, University of Shanghai for Science and
Technology, Shanghai 200093, China
2. Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering, Shanghai 200093, China
3. Xi’an Thermal Power Research Institute Co, Shaanxi Xi’an 710054, China)
Abstract: Numerical analysis model of the staggered labyrinth seal with supercritical CO 2 as working fluid was
established. The dynamic and static characteristics of the staggered labyrinth seal for different width of rotor convex
plate, clearance of seal and compared with the conventional labyrinth seal were studied based on infinitesimal theory.
Results showed that the cross-coupled complex dynamic stiffness of staggered labyrinth seals had little effect on the
effective damping coefficient, and the main damping had a major influence on it. At low whirling frequency (<160 Hz),
the conventional labyrinth seal had better dynamic stability. When the whirling frequency was higher than 160 Hz, the
effective damping coefficient of the staggered labyrinth seal was about 105% to 113% of the conventional labyrinth seal.

Received 13 April 2020, revised 27 May 2020, accepted 9 June 2020, available online 28 January 2021.
*Corresponding author. E-mail: wfzhang@usst.edu.cn, Tel: +86-18817882508.
The project was supported by the National Natural Science Foundation of China (51875361), Natural Science Foundation of
Shanghai (20ZR1439200), Science and Technology Project of China Huaneng Group Corporation (HNKJ17-H34).
国家自然科学基金项目(51875361)，上海市自然科学基金项目(20ZR1439200)和中国华能集团公司科学技术项目(HNKJ17-
H34)资助.