Research on the Flow Characteristics and Static Stability of the Tapered Annular Seal

被引：0
|
作者：
Zhang W. [1 ]
Chen L. [1 ]
Pan B. [2 ]
Gu Q. [1 ]
Yang J. [3 ]
Li C. [1 ]
机构：
[1] School of Energy and Power Engineering, University of Shanghai for Science and Technology, Yangpu District, Shanghai
[2] Xi'an Thermal Power Research Institute Co., Xi'an, 710054, Shaanxi Province
[3] National Engineering Research Center of Turbo-Generator Vibration, Southeast University, Nanjing, 210096, Jiangsu Province
来源：
| 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：
Static stability; Static stiffness coefficient; Tapered seals; Turbomachinery;
D O I：
10.13334/j.0258-8013.pcsee.191345
中图分类号：
学科分类号：
摘要：
Tapered annular seals have a key influence on the dynamic stability of the rotor system. This paper set up a numerical model for the various seals. The flow characteristics of the seal in the case of choked or subsonic flow with different eccentricities were calculated. The influence of the tapered coefficient on the static stability, leakage and the formation mechanism of the static instability of the tapered annular seal were analyzed. Results show that the direct static stiffness of the divergent annular seal is negative, and the seal is statically unstable in the choked/subsonic flow. The constant-clearance seal had a negative static stiffness coefficient in the choked flow, and it had a negative stiffness in the subsonic flow only under the high eccentricity. The fluid-induced force and the direct static stiffness coefficient of the convergent annular seal are almost positive in the choked/subsonic flow. The negative circumferential velocity gradient in the minimum clearance of the tapered annular seal is large. The resulting viscous effect reduces the pressure in the minimum clearance and creates a negative direct static stiffness coefficient, resulting in static instability of the tapered annular seal. The leakage flowrate of the tapered seal increases with the increasing eccentricity. © 2020 Chin. Soc. for Elec. Eng.
引用
收藏
页码：3241 / 3249
页数：8
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