Leakage Flow and Dynamic Characteristics of Supercritical Carbon Dioxide Dry Gas Seals with Different Types of Grooves

被引：0

作者：

Yuan T. ^{[1
]}

Li Z.-G. ^{[1
]}

Li J. ^{[1
]}

Yuan Q. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an

来源：

Tuijin Jishu/Journal of Propulsion Technology | 2022年 / 43卷 / 09期

关键词：

Compressor; Dry gas seal; Dynamic characteristics; Dynamic mesh technology; Leakage flow; Microscale perturbation; Turbine;

D O I：

10.13675/j.cnki.tjjs.210506

中图分类号：

学科分类号：

摘要：

By aiming at the serious leakage and rotor instability problem caused by the perturbation of fluid flow in supercritical carbon dioxide(SCO2)rotating machines, four kinds of dry gas seals with spiral groove, T groove and ST groove with spiral angle 15° and 30° are designed. The 10MWe SCO2 Brayton cycle designed by GE company is chosen as the research subject. A micro-scale perturbation model based on the transformation mesh technique and unsteady CFD numerical method is used to study both the steady and unsteady dynamic characteristics of the dry gas seal at the shaft end of the SCO2 turbine under the experimental boundary conditions. The leakage flow, static film stiffness, dynamic film stiffness and damping coefficient under 3 groove thicknesses and two groove angles are compared and analyzed. The results show that the four kinds of dry gas seals all meet the design requirements of limit leakage flow. With the increase of the groove thickness, both the leakage flow and the opening force of the dry gas seal increase. ST groove dry gas seal has the relatively large film stiffness and stiffness-leakage ratio. Besides, it’s the most stable one when facing the axial microscale perturbation. Thus, the ST groove dry gas seal is comprehensively the best dry gas seal among the four. © 2022 Journal of Propulsion Technology. All rights reserved.

引用

共 24 条

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