Effect of Tooth Wear on Leakage Flow Characteristics in a Labyrinth Seal

被引：0

作者：

Dai, Xinbo ^{[1
]}

Wang, Ziqi ^{[1
]}

He, Kun ^{[1
]}

Yan, Xin ^{[1
]}

机构：

[1] School of Energy & Power Engineering, Xi’an Jiaotong University, Xi’an,710049, China

来源：

Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics | 2023年 / 44卷 / 02期

关键词：

Finite element method - Fins (heat exchange) - Heat convection - Heat transfer coefficients - Kinetic energy - Kinetics - Numerical methods - Seals - Wear of materials;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The combined FEA and CFD methods were adopted to investigate the sealing performance degradations in a straight-through labyrinth seal due to wear. With the existing experimental data, the reliability and accuracy of numerical methods were validated. The geometry of worn labyrinth teeth was obtained. The effects of worn labyrinth teeth on the leakage rate and flow structures in the labyrinth seal were analyzed. The results show that, in the rubbing events, significant mushrooming damages occur in the straight-through labyrinth fins. The contact heat transfer coefficient hrot and the convective heat transfer coefficient hair have significant effects on the worn geometry of fin tip. When the incursion of rotor to fin tip is 0.4 mm, the leakage rate is increased by 82.4%. After wear, the static pressure in the cavity downstream of the worn fin tip is decreased, but the total pressure in this region is increased. In the cavity, the dissipation effect of kinetic energy is decreased after wear, leading to the increased carry-over effect in tip clearance. © 2023 Science Press. All rights reserved.

引用

页码：368 / 373