转子倾斜对交错式迷宫密封动静特性的影响

王应飞; 张万福; 潘渤; 李春

doi:10.7527/S1000-6893.2020.23782

航空学报 >

2020 , Vol. 41 >Issue 11: 123782 - 123782

DOI: https://doi.org/10.7527/S1000-6893.2020.23782

流体力学与飞行力学

转子倾斜对交错式迷宫密封动静特性的影响

王应飞 ,
张万福 ,
潘渤 ,
李春

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1. 上海理工大学能源与动力工程学院, 上海 200093;
2. 西安热工研究院有限公司, 西安 710054

收稿日期: 2019-12-30

修回日期: 2020-01-14

网络出版日期: 2020-02-21

基金资助

国家自然科学基金（51875361）；中国华能集团公司科学技术项目（HNKJ17-H34）

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Effect of shaft misalignment on dynamic and static characteristics of interlocking labyrinth seals

WANG Yingfei ,
ZHANG Wanfu ,
PAN Bo ,
LI Chun

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1. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. Xi'an Thermal Power Research Institute Co., LTD, Xi'an 710054, China

Received date: 2019-12-30

Revised date: 2020-01-14

Online published: 2020-02-21

Supported by

National Natural Science Foundation of China (51875361); Science and Technology Project of China Huaneng Group Corporation (HNKJ17-H34)

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摘要

建立了交错式迷宫密封数值分析模型，并通过基于微元理论的密封动力特性系数理论识别方法研究了转子倾斜对密封动静特性的影响。结果表明：转子倾斜可降低交错式迷宫密封泄漏量，倾斜角为0.6°时泄漏量降低约2.5%，且进出口压比越大，效果越显著；转子倾斜带来的交错式密封腔室几何形状与齿径向间隙变化使得腔室在周向存在压力分布不均，且随倾斜角增加而增大；密封各腔室对系统稳定性影响规律不同，与交错式迷宫密封腔室的几何特性有关，密封腔室进口靠近转子、出口远离转子的腔室局部出现逆转动方向的速度场，能提高密封系统稳定性，而密封腔室进口远离转子、出口靠近转子的腔室则降低系统稳定性；整个密封段的有效阻尼随倾斜角增大而增大，转子在密封段中心倾斜不会降低交错式迷宫系统的稳定性。

关键词： 交错式迷宫密封; 计算流体力学; 动力特性; 泄漏特性; 转子倾斜

本文引用格式

王应飞 , 张万福 , 潘渤 , 李春 . 转子倾斜对交错式迷宫密封动静特性的影响[J]. 航空学报, 2020 , 41(11) : 123782 -123782 . DOI: 10.7527/S1000-6893.2020.23782

Abstract

A numerical analysis model of the Interlocking Labyrinth Seal (ILS) is established to study the effect of shaft misalignment on the rotordynamic performance of the ILS. The rotordynamic identification method based on infinitesimal theory and computational fluid dynamics method are employed to obtain the static and dynamic characteristics. Results show that the shaft misalignment could reduce the leakage of the ILS, for instance, by approximately 2.5% at the misalignment angle of 0.6°, and that higher-pressure ratios lead to more significant effect. The geometric deformation of the ILS chambers caused by shaft misalignment and the radial clearance changes of the teeth result in uneven distribution of the chamber pressure at the circumferential direction, and the pressure also increases with the growing tilt angle. The effect of each chamber in the ILS on the stability of the system is different, which is related to the cavity geometry of the ILS. The cavity with the inlet close to and the outlet away from the rotor improves the system stability since its locally existing flow field is opposite to the direction of rotation. Otherwise, the stability will be reduced. The effective damping of the entire ILS increases as the misalignment angle increases. Shaft misalignment at the center of the seal section appears not to reduce the stability of the ILS.

Key words： interlocking labyrinth seal; computational fluid dynamics; dynamic characteristics; leakage characteristics; shaft misalignment

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