Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method

ZHANG Wanfu; WANG Yingfei; ZHANG Xiaobin; YANG Xingchen; LI Chun

doi:10.7527/S1000-6893.2020.24719

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2022 , Vol. 43 >Issue 1: 424719 - 424719

DOI: https://doi.org/10.7527/S1000-6893.2020.24719

Material Engineering and Mechanical Manufacturing

Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method

ZHANG Wanfu ,
WANG Yingfei ,
ZHANG Xiaobin ,
YANG Xingchen ,
LI Chun

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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. North China Electric Power Research Institute Co., Ltd., Beijing 100045, China

Received date: 2020-09-04

Revised date: 2020-12-15

Online published: 2020-12-14

Supported by

National Natural Science Foundation of China (51875361); Natural Science Foundation of Shanghai (20ZR1439200)

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Abstract

An experimental facility is established and improved to identify rotordynamic coefficients of the labyrinth seal. The impedance method is employed to identify the rotordynamic coefficient of the labyrinth seal. Effects of rotational speed, inlet pressure and whirling frequency on the dynamic characteristics are studied. The identification method for the dynamic characteristics of the seal based on the infinitesimal theory is applied for numerical analysis of the experimental seal. Results of numerical analysis are compared with the experimental results. The comparison shows that the rotordynamic characteristics of the labyrinth seal identified from the experiment are slightly higher than those from numerical analysis, but their varying trends are in good agreements. Particularly, the results of the effective damping coefficient, which characterizes the stability of the system, has good consistency. The dynamic coefficient of the labyrinth seal shows a frequency dependence when the rotor whirls at low frequencies (<100 Hz), and the frequency dependence is weak at high frequencies (>100 Hz). Both experiments and numerical simulations show that compared with rotational speed, pressure ratio has a greater impact on the effective damping coefficient of the labyrinth seal.

Key words： turbomachinery; labyrinth seal; rotordynamic coefficient; impedance method; vibration

Cite this article

ZHANG Wanfu , WANG Yingfei , ZHANG Xiaobin , YANG Xingchen , LI Chun . Experimental identification for rotordynamic coefficients of labyrinth seal based on impedance method[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2022 , 43(1) : 424719 -424719 . DOI: 10.7527/S1000-6893.2020.24719

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