基于阻抗法的密封动力特性系数实验识别

doi:10.7527/S1000-6893.2020.24719

Abstract

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

CLC Number:

V232.9

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.

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

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