The Harmonic Excitation Mechanical Impedance Method for the Measurements of Rotordynamic Characteristics of Rotating Seals

被引：0
作者：
Fang Z. [1 ]
Li Z. [1 ]
Wang T. [1 ]
Xue W. [1 ]
Li J. [1 ]
机构：
[1] School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an
来源：
Hsi-An Chiao Tung Ta Hsueh/Journal of Xi'an Jiaotong University | 2022年 / 56卷 / 06期
关键词：
Harmonic excitation; Mechanical impedance method; Rotating seal; Rotordynamic characteristics; Test rig;
D O I：
10.7652/xjtuxb202206011
中图分类号：
学科分类号：
摘要：
The development of the domestic advanced rotating seals technology is limited due to the lack of detailed experimental researches and reliable high-precision test rig. Therefore, in this paper, a high-precision rotordynamic characteristic test rig for rotating seals were built, and it is based on the wave excitation mechanical impedance method. The test rig includes five systems: air supply system, drive system, lubrication system, excitation system, and measurement system. During the test, two electromagnetic shakers were utilized to apply the single frequency or multi frequency harmonic excitation on the stator in both orthogonal (x- and y-) directions, and the force excitation signal, the response displacement and accelerated speed were synchronously measured, which can be used to finally solve force-displacement linear equation through the mechanical impedance of the uncompressed-gas benchmark decoupling test rig and the flow impedance of rotating seals and obtain the frequency-dependent rotordynamic characteristic coefficients of rotating seals. Utilizing the test rip, the frequency-dependent rotordynamic characteristic coefficients of rotating seals can be obtained under different operating conditions (including the inlet and outlet pressure ratio, rotational speed, inlet swirl speed, and eccentricity ratio), different sealing structures (non-contact rotating seals such as labyrinth seals, hole-pattern/honeycomb seals, and pocket seals) and different sealing clearances. In this paper, the detailed structure, measuring instrument and experimental principle of the test rig were described, and the leakage and rotordynamic characteristic were measured for a typical labyrinth seal which confirmed the feasibility and accuracy of the test rig. © 2022, Editorial Board of Journal of Xi'an Jiaotong University. All right reserved.
引用
收藏
页码：85 / 96
页数：11
相关论文
共 28 条
  • [1] CHUPP R E, HENDRICKS R C, LATTIME S B, Et al., Sealing in turbomachinery, Journal of Propulsion and Power, 22, 2, pp. 313-349, (2006)
  • [2] CAO Shuqian, CHEN Yushu, A review of modern rotor/seal dynamics, Journal of Engineering Mechanics, 26, pp. 68-79, (2009)
  • [3] ALFORD J S., Protecting turbomachinery from self-excited rotor whirl, Journal of Engineering for Power, 87, 4, pp. 333-343, (1965)
  • [4] LI Jun, YAN Xin, FENG Zhenping, Et al., State-of-the art of turbomachinery damper seals technology and their rotordynamic characteristics, Thermal Turbine, 38, 1, pp. 5-9, (2009)
  • [5] LUO Mingwen, DING Xuejun, QI Xiaobo, Et al., The status quo and prospect concerning a study on steam flow excitations in large-sized steam turbines, Journal of Engineering for Thermal Energy and Power, 21, 6, pp. 551-555, (2006)
  • [6] ZHANG Xueyan, WANG Yanbo, ZHANG Weijun, Analysis and countermeasures of steam-excited vibration of supercritical pressure steam turbine, Electric Power, 35, 12, pp. 1-6, (2002)
  • [7] ZHANG Xueyan, WANG Yanbo, ZHANG Weijun, Analysis and treatment for problem concerning steam flow exciting vibration on domestic large-scale steam turbines, Thermal Power Generation, 33, 2, pp. 47-55, (2004)
  • [8] JING Jianping, MENG Guang, ZHAO Mei, Et al., Survey and outlook on the research o of the steam excitation of superior ultra-critical steam turbine, Turbine Technology, 46, 6, pp. 405-407, (2004)
  • [9] NELSON C C., Analysis for leakage and rotordynamic coefficients of surface-roughened tapered annular gas seals, Journal of Engineering for Gas Turbines and Power, 106, 4, pp. 927-934, (1984)
  • [10] HA T W, CHILDS D W., Annular honeycomb-stator turbulent gas seal analysis using a new friction-factor model based on flat plate tests, Journal of Tribology, 116, 2, pp. 352-359, (1994)
123