基于阻抗法的密封动力特性系数实验识别

张万福; 王应飞; 张晓斌; 杨兴辰; 李春

doi:10.7527/S1000-6893.2020.24719

航空学报 >

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

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

材料工程与机械制造

基于阻抗法的密封动力特性系数实验识别

张万福 ,
王应飞 ,
张晓斌 ,
杨兴辰 ,
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. 上海市动力工程多相流动与传热重点实验室, 上海 200093;
3. 华北电力科学研究院有限责任公司, 北京 100045

收稿日期: 2020-09-04

修回日期: 2020-12-15

网络出版日期: 2020-12-14

基金资助

国家自然科学基金（51875361）；上海市自然科学基金（20ZR1439200）

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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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摘要

搭建并优化了密封动力特性系数实验识别装置，应用阻抗法对梳齿密封动力特性系数开展实验识别，研究转速、进口压力和涡动频率对密封动力特性系数的影响。应用基于微元理论的密封动力特性系数识别方法对密封动力学特性进行了数值计算分析，与实验结果进行对比分析。结果表明：实验识别梳齿密封动力特性系数整体上略高于数值计算结果，但趋势上吻合良好，特别是表征系统稳定性的密封有效阻尼系数，数值与实验具有良好的一致性。梳齿密封动力特性系数在转子低频（<；100 Hz）涡动时存在一定的频率依赖性，高频（>100 Hz）时阻尼系数的频率依赖性较弱。实验和数值模拟均表明，相较于转速，压比的变化对密封有效阻尼系数的影响更大。

关键词： 透平机械; 梳齿密封; 动力特性系数; 阻抗法; 振动

本文引用格式

张万福 , 王应飞 , 张晓斌 , 杨兴辰 , 李春 . 基于阻抗法的密封动力特性系数实验识别[J]. 航空学报, 2022 , 43(1) : 424719 -424719 . DOI: 10.7527/S1000-6893.2020.24719

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

参考文献

[1] DENTON J D. Loss mechanisms in turbomachinery[J]. Journal of Turbomachinery, 1993, 115(4): 621-656.
[2] CHUPP R E, HENDRICKS R C, LATTIME S B, et al. Sealing in turbomachinery[J]. Journal of Propulsion and Power, 2006, 22(2): 313-349.
[3] CHILDS D W. Turbomachinery rotordynamics: Phenomena, modeling, and analysis[M]. New York: John Wiley & Sons, Inc., 1993.
[4] CHILDS D W, NELSON C E, NICKS C, et al. Theory versus experiment for the rotordynamic coefficients of annular gas seals: Part 1—Test facility and apparatus[J]. Journal of Tribology, 1986, 108(3): 426-431.
[5] TIWARI R, MANIKANDAN S, DWIVEDY S K. A review of the experimental estimation of the rotor dynamic parameters of seals[J]. Shock and Vibration Digest, 2005, 37(4): 261-284.
[6] BLACK H F, JENSSEN D N. Dynamic hybrid properties of annular pressure seals[C]//Proceedings of IMechE, 1969:92-100.
[7] NORDMANN R, MASSMANN H. Estimation of stiffness, damping and mass coefficients of annular seals[C]//Proceedings of the 3rd International Conference on Vibration in Rotating Machinery, IMechE, 1984.
[8] BENCKERT H, WACHTER J. Flow induced spring coefficients of labyrinth seals for application in rotor dynamics[C]//NASA Conference Publication 2133: Rotordynamic Instability Problems in High-Performance Turbomachinery. Washington, D.C.: NASA, 1980.
[9] RAJAKUMAR C, SISTO F. Experimental investigations of rotor whirl excitation forces induced by labyrinth seal flow[J]. Journal of Vibration and Acoustics, 1990, 112(4): 515-522.
[10] BROWN R D, ISMAIL M. Dynamic characteristics of long annular seals in centrifugal pumps[C]//Proceedings of the 5th International Conference on Vibration in Rotating Machinery, IMechE, 1992.
[11] KWANKA K. Improving the stability of labyrinth gas seals[J]. Journal of Engineering for Gas Turbines and Power, 2001, 123(2): 383-387.
[12] KWANKA K. Rotordynamic impact of swirl brakes on labyrinth seals with smooth or honeycomb[C]//Proceedings of the ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition, 1997: V4T-V14T.
[13] DARDEN J M, EARHART E M, FLOWERS G T. Comparison of the dynamic characteristics of smooth annular seals and damping seals[J]. Journal of Engineering for Gas Turbines and Power, 2001, 123(4): 857-863.
[14] DARDEN J M, EARHART E M, FLOWERS G T. Experimental rotordynamic characterization of annular seals: Facility and methodology[J]. Journal of Engineering for Gas Turbines and Power, 1999, 121(2): 349-354.
[15] WAGNER N G. Reliable rotor dynamic design of high-pressure compressors based on test rig data1[J]. Journal of Engineering for Gas Turbines and Power, 2001, 123(4): 849-856.
[16] CHILDS D W, SCHARRER J K. Experimental rotordynamic coefficient results for teeth-on-rotor and teeth-on-stator labyrinth gas seals[J]. Journal of Engineering for Gas Turbines and Power, 1986, 108: 559-604.
[17] VANCE J M, SHULTZ R R. A new damper seal for turbomachinery[C]//Proceedings of the 14th Biennial ASME Conference on Vibration and Noise, 1993:139-148.
[18] DAWSON M P, CHILDS D W, HOLT C G, et al. Measurements versus predictions for the dynamic impedance of annular gas seals-Part I: Test facility and apparatus[J]. Journal of Engineering for Gas Turbines and Power, 2002, 124(4): 958-962.
[19] HOLT C G, CHILDS D W. Theory versus experiment for the rotordynamic impedances of two hole-pattern-stator gas annular seals[J]. Journal of Tribology, 2002, 124(1): 137-143.
[20] CHILDS D W, WADE J. Rotordynamic-coefficient and leakage characteristics for hole-pattern-stator annular gas seals-measurements versus predictions[J]. Journal of Tribology, 2004, 126(2): 326-333.
[21] WEATHERWAX M, CHILDS D W. Theory versus experiment for the rotordynamic characteristics of a high pressure honeycomb annular gas seal at eccentric positions[J]. ASME Journal of Tribology, 2003, 125(2): 422-429.
[22] ERTAS B H, GAMAL A, VANCE J. Rotordynamic force coefficients of pocket damper seals[J]. Journal of Turbomachinery, 2006, 128(4): 725-737.
[23] ERTAS B H, DELGADO A, VANNINI G. Rotordynamic force coefficients for three types of annular gas seals with inlet preswirl and high differential pressure ratio[J]. Journal of Engineering for Gas Turbines and Power, 2012, 134(4): 42501-42503.
[24] 沈庆根,郑水英. 迷宫密封气流激振的试验研究和稳定性分析[J]. 流体工程, 1990(1): 1-8. SHEN Q G, ZHENG S Y. Experimental study and stability analysis of airflow excited vibration of labyrinth seal[J]. Fluid Engineering, 1990(1): 1-8(in Chinese).
[25] 郑水英,沈庆根. 迷宫密封流体激振消振措施的研究[J]. 化工机械, 1998(2): 16-21. ZHENG S Y, SHEN Q G. Study on the measures of vibration excitation and vibration reduction of labyrinth seal[J]. Chemical Engineering & Machinery, 1998(2): 16-21(in Chinese).
[26] 王炜哲,刘应征,叶春,等. 迷宫密封—转子系统动力学特性的试验测量和数值模拟[J]. 机械工程学报, 2007, 43(3): 22-27. WANG W Z, LIU Y Z, YE C, et al. Experimental measurement and numerical simulation of dynamics of labyrinth seal-rotor combination[J]. Journal of Mechanical Engineering, 2007, 43(3): 22-27(in Chinese).
[27] 何立东,诸振友,闻雪友,等. 密封间隙气流振荡流场的动态压力测试[J]. 热能动力工程, 1999(1): 42-44. HE L D, ZHU Z Y, WEN X Y, et al. Dynamic pressure test of the oscillating flow field of air flow in a sealed gap[J]. Journal of Engineering for Thermal Energy and Power, 1999(1): 42-44(in Chinese).
[28] 曹浩,杨建刚,张万福,等. 基于不平衡同频激励的密封动力特性系数识别[J]. 中国电机工程学报, 2011,31(35): 117-122. CAO H, YANG J G, ZHANG W F, et al. Experimental identification method using unbalance synchronous frequency excitation for seals rotordynamic coefficients analysis[J]. Proceedings of the CSEE, 2011,31(35): 117-122(in Chinese).
[29] 孙丹,杨建刚,曹浩,等. 密封气流力试验识别方法及影响因素研究[J]. 中国电机工程学报, 2011,31(5): 96-100. SUN D, YANG J G, CAO H, et al. Analysis on the experimental identification of seal force and its influence factors[J]. Proceedings of the CSEE, 2011,31(5): 96-100(in Chinese).
[30] 张万福,杨建刚,曹浩,等. 偏心密封内切向气流力及其对稳定性影响的理论与试验研究[J]. 机械工程学报, 2011,47(17): 92-98. ZHANG W F, YANG J G, CAO H, et al. Theoretical and experimental research of tangential fluid-induced force and its influence on stability in eccentric seal[J]. Journal of Mechanical Engineering, 2011,47(17): 92-98(in Chinese).
[31] 孙丹,王猛飞,艾延廷,等. 蜂窝密封泄漏特性理论与实验[J]. 航空学报, 2017, 38(4): 277-286. SUN D, WANG M F, AI Y T, et al. Theoretical and experimental study of leakage characteristics of honeycomb seal[J]. Acta Aeronautica et Astronautica Sinica, 2017, 38(4): 277-286(in Chinese).
[32] 马凯,张万福,张尧,等. 梳齿密封静态稳定性理论与实验研究[J]. 振动与冲击, 2019, 38(20): 140-147. MA K, ZHANG W F, ZHANG Y, et al. Theoretical and experimental study on the static stability of labyrinth seals[J]. Journal of Vibration and Shock, 2019, 38(20): 140-147(in Chinese).
[33] ZHANG W F, GU Q, YANG J G, et al. Application of a novel rotordynamic identification method for annular seals with arbitrary elliptical orbits and eccentricities[J]. Journal of Engineering for Gas Turbines and Power, 2019, 141(9): 091016.

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