Low-frequency vibration characteristic of gas bearing turbo-refrigerator

doi:10.3969/j.issn.0438-1157.2012.z2.034

CIESC Journal ›› 2012, Vol. 63 ›› Issue (S2): 181-186.DOI: 10.3969/j.issn.0438-1157.2012.z2.034

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Low-frequency vibration characteristic of gas bearing turbo-refrigerator

ZHAO Chen^1,2, YANG Jinfu¹, HAN Dongjiang^1,2, QI Weijun³, CHEN Changting^1,2

1. Institute of Engineering Thermo Physics, Chinese Academy of Sciences, Beijing 100190, China;
2. Graduate University of Chinese Academy of Sciences, Beijing 100039, China;
3. School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China

Received:2012-09-21 Revised:2012-09-28 Online:2012-12-28 Published:2012-12-28
Supported by:
supported by the Key Projects in the National Science & Technology Pillar Program(2012BAA11B02).

气体轴承透平膨胀制冷机的低频振动特性

赵晨^1,2, 杨金福¹, 韩东江^1,2, 齐伟军³, 陈昌婷^1,2

1. 中国科学院工程热物理研究所, 北京 100190;
2. 中国科学院研究生院, 北京 100039;
3. 华北电力大学能源动力机械工程学院, 北京 102206

通讯作者: 赵晨
作者简介:赵晨(1988-),女,硕士研究生。
基金资助:
国家科技支撑计划项目(2012BAA11B02)。

Abstract

Abstract: Experimental studies on low-frequency vibration,which are apt to happen on the gas bearing turbo-expander in the air refrigerator system for the airplanes,are carried out in this paper.Tests are conducted at various journal bearing supply pressure and run-rate to research the characteristics of low-frequency vibration i.e.gas-film whirl and gas-film whip.The experimental results verify the impact of low-frequency vibration on stability,and appropriate bearing supply pressure and run-rate can abate and eliminate the low-frequency vibration.More importantly,the results reveal the relationship between low-frequency vibration and the mechanical efficiency of rotor-bearing system,and an effective calculation equation is proposed.

Key words: gas bearings, turbo-refrigerator, low-frequency vibration

摘要： 针对气体轴承结构的某航空用空气透平膨胀机出现的低频振动现象,进行了不同轴承供气压力与升速率下的转子低频振动特性试验研究。通过分析不同参数下转子的气膜涡动和气膜振荡特性,证实了低频振动对转子运动行为及失稳的影响,在合适的供气压力和升速率下低频振动可以得到有效的抑制和消除。揭示了转子低频振动与系统机械效率之间的关系,并提出了一种计算低频振动耗能的方法。

关键词: 气体轴承, 透平膨胀制冷机, 低频振动

CLC Number:

TH113.1
TK14

ZHAO Chen, YANG Jinfu, HAN Dongjiang, QI Weijun, CHEN Changting. Low-frequency vibration characteristic of gas bearing turbo-refrigerator[J]. CIESC Journal, 2012, 63(S2): 181-186.

赵晨, 杨金福, 韩东江, 齐伟军, 陈昌婷. 气体轴承透平膨胀制冷机的低频振动特性[J]. 化工学报, 2012, 63(S2): 181-186.

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Low-frequency vibration characteristic of gas bearing turbo-refrigerator

气体轴承透平膨胀制冷机的低频振动特性

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