Experimental Investigation on Stability of Multi-Decked Protuberant Foil Gas Journal Bearing

doi:10.7652/xjtuxb201403015

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Experimental Investigation on Stability of Multi-Decked Protuberant Foil Gas Journal Bearing

更新时间：2025-04-29

- Experimental Investigation on Stability of Multi-Decked Protuberant Foil Gas Journal Bearing
- Vol. 48, Issue 3, Pages: 79-83(2014)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201403015
  CLC： TH117.1
- Online First：10 March 2014，
  
  Published：2014
- 稿件说明：
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Experimental Investigation on Stability of Multi-Decked Protuberant Foil Gas Journal Bearing[J]. 2014, 48(3): 79-83.
DOI：

Experimental Investigation on Stability of Multi-Decked Protuberant Foil Gas Journal Bearing[J]. 2014, 48(3): 79-83. DOI： 10.7652/xjtuxb201403015.

摘要

为了保证轴承支承高速转子的稳定运行

提出了一种具有多层弹性支承结构的新型箔片动压气体轴承。该轴承采用两层或多层具有鼓泡状凸起阵列的金属箔片作为弹性支承结构

通过调整鼓泡阵列的周向和轴向截距或调整上下层弹性箔片布置

可以实现轴承支承刚度特性和阻尼特性的调节。在直径为25 mm主轴的高速(10万r/min)透平膨胀机上

实验研究了这种箔片轴承支承高速转子的运转特性

详细分析了3种典型排列方式下转速与压力的关系

以及高速转子升速及降速特性。结果表明:采用不同的多层结构排列方式

可以有效调整和改善弹性箔片轴承支承高速透平转子的刚度和阻尼特性

抑制高速转子的不稳定涡动; 多层弹性箔片轴承能够产生多重刚度及多重阻尼

从而改进了传统箔片轴承刚度和阻尼的影响

改善了弹性箔片动压气体轴承的稳定性和可靠性。

Abstract

A kind of new hydrodynamic gas foil bearing with multi-decked elastic supporting structure was proposed for the stable operation of the high speed rotor supported by gas foil bearing. In this kind of foil bearing

double or multi layers of protuberant foils with projection array are adopted as the supporting structure

and the bearing stiffness and damping characteristics adjustments can be realized through changing the pitch of spherical crown in the peripheral and axial directions as well as the arrangement of the supporting foils. The experimental investigation on the high speed rotor supported by the new foil bearing was conducted on a high speed turboexpander with the rotor diameter of 25 mm. The relations between rotor speed and supply pressure

and the feature of the rotor speed-up and speed-down processes using three typical arrangement modes were analyzed. The test results show that the stiffness and damping characteristics can be adjusted and improved effectively by adopting different foil arrangement modes for the rotor supported by elastic foil bearing

and the unstable wobble can be suppressed. In addition

stiffness and damping effect in conventional gas journal bearing may be improved by introducing multiple stiffness and damping characteristics generated in the multi-decked structure of elastic foil bearing

leading to a better stability and reliability of the present hydrodynamic gas foil bearing.

关键词

Keywords

references

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